GEOLOGICAL SURVEY CIRCULAR 301 

STRATIGRAPHIC SECTIONS OF THE 

PHOSPHORIA FORMATION IN 

IDAHO, 1947-48, PART 2 

UNITED STATES DEPARTMENT OF THE INTERIOR 

Douglas McKay, Secretary 

GEOLOGICAL SURVEY 

W. E. Wrather, Director 

GEOLOGICAL SURVEY CffiCULAR 301 

STRATIGRAPHIC SECTIONS OF THE PHOSPHORIA FORMATION 

IN IDAHO, 1947-48, PART 2 

By V. E. McKelvey, F. C. Armstrong, R. A. Gulbrandsen, and R. M. Campbell 

This report concerns work done partly on behalf,()fihe 

U.S. Atomic Energy Commission 

and is published with the permission of the Commission. 

Washingtun, D. C., 1953 

Free on application to the Geological Survey, Washington 25, D. C. 

STRATIGRAPHIC SECTIONS OF THE PHOSPHORIA FORMATION 

IN IDAHO, 1947-48, PART 2 

By V. E. McKelvey, F. C. Armstrong; R. A. Gulbrandsen, and R. M. Campbell 

CONTENTS 

Lot no. Page Lot no. Page 

Introduction ......................... 1 Tables of stratigraphic sections and 

Acknowledgments .................... 1 chemical analyses-Continued 

Stratigraphy of the Phosphoria South Rasmussen Valley .......... 1232 16 

formation in southeastern Idaho ..... 1 Spectrographic analyses ..... 19 

Stratigraphic sections ...... ; ......... 4 Trail Canyon .................... 1206 21 

References ......................... 4 Spectrographic analyses ..... 30 

Tables of stratigraphic sections and Johnson Creek .................. 1209 32 

chemical analyses Spectrographic analyses ..... 36 

North Wooley Range ............ 1230 5 South Dry Valley ................ 1211 38 

Spectrographic analyses .... 8 West Dairy ...........•......... 1208 44 

North Rasmussen Valley ........ 1233 10 Montpelier Canyon ....... 1207 and 1236 50 

Spectrographic analyses .... 14 Spectrographic analyses ..... 58. 

ILLUSTRATIONS 

Page 

Figure 1. Outcrops of the Phosphoria formation in Idaho and localities sampled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 

2. Generalized sect~on of the Phosphoria formation at Trail Canyon (lot no. 1206).................... 3 

INTRODUCTION 

The U. S. Geological Survey has measured and sampled the Phosphoria formation at many localities in Idaho 

and other western states. These data will not be fully 

synthesized and analyzed for several years, but segments 

of the data, accompanied by little or no interpretation, are 

published as preliminary reports as they are asi:iembled. 

This report, which contains abstracts of many of the sections in southeastern Idaho (fig. 1), is one of this series 

and is the second report of data gathered in Idaho during 

1947 and 1948. The field and laboratory procedures adopted 

in these investigat~ons are described rather fully in a 

companion report (McKelvey and others, 1953). 

Many people have taken part in this investigation. 

Inadditiontotheauthors, D. F. Davidson, J. A. Noel, 

F. W. O'Malley, R. L. Parker, 0. A. Payne, R. S. Sears, 

R. P. Sheldon, R. A. Smart, R. G. Waring, C. E. Weaver, 

H. Wedow, andR. A. Weeksparticipatedinth~description 

of the strata and the collection of the samples referred to 

inthisreport. D. B. Dimick, JackGeorge, W. S. Hunziker, 

J. E. Jones, H. A. Larsen, and T. K. Rigbyassistedin 

the preparation of trenches and the collection, crushing, 

and splitting of samples in the field. The laboratory preparation of samples for chemical analysis was done in 

Denver, Colo., underthedirectionofW. P. Huleatt. 

All the P zO 5, F, and acid-insoluble analyses were 

made for the Survey by the U. S. Bureau of Mines at the 

Northwest Electrodevelopment Laboratory, Albany, Oreg., 

~der the direction of S. M. Shelton and·M. L. Wright, and 

some of the spectrographic analyses were made there by 

D. M. Mortimer. TheAlz03 , Fez03 , andloss-on-ignition 

analyses were made in the Trace Elements Section laboratory of the Survey in Washington, D. C., under the direc1 

tionofJ. C. Rabbitt, bychemistsi. Barlow, J. L. Greene, 

H. Levine, H. Mela, Jr., and A. L. White, and mostQf 

the spectrographic reports were prepared in this laboratory 

byC. Annell, C. L. Waring, andH. Worthington. 

Compilation of the data has been largely by R. P. 

Sheldon and F. D. Frieske under the supervision of 

R. W. Swanson. Organization of the tabular data has bee~ 

largelyby AnitaCozzetto. 

ACKNOWLEDGMENTS 

Special thanks are due W. W. Rubey, J. Steele 

Williams, andA. E. Weissenbornwhohavegivenmuch 

advice in planning and organizing the field program. 

The cost of both the field and laboratory investigations 

has been partly borne by the Division of Raw Materials of 

the Atomic Energy Commission. 

It is a pleasure to acknowledge the fine cooperation 

extended to the field party by the local residents, property 

owners, and operating phosphate companies, who furnished 

information and services and gave access to property. 

A. J. Winter, Superintendent of the Montpelier schools; 

E. M. Norris, C. T. Russell, and L. E. Traeger of the 

Anaconda Copper Mining Co. ; D. L. King of the 

SanFranciscoChemicalCo.; andG. A. McHugh and 

H. B. FowleroftheSimplotFertilizerCo. have been 

especially helpful in this connection. 

STRATIGRAPHY OF THE PHOSPHORIA FORMATION 

IN SOUTHEASTERN IDAHO 

At its type locality in southeastern Idaho (Richards 

and Mansfield, 1912), the Phosphoria formation consists 
INDEX MAP 

(!) 

z 

:E 

0 

1243} } 1279-8~ ~ 1269 4t1 ~1263 

43o·r-------~~-------------+------------~~~34~9~·~·+-----------~:_ ____________________________ _J~ ~ 

051 

··· .. ... .. 

EXPLANATION 

Outcrop ~·f"P~ia formation 

dotted where questionable ' 

0 1233 

Location and lot number of sample 

locahty mcluded in this report 

0 1262 

Location and lot number of sample 

locality to be included in other reports 

1304 ' 

~" \ 

' 

I 

+ 

leEC.eii:I!!HI:JBB:JiHi:o&~~~c::::======l!iiii~~~c=====::::::!~o Miles 

'• ., 1266 

\1272 

I 

I 

I 

I 

I 

420 - -----~.!!.2 ______ ....._~-----l- ------------- 42 

IJJO 

Recompiled and modified from Clabaugh, 1946 1130 UTAH 

Figure 1. -Outcrops of the Phosphoria formation in Idaho and localities sampled. 

2 
FEET 

10 

.50 

200 

250 

300 

.350 

400 

NltCIIT fa eta 

20 10 0 LITHCK.CtY 

THICK• AYIIlMI "'' , ..... ll fliT PCICIIT 

DEICIUPTIOI 

Phosphoria formation 

Res ~:bert member (top Pot exposed) 

46 Chert: bard, bla~:k, tbia-beclded 

32 Naclsr.ooe: bard," black, tbia-beclclecl 

68 Chert: bard, brittle,· clark-pay to piakish-py, tbick•beclcled 

82 

Chert aad limesr.ooe: 80 per«DC bard, black, tbia·bed4ecl chert; 20 perceat bald, 

clark-pay, - .. i•e limesiDDe 

Phosphatic shale me~aber 

Phosphate cock: oolitic, bard, black, tbin-beclcled. 

(tabular) fossil fragments 

Wells foDDation 

Figure 2. -Generalized section of the Phosphoria formation at Trail Canyon (lot no. 1206). 

3 
of a lower member, the phosphatic shale, about 

180 feet thick, and an upper member, the Rex chert, 

about 240 feet thick; in most of southeastern Idaho and 

western Wyoming, however, another member, a thinbedded cherty mudstone 15 to 75 feet thick, overlies 

. the Rex chert member, though it is not well defined 

at the type locality. 

The Phosphoria formation overlies the Wells 

formation of Pennsylvanian age, and underlies the 

Dinwoody formation of Triassic age. The upper 

50 to 75 feet of the Wells formation consists of gray 

fossiliferous cherty limestone that contains some thin 

phosphatic layers. It may be the correlative of the 

lowermost member (A member) of the Phosphoria 

formation in Montana and the lower limestone 

member of the Park City formation in Utah 

(McKelvey, 1949). 

In southeastern Idaho most of the phosphatic 

beds are in the phosphatic shale member, and it is 

on this member that most of our studies have been 

·Sensitivity (percent} for 

indicated lot Element 1232 and 1206 and 1207 and 

1230 1233 1209 1236 

Al------------ p.OOOl 0.0001 0.001 0.005 

Sb------------ .001 .001 .001 .05 

As------------ .1 .1 .1 .1 

Ba-·----------- .001 .0001 .001 .08 

Be------------ .001 .0001 .001 .001 

Bi------------ .001 .001 .001 .002 

B------------ .001 .001 .001 .001 

Cd------------ .01 .01 .01 .1 

Ca----------- .0001 .001 .0001 .01 

Ce----------- .1 .1 .1 --- Cs----------- 1.0 1.0 1.0 --- Or----------- .001 .001 .001 .02 

Co----------- .001 .01 .001 .01 

Cu------------ .0001 .0001 .0001 .001 

Dy------------ .01 .01 --- --- Er------------ .01 .• 01 --- --- Eu------------ .01 .01 --- --- Gd.------------ .01 .01 --- --- Ga------------ .01 .01 --- -05- Ge------------ .001 .001 .01 .01 

Au-------~---- .01 .01 --- .01 

Hf------------ .1 .1 --- --- Ho------------ .01 .01 --- --- In------------ .001 .001 .001 --- Fe---:--------. .001 .001 .001 .005 

La----------- .01 .01 .01 --- Pb------------ .01 .01 .01 .1 

Li----------- 1*.1 * .1 --- I .2 

Lu------------ .01 .01 --- --- Mg------------ .0001 .0001 .0001 .001 

Mn------------ .001 .001 .001 .004 

• A greater sensitivity may be obtained by additional exposures. 

REFERENCES 

Clabaugh, P. S. , 1946, Permian phosphate deposits of 

Montana, Idaho, Wyoming, and Utah: U. S. Geol. Survey, 

Strategic Minerals Investigations Preliminary Map 3-198. 

McKelvey, V. E., 1949, Geological studies of the western 

phosphate field: Am. Inst. Min. Met. Eng. Mining 

Trans., v. 184, p. 270-279. 

4 

focused. It. consists of many thin layers, some of 

which persist over the whole area. They may be 

grouped into several broad units, as yet unnamed, as 

shown on figure 2. 

STRATIGRAPHIC SECTIONS 

Abstracts of stratigraphic sections measured at 

8 localities, and the available analytical data, are 

presented in the following pages. Their locations, as 

well as the locations of the sections reported previously 

(McKelvey and others, 1953) and of others to be reported 

later, are shown on figure 1. 

The semiquantitative analyses are based upon 

comparisons with a standard plate representing known 

quantities of the elements tested for and made at the 

same exposure. Greater sensitivities for many 

elements can be obtained by additional exposures. 

The standard sensitivities for the elements noted in 

this report are as follows: 

Sensitivity (percent} for 

Element indicated lot 

1232 and 1206 and 1207 and 

1230 1233 1209 1236 

Hg----------- 0.1 0.1 0.1 --- Mo----------- .001 .001 .001 0.004 

Nd----------- .01 .01 .01 --- Ni----------- .001 .001 .001 .01 

Nb----------- .01 .01 .01 .01 

P--:----------- .1 .1 .1 .8 

Pt----------- .01 .01 .01 .01 

K------------ * .1 *1.0 .0001 --- Pr----------- .01 .01 --- --- Re----------- .1 .1 .1 --- Rb-----------tLo.o 10.0 10.0 --- Sm----------- .1 .1 --- --- Sc----------- .1 .1 .1 --- Si----------- .0001 .0001 .0001 .002 

Ag----------- .001 .001 .001 .001 

Na-----·------ * .1 * .1 .0001 .05 

Sr----------- .01 .01 .01 .1 

Ta----------- .1 .1 .01 1.0 

Te----------- .1 .1 --- --- Tb----------- .1 .1 --- - --- Ti----------- .1 .1 i.o --- Th.----------- .1 .1 .1 --- Tm----------- .01 .01 --- --- Sn----------- .01 .01 .01 .01 

Ti----------- .001 .001 .001 .002 

W------------ .1 .1 .1 .1 

V------------ .01 .01 .01 .01 

Yb----------- .0001 .0001 --- --- Y------------ .001 .001 .001 --- Zn----------- .001 .01 .001 .05 

Zr----------- .001 .001 .001 .003 

McKelvey, V. E., Davidson, D. F., O'Malrey, F. W., 

and Smith, L. E., 1953, Stratigraphic sections of 

the Phosphoria formation in Idaho, 1947-48, part 1: 

U. S. Geol. Survey Circ. 208. 

Richards, R. W., and Mansfield, G. R., 1912, The 

Bannock overthrust: a major fault in southeastern 

Idaho and northeastern Utah: Jour. Geology, v. 20, 

p. 684. 
01 

NORTH WOOLEY RANGE, IDAHO. LOT NO. 1Z30. 

Phosphatic shale member of Phosphoria formation sampled in bulldozer trench on northeast limb of Wooley Valley anticline, sec. Z4, T. 6 S., 

R. 4Z E., Caribou County, Idaho. Beds strike N. 40° W. and dip 57° NE. Section measured by R. A. Hoppin, C. E. Weaver, R. L. Parker, 

R. P. Sheldon, F. W. 0' Malley, and V. E. McKelvey and sampled by J. A. Noel and R. A. Smart in July 1948. Samples analyzed for P 2o5 and ·acid 

insoluble by U.S. Bureau of Mines Laboratory, Albany, Oregon, and for other constituents by Trace Elements Section Laboratory, U. S. Geological 

"Survey, Washington, D. C. 

Bed Sample Thickness Chemical analyses {percent) Cumulative Thickness x Rock description I I ~I Loss on I Acid thickness percent P2 0 no. no. (feet) p z0 s Alz03 Fez03 ignition insoluble (feet) {cumulative f 

Rex member of Phosphoria formation--basal bed only 

R- 1 1 chert ---.r-1z89- RAH 1 7.4 1 1.1 1 -- 1 -- 1 -- ] 8s. 3 1 z. 3 1 z. s3 

·Phosphatic shale member of Phosphoria formation 

P-9Z Mudstone 1Z88- RAH Z.3 Z.8 -- -- -- 68.7 Z.3 6.44 

P-91 Mudstone 1Z87- RAH 1.7 6.0 -- -- -- 77.0 4.0 16.64 

P-90 Mudstone, calcareous and mudstone 1Z86- RAH 3.7 o.z -- -- -- 67.6 7. 7 17."38 

P-89 Mudstone 1Z85- RAH 3.3 1. 5 -- -- -- 79.6 11.0 ZZ.33 

P-88 Mudstone; fos. col. no. 48-JES-81 1 1Z84- RAH 4.1 3.5 -- -- -- 71.9 15. 1 36.68 

P-87 Phosphate rock, argillaceous; fos. col. no. 48-JES-80 1Z83- RAH 0.8 Z5.5 -- -- -- Z4.8 15.9 57.08 

P-86 Mudstone; fos. col. no. 48-JES-79 1Z8Z- RAH z.o 5. 6 -- -- -- 78.5 17.9 68.Z8 

P-85 Mudstone, calcareous; fos. col. no. 48-JES-78 1Z81- RAH 0.8 0.5 -- -- -- 63.8 18. 7 68.68 

P-84 Mudstone; fos. col. no. 48-JES-77 1Z80- RAH 1.7 6. 1 -- -- -- 80.7 Z0.4 79.05 

P-83 Phosphate rock 1Z05- RLP 1.7 35.0 1.4 0.46 5.90 4.7 ZZ.l 138.55 

P-8Z Mudstone and limestone 1Z04- RLP 1.6 5.0 8.5 Z.59 1Z.3Z 57.9 Z3.7 146.55 

P-81 Phosphate rock 1Z03- RLP 1. 5 33. 1 1.6 0.74 4.74 9.4 Z5.Z 196.ZO 

P-80 Phosphate rock lZOZ- RLP 0.8 3Z.Z z.z 0.85 4.64 11.6 Z6.0 ZZ1.96 

P-79 Mudstone, calcareous; fos. col. no. 48-JES-76 1Z01- RLP 1.0 7. 5 6.6 Z.46 10.64 55.3 Z7.0 ZZ9.46 

P-78 Phosphate rock lZOO- RLP l.Z Z9.4 3.3 0.96 5.ZZ 16.8 Z8.Z Z64.74 

P-77 Phosphate rock 1305-WOM 0.6 36.3 0.76 0.37 4.80 4.4 Z8. 8 Z86;.5Z 

P-76 Phosphate rock; fos. col. no. 48-JES-75 1304-WOM 4.7 31. 5 Z.7 0.60 7.86 9.7 33.5 434.57 

P-75 Phosphate rock, argillaceous; fos. col. no. 48-JES-74 lZlZ- CEW 3.55 zs. z 3.9 1. z 9.60 Zl'. 0 37.05 5Z4.03 

P-74 Phosphate rock and phosphatic mudstone lZll-CEW 1.5 Z6.5 4.1 1. 3 9.0Z Z4.0 38.55 563.78 

P-73 Mudstone, phosphatic, and argillaceous 

phosphate rock; fos. col. no. 48-JES-73 lZlO- CEW 1.6 15.8 7.5 z.z 9.80 46.4 40. 15 589.06 

P-7Z Mudstone, phosphatic; fos. col. no. 48-JES-7Z 1ZZ9- RPS l.Z 8.3 -- -- -- 6Z.4 11.35 599.0Z 

P-71 Limestone and mudstone 1ZZ8- RPS Z.8 0.7 -- -- -- 33. 1 44.15 600.98 

1 Fossil collection made by J. E. Smedley, Paleontology and Stratigraphy Branch, U. S. Geological Survey. 
Bed Sample Thickness Chemical analyses (percent} Cumulative Thickness x 

Rock description Loss on Acid thickness percent P 20 no. no. (feet) P205 AI2o3 Fe2

o3 ignition insoluble (feet) ( cumulativef 

P-70 Mudstone, phosphatic, calcareous; 

fos. col. no. 48-JES-71 1227- RPS 2.3 12.8 -- -- -- 45.0 46.45 630.42 

P-69 Mudstone; fos. col. no. 48-JES-70 1226- RPS 1.2 5. 4 . -- -- -- 64.4 47.65 636.90 

P-68 Mudstone, phosphatic 1225- RPS 1.3 11.8 -- -- -- 53.3 48.95 652.24 

P-67 Mudstone, phosphatic 1224- RPS 2.4 11.6 -- -- -- 48.5 51.35 680.08 

P-66 Mudstone 1223- RPS 1.1 5. 5 -- -- -- 71. 1 52.45 686.13 

P-65 Mudstone, phosphatic; fos. col. no. 48-JES-69 1222- RPS 3. 1 12.3 -- -- -- 54.6 55. 55 724.26 

P-64 Phosphate rock, argillaceous 1218-CEW 1. 5 25.5 -- -- -- 25.8 57.05 762. 51 

P-63 Mudstone; fos. col. no. 48-JES-68 1303-WOM 1.0 6. 1 -- -- -- 75.9 58.05 768.61 

P-62 Mudstone 1302-WOM 1.6 2.8 -- -- -- 81.4 59.65 773.09 

P-61 Mudstone; fos. col. no. 48-JES-67 1301-WOM 1.2 5. 8 -- -- -- 80.2 60.85 780.05 

P-60 Mudstone, phosphatic 1300-WOM 0.8 11.4 -- -- -·- 61.0 61.65 789. 17 

P-59 Mudstone, phosphatic; fos. col. no. 48-JES-66 1232-WOM 4.8 12. 1 -- -- -- 58.3 66.45 847.25 

P-58 Mudstone 1231-WOM 0.6 6.9 -- -- -- 68.9 67.05 851.39 

P-57 Mudstone, phosphatic; fos. col. no. 48-JES-65 1230-WOM 0.8 9.4 -- -- -- 65.7 67.85 858.91 <» P-56 Mudstone and phosphate rock 1215-CEW 1.9 12.6 -- -- -- 49.6 69.75 882.85 

P-55 Mudstone 1214-CEW 2.8 3. 3 -- -- -- 81.0 72.55 892.09 

P-54 Mudstone and phosphatic mudstone 1221- RPS 2.7 4.5 -- -- -- 71.7 75.25 904.24 - P-53 Mudstone 1220- RPS 0.9 1. 8 -- -- -- 79.9 76. 15 905.86 

P-52 Mudstone and phosphatic mudstone 1239- RPS 1. 2 5. 6 -- -- -- 73.6 77.35 912.58 

P-51 Mudstone and phosphate rock 1238- RPS 1.1 24.0 -- -- -- 26.1 78.45 938.98 

P-50 Mudstone and argillaceous phosphate 

rock; fos. col. no. 48-JES-64 1237- RPS 0.8 12. 5 -- -- -- 56.7 79.25 948.98 

P-49 Mudstone and phosphate rock 1236- RPS 1.2 16.9 -- -- -- 38.6 80.45 969.26 

P-48 Mudstone and phosphate rock 1235- RPS 1. 0 17.'4 -- -- -- 37.2 81.45 986.66 

P-47 Mudstone; fos. col. no. 48-JES-63 1234- RPS 3.0 5. 9 -- -- -- 72.7 84.45 1, 004.36 

P-46 Mudstone 1269-VEM 2.9 4.9 -- -- -- 65.9 87.35 1, 018. 57 

P-45 Phosphate rock 1268- VEM 2.9 31.8 -- -- -- 10. 5 90.25 1, no. 79 

P-44 Mudstone, phosphatic 1267- VEM 3.0 10.0 -- -- -- 60.5 93.25 1, 140. 79 

P-43 Mudstone, calcareous, phosphatic 1266-VEM 1. 4 10. 7 -- -- -- 43.4 94.65 1, 155. 77 

P-42 Mudstone, phosphatic 1265- VEM 0.6 14.7 -- -- -- 37.4 95.25 1, 164. 59 

P-41 Mudstone 1264-VEM 0.6 5. 8 -- -- -- 68.8 95.85 1, 168. 07' 

P-40 Mudstone, phosphatic 1263- VEM 0.8 12.0 -- -- -- 48.9 96.65 1, 177.67 

P-39 Mudstone, phosphatic 1262- VEM 0.5 8.0 -- -- -- 59.9 97. 15 1, 181. 67 

P-38 Mudstone, phosphatic 1261-VEM 1.1 12. 1 -- -- -- 41.3 98.25 1, 194. 98 

P-37 Mudstone, phosphatic 1260- VEM 2. 1 16.5 -- -- -- 43.5 100.35 1, 229. 63 

P-36 Limestone; fos. col. no. 48-JES-62 1279-WOM 1.0 2.2 -- -- -- 13.7 101.35 1, 231. 83 

P-35 Limestone; fos. col. no. 48-JES-61 1278-WOM 2.7 0.4 -- -- -- 9.7 104.05 1,232.91 

----~ -- ------··· --· 
P-34 Mudstone; fos. col. no. 48-JES-60 1Z77-·WOM 1.0 z. 1 80.7 105.05 1. Z35. 61 1. 

-- -- -- P-33 Mudstone, phosphatic 1Z76-WOM 0.5 8.9 -- -- -- 56.5 105.55 1. Z40. 06 

P-3Z Mudstone; fos. col. no. 48-JES-59 1Z75-WOM 1. 8 5.7 -- -- -- 74.9 107. 35 1, Z50. 3Z 

P~31 Mudstone, phosphatic; fos. col. no. 48-JES-58 1Z74-WOM z.6 13.1 -- -- -- 5Z.7 109.95 1, Z85. 94 

P-30 Mudstone, phosphatic 1Z73-WOM 3.5 14.5 -- -- -- 46.1 113.45 1, 336. 69 •,• 

P-Z9 Mudstone, phosphatic 1Z7Z-WOM 1.0 11.8 -- -- -- 65.7 114.45 1, 348.49 

P-2.8 Mudstone, phosphatic 1Z47- CEW 0.7 7.9 -- -- -- 65.7 115. 15 1, 354. oz ' P-Z7 Mudstone and phosphate rock 1Z46-CEW 3.Z 14.6 -- -- -- 48.6 118.35 1, 400. 74 

P-Z6 Mudstone and phosphate rock 12.45-CEW 1. 1 16.3 5.8 Z.44 6.06 36.7 119.45 1,418.67 

P-Z5 Phosphate rock 12.44- CEW 3.3 3Z.3 z. 1 1.31 5.40 9.0 1ZZ.75 1, 5Z5. Z6 

P-Z4 Phosphate rock 1Z43-CEW z.z Z8.5 3.6 1. 97 5. 1Z 15.5 1Z4.95 1. 587. 96 

P-Z3 Phosphate rock. argillaceous 1Z4Z- CEW 1.5 Z6.3 3. i 1. 47 7.3Z 2.0.4 1Z6.45 1,6Z1.41 

P-ZZ Phosphate rock. argillaceous; fos. col. no. 48-JES-57 1Z41-CEW 1. 9 zs. 6 3.4 1. 2.9 7.40 Z1.9 1Z8.35 1, 676. 05 

P-Zl Mudstone, phosphatic 1Z40-CEW Z.3 13.0 6.5 Z.48 11.54 46.4 130.65 1, 705. 95 

P-ZO Mudstone and phosphate rock 1309-CEW z.o 16.8 6.4 z.oz 7.90 41.6 13Z.65 1. 739. 55 

P-19 Phosphate rock, argillaceous 1308- CEW 1. z Z5. z 4.8 1. 54 4.64 Z3.8 133.85 1, 769. 79 

P-18 Phosphate rock 1307-CEW 3.4 33.8 1.4 o. 11 3.76 6. 1 137.Z5 1, 884. 11 

P-17 Phosphate rock, argillaceous 1306-CEW 4.0 Z9.9 z. 1 0.86 6.3Z 11.8 141.Z5 z, 004.31 

P-16 Mudstone, phosphatic 12.19- CEW 1. 9 16.3 6.8 Z.45 5. sz 48.3 143.15 . Z, 035. Z8 

P-15 Phosphate rock 1314- RAH z. 5 31.6 1. 9 0.91 4.56 9.0 145.65 z. 114. Z8 ~ 

P-14 Mudsto:J;le, phosph~tic 1313- RAH 1. 6 9.7 9.4 3.10 3.80 6Z.Z 147.Z5 Z,1Z9.80 

P-13 Phosphate rock 131Z- RAH 1. 8 33.7 1.8 0.68 3.84 5.1 149.05 z, 190.46 

P-12. Mudstone, phosphatic and phosphate rock; 

fos. col. no. 48-JES-56 1311- RAH 1. 5 Z4.6 5.5 1. 57 5.3Z Z3. 5 150.55 Z, ZZ7. 36 

P-11 Phosphate rock 1310- RAH 2..3 2.8.2. Z.5 0.87 6.10 14.0 15Z.85 Z, Z9Z. ZZ 

P-10 Phosphate rock, argillaceous; fos. col. no. 48-JES-55 1Z94-WOM 0.6 ZZ.9 0.76 0.55 4.16 Z8. 1 153.45 2., 305.96 

P- 9 Phosphate rock, argillaceous 12.99-WOM 0.3 Z7. 0 4.5 1. 66 5.36 Zl. 3 153. 75 z, 314. 06 

P- 8 Phosphate rock 12.98-WOM 2..9 34.4 0.94 0.47 5.94 3.4 156.65 Z,413.8Z 

P- 1 Phosphate rock 1Z97-WOM z.o Z9.9 Z.3 1. 00 7.56 1Z.3 158.65 z.473.6z 

P- 6 Mudstone 12.9Z-WOM l.Z 1. 8 -- -- -- 72..6 159.85 z, 475. 79 

P- 5 Limestone, argillaceous 12.91-WOM l.Z 0.3 -- -- -- 35.4 161.05 3, 476. 14 

P- 4 Mudstone; fos. col. no. 48-JES-54 1Z90-WOM 0.4 0.9 -- -- -- 76.4 161.45 z, 476. 50 

P- 3 Mudstone 1Z71-WOM 0.6 o. 1 -- -- -- 79.4 16Z.05 z. 476. 56 

P- Z Limestone, argillaceous; fos. col. no. 48-JES-53 1Z70-WOM 0.8 1. 8 -- -- -- 43.8 16Z.85 Z.478.00 

p.::: 1 Phosphate rock 1Z96-WOM 0.4 32..7 -- -- -- 5. 9 163.Z5 Z,491.08 

Wells formation 

Cw-1 I Limestone; fos. col. no. 48-JES-5Z 12.95-WOM 4.2. 
OJ 

SPECTROGRAPHIC ANALYSES-NORTH WOOLEY RANGE, IDAHO. LOT NO. 1230. 

Semi-quantitative analyses of selected samples of the phosphatic shale member of the Phosphoria formation, North Wooley Range, 

Idaho (see immediately preceding pages for location of section, thickness and· description of strata, and chemical analyses of samples), 

made by the U. S. Geological Survey, Geochemistry and Petrology Branch, Washington, D. C. In addition to the elements listed in the 

table below, Sb, As, Be, Bi, Cs, Co, Cb, Dy, Er, Eu, Gd, Au, Hf, Ho, Li, Lu, Nd, Pt, K, Pr, Rb, Sm, Sc, Ta, Te, Tb, Tl, Th, Tm, 

Sn, Ti, ~nd W were looked for in all samples but were not detected. 

Bed 

no. 

P-83 

P-82' 

P-81 

P-80 

P-79 

P-78 

P-77 

P-76 

P-75 

P-74 

P-73 

P-26 

P-25 

P-24 

P-23 

P-22 

P-21 

P-20 

P-19 

P-18 

Explanation of symbols 

Sample no. Al Ba B Cd Ca 

A = more than 10 percent 

B'= 1-10 percent! 

D = 0.1-1 percent 

E = 0. 0 1-0. 1 percent 

Cr Cu Fe Ga In La 

Beds P-92 through P-84 not a~a1yzed. 

1205- RLP D F ND ND A D F E ND ND E 

1204- RLP A F F ND B' D F B' ND F F 

1203- RLP B' F ND ND A D F D F ND E 

1202- RLP B' F ND ND A D F D ND ND E 

1201- RLP A E F ND B' D E B' F G F 

1200- RLP B' E ND ND A D F D F ND E 

1305-WOM B' F ND E A D F D ND ND E 

1304-WOM D F ND F A D F E ND ND E 

1212- CEW B' F ND E A D E D F G ND 

1211-CEW B' F ND E A D E D F G ND 

1210- CEW A E ND E B' D E B' F G E 

Beds P-72 through P-27 not analyzed. 

1245-CEW B' E ND ND A D E B' F ND E 

1244- CEW B' F ND ND A D E D F ND E 

1243-CEW B' ND ND ND A D F B' F G E 

1242- CEW B' F ND E A D E D F G E 

1241- CEW B'. F ND ND A D E D F ND E 

1240-CEW A E ND .E B' D E B' F G E 

1309-CEW A F ND E B' D E B' F ND E 

1308-CEW B' F ND E A E E D F G E 

1307-CEW B' F ND E A D F D ND ND E 

F = 0. 001-0.01 percent 

G = less than 0. 001 percent 

ND = not detected 

Pb Mg Mn Mo Ni p Si 

ND E E F E A B' 

F D D F E B' A 

F E E F E A B' 

ND E E F E A B' 

F D D F E B' A 

ND E E F E A B' 

ND E E F E A B' 

ND E E F E A B' 

E E E F E A B' 

E E E F E A B' 

E E D ~ E B' A 

F E E F E A B' 

F E E F E A B' 

F E D F E A B' 

E E D F E A B' 

E E E F E A B' 

E E E E E B' A 

F E E E E B' A 

F .E D F E A B' 

F E E F E A B' 

Ag Na Sr Ti v y Yb Zn 

G D D E D E G ND 

G D E D E E G E 

G D D E E E G ND 

G D D E E E G ND 

G D E D E E G E 

G D D E D E G E 

G D D E D -E G E 

G D D F D E G ND 

G D D E D E G E 

G D D E D E G E 

G D D D D E G E 

G D D E E E G E 

G D D E E E G E 

G D D E E E G E 

G D D E D E F E 

F D- D E D E F E 

F D D D D E F E 

F D D E .D E G E 

G D D E D E G E 

G D D E D E G E 

Zr 

I 

F 

E 

F 

F 

E 

l:4' 

F 

F 

F 

F 

E 

F 

F 

F 

E 

F 

E 

E 

F 

F 
P-17 1306-CEW B' F ND E A D E D ND ND E F E E F E A B' G D D E. D E G E. F 

P-16 1219-CEW A E ND ND B' D E B' F G E E E E E E B' A G D D D D E G E E 

P-15 1314- RAH B' F ND E A D F D F ND F ND E E F E A B' G D D E D E G E F 

P-14 1313- RAH B' F ND E A D F D F ND F ND E JI: F E A B' G D D E D E G E F 

P-13 1312- RAH B' F ND E A D F D F ND F F E E F E A B' G D D E D E G E F 

P-12 1311- RAH B' E ND E A D E D F G E E E D F E A B' G D D E D E G E F 

P-11 1310- RAH B' F ND E A D E D F ND E E E E F E A B' G D D E D E G E F 

P-10 1294-WOM B' F ND F A D F D F F E E E D F E A B' G D D E D E G E E 

P- 9 1299-WOM B' F ND F A D F D ND G E F E D F E A B' G D D E D E G E F 

P- 8 1298-WOM D F ND E A D F E ND ND E F E E ·ND E A B' G D D E D E G E F 

P- 7 1297-WOM B' F ND E A D E D ND ND E E E E F F A B' G D D E D E G E F 

Beds P-6 through P-1 not analyzed. 

1 B' is equivalent to B and C of Bureau of Mines analyses as recorded in other reports. 

tO 

• 
I-' 

0 

NORTH RASMUSSEN VALLEY, IDAHO. LOT NO. 1233. 

Phosphoria formation sampled in bulldozer trench on northeast slope of Rasmussen Valley, sec. 6, T. 7 S., R. 44 E., Caribou County, Idaho, 

on southwest limb of Snowdrift anticline. Beds strike N. 53° W. and dip 63° SW. Section measured by R. A. Hoppin, C. E. Weaver, R. L. Parker, 

R. P. Sheldon, D. F. Davidson, and F. W. 0' Malley and sampled by R.·A. Smart and R. G. Waring. Samples analyzed for P 0 and acid insoluble 

by U. S. Bureau of Mines Laboratory, Albany, Oregon, and for other constituents by Trace Elements Section Laboratory, l:.r. ~ Geological Survey, 

Washington, D. C. 

Bed Chemical analyses (percent) Cumulative Thickness x Sample Thickness 1 l ll Loss on I Acid thickness percent P 2

Rock description 0 no. (feet) P205 Al203 Fe203 ignition insoluble (feet) (cumulative f no. 

Dinwoody formation--basal bed only 

'Jrd-z Siltstone 1418- RAH 4.0 o. 5 -- -- -- 78.2 -- -- 'Jrd-1 Phosphate rock., argillaceous, 

conglomeratic 1417- RAH 0.6 21.2 -- -- -- 31.6 -- -- Rex member of Phosphoria formation 

R-24 Mudstone; fos. col. no. 48-JES-821 1416- RAH 2.3 4.0 -- -- -- 77.0 2.3 9.ZO 

R-23 Mudstone; fos. col. no. 48-JES-83 1415- RAH 10.0 4.2 -- -- -- 71.6 12.3 51.20 

R-22 Mudstone 1414- RAH 10.0 5. 6 -- -- -- 62. 7 22.3 107.20 

R-21 Phosphate rock, argillaceous 1413- RAH 2.0 21.2 -- -- -- 31.4 24.3 149.60 

R-20 Mudstone 1412- RAH 2. 1 2.2 -- -- -- 69.7 26.4 154.22 

R-19 Mudstone 1411- RAH 10.5 3. 1 -- -- -- 73.6 36.9 186.77 

R-18 Mudstone., cherty 1410- RAH 7.0 1. 5 -- -- -- 83.7 43.9 197.27 R-17 Mudstone; fos. col. no. 48-JES-84 1409- RAH 10.0 1. 9 -- -- -- 82.4 53.9 216.27 

R-16 Chert 1408- RAH 2.0 2. 1 -- -- -- 88.4 55.9 220.47 

R-15 Mudstone, cherty; fos. col. no. 48-JES-85 1407- RAH 12.0 2.4 -- -- -- 73.3 67.9 249.27 

R-14 Mudstone 1406- RAH 10.0 2. 1 -- -- -- 77.0 77.9 270.27 R-13 Mudstone 1405- RAH 10.0 1.3 -- -- -- 80.4 87.9 283.27 

R-12 Mudstone 1404- RAH 10.0 1. 5 -- -- -- 81.2 97.9 298.27 

R-11 Mudstone 1403- RAH 10.0 1. 6 -- -- -- 82.2 107.9 314.27 R-10 Mudstone 1402- RAH 10.0 1.9 -- -- -- 76.5 117.9 333.27 

R- 9 Mudstone 1401- RAH 10.0 1.6 -- -- -- 79.2 127.9 349.27 

R- 8 Mudstone 1400- RAH 10.0 1. 3 -- -- -- 83.5 137.9 362.27 

R- 7 Mudstone 1399- RAH 10.0 1.9 -- -- -- 81.3 147.9 381.27 

R- 6 Mudstone 1398- RAH 10.0 1.2 -- -- --. 83.7 157.9 393.27 R- 5 Chert 1397- RAH 5.4 0.6 -- -- -- 92.2 163.3 396.51 

R- 4 Chert and mudstone 1396- RAH 5. 1 o. 9 -- -- -- 88.5 168.4 401. 10 

R- 3 Chert 1395- RAH 4.0 1. 2 -- -- -- 90.2 172.4 405.90 R- 2 Chert 1394- RAH 10.0 2. 9 -- -- -- 87. 1 182.4 434.90 R- 1 Chert 1384- DFD 10.0 o. 2 -- -- -- 88.9 192.4 436.90 .__ 
·-., 

' 

I-'" 

I-'" 

P-83 

P-82 

P-81 

P-80 

P-79 

P-78 

P-77 

P-76 

P-75 

P-74 

P-73 

P-72 

P-71 

P-70 

P-69 

P-68 

P-67 

P-66 

P-65 

P-64 

P-63 

P-62 

P-61 

P-60 

P-59 

P-58 

P-57 

P-56 

P-55 

P-54 

P-53 

P-52 

P-51 

P-50 

P-49 

P-48 

P-47 

P-46 

P-45 

Phosphatic shale member of Phosphoria formation 

Mudstone 1383- DFD 1.6 1.3 -- -- -- 82.6 

Mudstone 1382- DFD 0.9 2. 5 -- -- -- 70.6 

Mudstone 1381- DFD 2.5 3.9 -- -- -- 69.3 

Mudstone. phosphatic 1380- DFD 0.9 9. 5 -- -- -- 40.1 

Mudstone, phosphatic; fos. col. no. 

48-JES-103 1339- DFD 0.7 16. 1 -- -- -- 48.2 

Mudstone 1338- DFD 1.7 3. 2 -- -- -- 76.6 

Mudstone; fos. col. no. 48-JES-104 1337- DFD 2. 1 1. 1 -- -- -- 80. 1 

Mudstone 1336- DFD 0.8 3. 7 -- -- -- 73. 1 

Phosphate rock 1335- RLP 1. 3 36.2 1.1 0.36 6.50 3. 7 

Phosphate .rock and mudstone 1334- RLP 1.0 26.4 3. 1 1. 64 7.90 15.2 

Mudstone 1525-WOM 0.4 7. 3 8.4 3.89 9. 50 65. 1 

Phosphate rock 1524-WOM 2.0 31. 3 1.9 0.94 27.28 12. 3 

Phosphate rock, argillaceous 1332- RLP 1.8 23.9 4.9 1. 65 8.08 27.5 

Phosphate rock 1331- RLP 1.2 33.8 1.6 o. 58 6.96 5. 7 

Phosphate rock 1330- RLP 1.0 35:5 1.5 0.52 s. 12 3. 3 

Phosphate rock 1523-WOM 1.3 29.9 2.8 1. 05 11.32 11.3 

Phosphate rock 1522-WOM 4.1 27.4 3.2 1. 14 9.80 17.4 

Mudstone, phosphatic 1379-WOM 2.4 13.'1 8.3 2. 37 11.04 so. 9 

Mudstone 1349- RPS 1.3 6. 0 -- -- -- 67.3 

Mudstone, phosphatic 1348- RPS o.s 11.3 -- -- -- 51.7 

Mudstone and argillaceous phosphate rock 1347- RPS 1.8 11.3 -- -- -- 49.3 

Mudstone and phosphate rock; fos. col. no. 48-JES-105 1521-WOM 1.2 9.0 -- -- -- 52.7 

Phosphate rock, argillaceous 1520-WOM 0.8 19. 5 -- -- -- 28.7 

Mudstone 1345- RPS 1. 4 7. 6 -- -- -- 63.3 

Phosphate rock and mudstone 1344- RPS 2.3 16.8 -- -- -- 42.5 

Phosphate rock, argillaceous 1343- RPS 1.4 25.4 -- -- -- 26.3 

Mudstone 1342- RPS 1. 1 6. 6 -- -- -- 73.4 

Mudstone, phosphatic 1529-WOM 2. 6 14.0 -- -- -- 52.6 

Mudstone, phosphatic; fos. col. no. 48-JES-106 1528-WOM 3.0 8. 3 -- -- -- 68.0 

Mudstone 1340- RPS 0.6 7. 7 -- -- -- 66.3 

Mudstone 1369- RAH 1.0 7.4 -- -- -- 66.6 

Phosphate rock, argillaceous 1368- RAH 0.6 26.3 -- -- -- 22.0 

Mudstone 1367- RAH 0.7 6.8 -- -- -- 62.9 

Mudstone 1366- RAH 1. 1 5. 9 -- -- -- 69.2 

Mudstone and phosphate rock 1365- RAH 3.5 7.4 -- -- -- 63.1 

Mudstone 1364- RAH 1. 1 5. 2 -- -- -- 71.4 

Mudstone 1363- RAH 3.6 5. 6 -- -- -- 69.9 

Phosphate rock, argillaceous 1378-WOM 1. 1 21.2 -- -- -- 32.2 

Mudstone, phosphatic 1377-WOM· 0.6 8.6 -- -- -- 62.5 

Fossil collection made by J. E. Smedley. Paleontology and Stratigraphy Branch., U.S. Geological Survey. 

1.6 2.08 

"2.5 4.33 

5. 0 14.08 

5. 9 22.63 

6. 6 33.90 

s. 3 39.34 

10.4 41.65 

11.2 44.61 

12.5 91.67 

13. 5 118.07 

13.9 120.99 

15.9 183.59_ 

17. 7 226.61 

18.9 267.17 

19.9 302.67 

21.2 341 •. 54 

25.3 453.88 

27.7 485.32 

29.0 493.12 

29.8 502.16 

31.6 522.50 

32.8 533.30 

33.6 548.90 

35.0 559.54 

37.3 598.18 

38.7 633.74 

39.8 641. 00 

42.4 677.40 

45.4 702.30 

46.0 706.92 

47.0 714.32 

47.6 730.10 

48.3 734.86 

49.4 741. 35 

52.9 767.25 

54.0 772.97 

57.6 793.13 

58.7 816.45 

59.3 821.61 
........ 

C\.:1 

Bed 

no. 

P-44 

P-43 

P-42 

P-41 

P-40 

P-39 

P-38 

P-37 

P-36 

P-35 

P-34 

P-33 

P-32 

P-31 

P-30 

P-29 

P-28 

P-27 

P-26 

P-25 

P-24 

P-23 

P-22 

P-21 

P-20 

--

P-19 

P-18 

P-17 

P-16 

P-15 

P-14 

P-13 

P-12 

Rock description 

Phosphate rock, calcareous and 

phosphatic mudstone 

Mudstone 

Phosphate rock, argillaceous 

Mudstone 

Mudstone and argillaceous phosphate 

rock; fos. col. no. 48-JES-107 

Phosphate rock, argillaceous 

Phosphate rock, argillaceous 

Mudstone 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone 

Mudstone, phosphatic 

Mudstone, phosphatic 

Phosphate rock, argillaceous 

Mudstone 

Phosphate rock and phosphatic 

mudstone 

Mudstone, phosphatic, calcareous 

Mudstone. phosphatic, calcareous 

Mudstone, phosphatic 

Mudstone, phosphatic \ 

Mudstone, phosphatic 

Phosphate rock, argillaceous 

Phosphate rock; fos. col. no. 48-JES-1 24 

Phosphate rock, argillaceous and phosphatic 

mudstone 

Mudstone and argillaceous calcareous 

phosphate rock 

Mudstone and argillaceous phosphate rock 

1389-WOM is equivalent to 1390-WOM. 

Phosphate rock and mudstone 

Phosphate rock, argillaceous 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock and mudstone 

Mudstone, phosphatic 

Phosphate rock 

Sample Thickness 

no. (feet) P2o5 

1376-WOM 2. 1 17. 7 

1375-WOM 0.7 4.7 

1374-WOM 1.1 22.4 

1373-WOM 0.8 3. 5 

1370-CEW 1.3 11.2 

1371- CEW 2.7 19. 1 

1372-CEW 4.3 15.5 

1329-WOM 1.8 3.3 

1328-WOM 1.5 9.2 

1327-WOM 0.4 12. 5 

1326-WOM 2.0 2. 1 

1325-WOM 0.5 13.2 

1324-WOM 0.7 14.3 

1323-WOM 0.8 20.7 

. 1322-WOM 0.7 7. 2 

1321-WOM 0.9 24.1 

1527-WOM 3.0 13.8 

1526-WOM 3.0 13. 1 

1362- RAH 0.35 7. 9 

1361- RAH 3.4 13.6 

1360- RAH 0.6 8.4 

1393-WOM 0.8 16.8 

1392-WOM 3.0 27.3 

1391-WOM 2.7 21.2 

1390-WOM 2.8 13.6 

1389-WOM (3. 0) 18.3 

1388-WOM 1. 4 29.2 

1387-WOM 4.0 20.6 

1386-WOM 1.5 31.4 

1359-CEW 1. 05 28. 5 

1358-CEW 1. 4 31.3 

1357-CEW 0.9 27.4 

1356-CEW 0.8 10.3 

1355-CEW 2. 3 . 31.3 

Chemical analvses (percent) Cumulative Thickness x 

Loss on Acid thickness percent P 20 Al2o 3 Fe2o 3 ignition insoluble (feet) (cumulativef 

-- -- -- 33.5 61.4 858.78 

-- -- -- 76.3 62.1 862.07 

-- -- -- 36.2 63.2 886.71 

-- -- -- 36.3 64.0 889.51 

-- -- -- 54.4 65.3 904.07 

-- -- -- 31.0 68.0 955.64 

-- -- -- 34.9 72.3 li 022. 29 

-- -- -- 73.3 74. 1 1, 028. 23 

-- -- -- 62.8 75.6 1, 042. 03 

-- -- -- 52.8 76.0 1, 047. 03 

-- -- -- 84.8 78.0 1,051.23 

-- -- -- 50.4 78.5 1, 057. 83 

-- -- -- 48.4 79.2 1, 067. 84 

-- -- -- 34.3 80.0 1. 084.40 

-- -- -- 67.9 80.7 1, 089. 44 

-- -- -- 24.9 81.6 1,111.13 

-- -- -- 42. 1 84.6 1, 152. 53· 

-- -- -- 41.0 87.6 1,191.83 

-- -- -- 61.2 87.95 1, 194. 60 

-- -- -- 46.0 91.35 1, 240. 84 

-- -- -- 60.5 91.95 1, 245. 88 

8.6 2.60 8.94 41.2 92.75 1, 259. 32 

3. 1 1.77 8.94 18. 1 95.75 1,341.22 

3.9 1.41 10.38 30.9 98.45 1, 398. 46 

5.9 2.11 13.32 43.4 101.25 1, 436. 54 

5.3 1.78 12.30 36.9 -- --

2.9 1. 18 2.88 16.7 102.65 1,477.42 

5.5 1.99 8.24 36. 1 106.65 1, 559. 82 

2.4 1. 15 5.82 12.7 108.15 1,606.92 

2.3 0.85- 7. 76 15. 3 109.20 1, 636. 84 

2.7 0.98 9.36 12. 1 110.60 1, 680. 66 

3.5 1.25 6.60 20.7 111. so 1• 705. 32 

7. 3 2.65 7. 70 58.3 lll. 30 1.713.56 

2.0 0.92 6.62 13.0 114.60 1, 785. 55 
1--' 

c..:> 

P-11 Mudstone, phosphatic 1354-CEW 1.0 11.3 7.9 2.11 1. 16 53.6 115.60 1, 796. 85 

P-10 Phosphate rock 1353-CEW 4.0 34.5 1. 4 0.56 8.88 5. 9 11.9. 60 1, 934. 85 . 

P- 9 Mudstone, phosphatic 1352-CEW 0.45 13.5 1. 8 2.13 8.42 52.0 120.05 1, 940. 93 

P- 8 Phosphate rock, argillaceous 1351- CEW 0.7 24.5 4.2 1. 54 5.98 25.6 120.75 1, 958. 08 

P- ., Mudstone 1350-CEW 0.8 4.9 1. 1 0.55 8.08 9.2 121. 55 1, 961. 99 

.::- 6 Phosphate rock 1000- RAH 1. 4 27.9 3.4 1. 01 5. 98 . 16.4 122.95 2, 001. 06 

P- 5 Phosphate rock, calcareous, argillaceous; 

fos. col. no. 48 -JES-125 1319- RAH 0.7 15. 1 3.0 1. 06 6.70 21. 1 123.65 2,012.05 

P- 4 Phosphate rock 1419-WOM 2.0 33.9 1. 0 0.56 1. 18 5. 3 125.65 2, 079.85 

P- 3 Phosphate rock 1233-WOM 3.0 32. 5 I. 1 0.93 8.06 6.6 128. 65 2, 177.35 

P- 2 Mudstone, calcareous 1317- RAH 3.0 2. 2 6.8 2.65 19.66 51.9 131.65 2, 183. 95 

P- 1 Phosphate rock 1316- RAH 0.5 32.4 0.98 0.82 19.80 5. 1 132.15 2, zoo. 15 ------------- -~ ·--

Wells formation 

Cw-1 I Limestone I 1315- RAH I 3. 1 I o. 6 I -- I -- I -- I 1. 8 I -- ---[ -- j 
I-" 

fP.. 

SPECTROGRAPHIC ANALYSES-NORTH RASMUSSEN VALLEY, IDAHO. LOT NO. 1233. 

Semi-quantitative analyses of selected samples of the phosphatic shale member of the Phosphoria formation, North Rasmussen Valley, 

Idaho (see immediately precedi:q.g pages for location of section, thickness and description of strata, and chemical analyses of samples), made 

by U. S. Geological Survey, Geochemistry and Petrology Branch, Washington, D. C. In addition to the elements listed in the table below, Sb, 

As, Be .. Bi, Cs, Cb, Dy, Er, Eu, Gd, Au, Hf, Ho, Li, Lu, Nd, Pt., K, Pr, Rb, Sm., Sc, Ta, Te, Tb, Tl, Th, Tm, Sn, Ti, and W were looked for in all samples but were not detected. 

Bed 

no. 

P-75 

P-74 

P-73 

P-72 

P-71 

P-70 

P-69 

P-68 

P-67 

P-66 

P-23 

P-22 

P-21 

P-20 

--

P-19 

P-18 

P-17 

P-16 

P-15 

P-14 

P-13 

P-12 

P-11 

P-10 

Explanation of symbols 

Sample no. Al Ba B Cd Ca 

A = more than 1 0 percent 

B1= 1-10 percent1 

D = o. 1-1 percent 

E = 0. 01-0.1 percent 

Cr Co Cu Fe Ga La 

Beds P-83 through P-76 not analyzed. 

1353-CEW D F ND E A E ND F D ND E 

1334- RLP B' F ND E A E- ND F B' F E 

1525-WOM B' F ND ND B' E ND F B' F ND 

1224-WOM B' G ND ND A E ND F B' ND E 

1332- RLP B' F ND E A D ND F B' F E 

1331- RLP D F ND E A E ND F D ND E 

1330- RLP D F ND E A D ND F D ND E 

1523-WOM B' G ND ND A D ND F B' ND E 

1522-WOM B' F ND ND A D ND F B' ND E 

1379-WOM A F ND ND B' D ND F B' F ND 

Beds P-65 through P-24 not analyzed. 

1393-WOM B' F ND E B' D ND F B' F E 

1392-WOM B' F ND E A D ND F B' F E 

1391-WOM B' F ND E B' D ND E B' F E 

1390-WOM B' F ND E B' D ND E B' F E 

1389-WOM B' F ND E B' D ND E B' F E 

1388-WOM B' F ND E A D ND F B' ND E 

1387-WOM B' F ND E B' E ND F B' F E 

1386-WOM B' F ND E A D ND F B' ND E 

1359-CEW D E G E A E F E D ND E 

1358-CEW D E F E A. E ND F D ND F 

1357-CEW D F ND E A E E F B' ND E 

1356-CEW B' F ND E B' E ND F B' F ND 

1355-CEW B' F ND E A E ND F B' ND E 

1354- CEW A F ND E B' E ND F B' F ND 

1353-CEW D F ND E A E ND F D ND E 

F = 0. 001-0.01 percent 

G = less than o. 001 percent 

ND = not detected 

Pb Mg Mn Mo Ni p Si 

ND E E F E A B' 

ND D E ND E A B' 

ND D F F E B' A 

ND E F ND E A B' 

ND D E ND E A A 

ND E E ND E A B' 

ND D E ND E A B' 

ND D F ND E A B' 

ND D F ND E A B' 

F D F F E B' A 

ND D E F E B' A 

ND D E F E B' B' 

E D F F E B' A 

E D F F E B' A 

E D F F E B' A 

ND D F F E A B' 

ND D E F E B' A 

F D F F E A B' 

F D F G E A B' 

F D F G E A B' 

E D ND F E A B' 

E D E F E B' A 

ND D E F E A B' 

ND D E F E B' A 

ND D F ND E A B' 

Ag Na Sr Sn. Ti v y Yb Zn 

ND D E ND F E E G ND 

G D D ND E E E G E 

G D E ND D E ND ND ND 

G D E ND E E E G ND 

G D D ND E. E E G E 

G D D ND E E E G E 

G D D ND E E E G E 

G D E ND E E E G ND 

G D E ND E E E G ND 

G D E ND E E E G ND 

G D E ND E E E G E 

G D D ND E E E G E 

F D E ND E E E G E 

F D E ND E D E G E 

F D D ND E E E G E 

F D D ND E E E G E 

G D E ND E E E G E 

G D D ND E E E G E 

G D E F E D E G E 

G D E F· E D E G E 

ND B' D ND E E E G E 

G D E ND D E F G E 

G D D ND E E F G E 

G D E ND D E F G E 

G D D ND E E F G E 

Zr 

F 

F 

F 

F 

F 

F 

F 

F 

F 

F 

F 

F 

F 

F 

F 

F 

F 

F 

E 

F 

F 

F 

F 

F 

F 
1-' 

c:..n 

P- 9 

P- 8 

P= 7 

P- 6 

P- 5 

P- 4 

P- 3 

P- Z 

P- 1 

135Z-CEW A F ND E B' E ND F B' F ND ND D E F E B' A 

1351-CEW B' F ND E A E ND F B' .F E ND D E F E B' B' 

1350-CEW D F ND E A E ND F D ND ND F A E F E D B' 

1000- RAH B' E F E A E ND E D ND E F D F F E A B' 

1319- RAH B' F ND E A E ND F B' ND E ND B' E F E B' B' 

1419-WOM D G ND E A E ND F D ND E ND D F ND E A D 

1Z33-WOM D F ND E A D ND F B' ND E E D F F E A B' 

1317- RAH B' F ND E B' E ND F B' F ND ND B' E F D D A 

1316- RAH B' F ND E A E ND F B' ND E ND D E ND E A B' 

1 B' is equivalent to Band C of the Bureau of Mines analyses. as recorded in other reports. 

G D E ND E E F G E F 

G D D ND E E F G E F 

G D E ND F E F G E F 

G D E ND E D E G E F 

G D E ND E E F G E F 

G D E ND F E E G E F 

G B' E ND E E E G E F 

ND D E ND E E F G E F 

G D D ND E E F G E F 
1--' 

m 

SOUTH RASMUSSEN VALLEY, IDAHO. LOT NO. 1Z3Z. 

Phosphatic shale member of Phosphoria formation sampled in bulldozer trench on northeast slope of Rasmussen Valley, sec. 9, T. 7 S., 

R. 44 E., Caribou County, Idaho, on southwest limb of Snowdrift anticline. Beds strike N. 45• W. and dip about 6o• SW. Many beds within the 

phosphatic shale member are locally tightly folded, faulted, and overturned. Section measured by F. W. 0' Malley and D. F. Davidson and 

sampled by R. A. Smart and R. G. Waring in July 1948. Samples analyzed for P20 5 and acid insoluble by U. S. Bureau of Mines Laboratory, 

Albany, Oregon, and for other constituents by Trace Elements Section Laboratory, U. S. Geological Survey, Washington, D. C. 

Bed Sample Thickness Chemical analyses {percent) Cumulative Thickness x Rock description I 1 ~1 Loss on I Acid thickness percent P z 0 no. no. (feet) 5 Pz0 5 Alz0 3 Fez0 3 ignition insoluble (feet) (cumulative) 

Rex member of Phosphoria formation--basal beds only 

R- 6 Chert 149Z- DFD o.8 0.6 -- -- -- 94.4 0.8 0.48 

R- 5 Chert 1491- DFD 1. 8 o. 6 -- -- -- 94.4 Z.6 1. 56 

R- 4 Chert 1490- DFD 1. z o. 5 -- -- -- 94.5 3. 8 z. 16 

R- 3 Chert 1474- DFD 1. 4 0.4 -- -- -- 9Z.9 5. z z. 7Z 

R- Z Chert 1473- DFD Z.3 o. 1 . -- -- -- 9Z.7 7. 5 z. 95 

R- 1 Chert 147Z- DFD 1.5 4.4 -- -- -- 74.6 9.0 9. 55 

. Phosphatic shale member of Phosphoria formation 

P-7Z Mudstone, cherty 3190-WOM 0.9 Z.7 -- -- -- 83.Z 0.9 Z.43 

P-71 Mudstone 3189-WOM 0.7 4. 5 -- -- -- 7Z. Z 1. 6 5.58 

P-70 Mudstone 3188-WOM 1. z 3. 7 -- -- -- 73.6 z. 8 lO.OZ 

P-69 Phosphate rock, argillaceous 3187-WOM 0.8 Z5.9 -- -- -- Z8.5 3. 6 30.74 

P-68 Mudstone 3186-WOM 1.· 7 1. 5 -- -- -- 79.Z 5. 3 33.Z9 

P-67 Mudstone 3185-WOM 1. 7 0.6 -- -- -- 83.8 7. 0- 34.31 

P-66 Phosphate rock, argillaceous I 3184-WOM 0.3 Z1. 7 -- -- -- 34.8 7. 3 40.8Z 

P-65 Mudstone 3183-WOM 0.9 1. 3 -- -- -- 80.9 s.z 41.99 

P-64 Mudstone 1459- DFD 0.7 6.9 -- -- -- 67.9 8.9 46.8Z 

P-63 Mudstone, calcareous, phosphatic 1458- DFD 1.1 Z6.6 3.3 1. 01 5. 74 zo.s 10.0 78.06 

P-6Z Phosphate rock 1457- DFD 1. 1 36.0 1. 4 0.53 3.Z4 3. 6 11. 1 115.68 

P-61 Phosphate rock 1456- DFD 1.0 30. 1 Z.6 0.80 9.Z8 lZ. 0 1Z. 1 145. 78 

P-60 Phosphate rock 1455- DFD 1. 4 Z9.8 3.Z 0.80 37.00 1Z. 0 13.5 187. 50 

P-59 Phosphate rock, argillaceous 1454- DFD 1. 0 Z5. 8 3.8 1.Z4 9.88 Z1. 1 14.5 Z13.30 

P-58 Phosphate rock, argillaceous 1453- DFD Z.6 Z7. 1 3.4 1. 15 8.84 zo. 1 17. 1 Z83. 76 

P-57 Phosphate rock, argillaceous 145Z- DFD 0.5 Z7. Z 3. 1 0.85 8.38 Z0.5 17.6 Z97. 36 

P-56 Phosphate rock, argillaceous 1451- DFD 0.6 zo.o 5. 7 1.31 9.7Z 36.0 18. z 309.36 

P-55 Phosphate rock, argillaceous 1450- DFD 0.6 17.8 6.7 1.ZZ 9.86 40~4 18.8 3Z0.04 

P-54 Mudstone, phosphatic 1439- DFD 1. 3 14.6 8.3 1. 95 9.74 45.3 zo. 1 339.0Z 

P-53 Mudstone, calcareous 1438- DFD 0.6 8.4 -- -- -- 6Z. 5 Z0.7 344.06 

P-5Z Mudstone 1437- DFD 1.3 5.4 -- -- -- 66.7 zz.o 351.08 

P-51 Mudstone, phosphatic 1479- DFD 1. 1 13. z -- -- -- 44.8 Z3.1 365.60 

P-50 Mudstone, phosphatic 1478- DFD 0.7 8. 7 -- -- -- 58.7 Z3.8 371. 69 

P-49 Mudstone, phosphatic 1477- DFD 1. z 15.8 -- -- -- 43.Z Z5.0 390.65 
P-48 Mudstone, phosphatic 1476- DFD 0.9 12. 3 -- -- -- 55.9 25.9 

I 

401. 72 

P-47 Mudstone, phosphatic 1475- DFD 4.6 12.8 -- -- -- 49.3 30.5 460.60 

P-46 Mudstone, phosphatic 1436- DFD 4.0 10.2 -- -- -- 59.0 34.5 501.40 

P-45 Mudstone, calcareous and phosphate 

rock 1435- DFD 3.2 15.2 -- -- -- 47.2 37.7 550.04 

P-44 I Phosphate rock, argillaceous 1434- DFD 0.8 20.6 -- -- -- 39.8 38.5 566.52 

P-431 Mudstone 1433- DFD 0.9 7. 6 -- -- -- 69.1 39.4 573.36 

P-42 Mudstone, phosphatic; fos. col. no. 48-JES-1281 1432- DFD 1. 8 10.6 -- -- -- 64.6 41.2 592.44 P-411 Mudstone, phosphatic 1431- DFD 2.5 10.5 -- -- -- 64.6 43.7 618.69 

P-40 Mudstone 1430- DFD 1.5 7. 6 -- -- -- 70.9 45.2 630.09 

P-39 Mudstone and argillaceous phosphate 

rock 1445-WOM 2 •. 2 7. 8 -- -- -- 65.6 47.4 647. 25 

P-38 Mudstone 1444-WOM 2.9 7. 4 -- -- -- 67.6 50.3 668.71 

P-37 Mudstone 1443-WOM 1.2 3. 7 -- -- -- 61.5 51. 5 673. 15 

P-36 Phosphate rock, argillaceous 1442-WOM 2.0 21.1 -- -- -- 36.5 53.5 715~ 35 

P-35 Mudstone, phosphatic 1441-WOM 2.4 17. 1 -- -- -- 44.6 55.9 756.39 

P-34 Mudstone and calcareous argillaceous 

phosphate rock 1440-WOM 1. 0 10. 3 -- -- -- 46.0 56.9 766.69 

P-33 Mudstone 1429-WOM 1. 1 4.2 -- -- -- 73.8 58.0 771. 31 

P-32 Mudstone, phosphatic 1428-WOM 0.5 15. 1 -- -- -- 48.1 58.5 778.86 

P-31 Mudstone, phosphatic and argillaceous 

phosphate rock 1427-WOM 2. 1 14.0 -- -- -- 48.0 60.6 808.2(> I-> P-30 Mudstone, phosphatic, calcareous 1426-WOM 1. 3 13.9 -- 39.6 61.9 826.33 --.::) -- -- P-29 Mudstone 1425-WOM 1. 6 3:7 -- -- -- 59.3 63.5 832.25 

P-28 Mudstone 1424-WOM 0.9 2. 1 -- -- -- 82.0 64.4 834. 14 

P-27 Mudstone, phosphatic 1423-WOM 2.3 12.2 -- -- -- 53.4 66.7 862.20 

P-26 Mudstone, phosphatic 1422-WOM 0.6 10.0 -- -- -- 61.0 67.3 868.20 

P-25 Mudstone, phosphatic 1421-WOM 2.8 15.4 -- -- -- 42.9 70.1 911. 32 

P-24 Mudstone, phosphatic 1420-WOM 0.5 12.6 8.8 2.15 9.08 52.8 70.6 917.62 

P-23 Mudstone, phosphatic 1488-WOM 0.5 13.8 9. 8 0.76 12.14 46.1 71. 1 924.52 

P-22 Mudstone, phosphatic 1487-WOM 1. 5 14.8 9.6 0.58 9.10 47~0 72.6 946.72 

P-21 Phosphate rock, argillaceous, calcareous 1486-WOM 1.3 18.4 8.2 2.03 9.52 38.2 73.9 970.64 

P-20 Phosphate rock; fos. col. no. 48-JES-126 1485-WOM 3.2 28.5 3.6 1. 94 8. 10 15.4 11. 1 1, 061. 84 

The thicknesses of beds P-20 through P-1 are approximation due to complications by folding and are possibly accurate to within only ten 

percent. 

P-191 Mudstone, phosphatic, and argillaceous 

phosphate rock 1484-WOM 2. 5? 16.6 5.0 1. 30 11.10 41.3 79.6 1, 103. 34 

P-18 . Phosphate rock, argillaceous 1483-WOM 0.3 18.6 4.8 5.08 6.80 38. 1 79.9 1, 108. 92 

P-17 Mudstone, phosphatic 1482-WOM 1. 7? 12.3 8.5 4.12 8.20 50.2 81.6 1, 129. 83 

P-16 Mudstone, phosphatic 1481-WOM 0.6 16.1 7.7 1. 80 4.96 47.7 82.2 1, 139. 85 

P-15 Phosphate rock, argillaceous 1480-WOM 0.5 23.7 4.6 0.86 3.94 32.8 82.7 1, 151. 70 

1 Fossil collection made by J. E. Smedley, Paleontology and Stratigraphy Branch, U. S. Geological Survey. 
Bed Sample Thickness Chemical analyses (percent) Cumulative Thickness x 

no. Rock description no. (feet) P2o5 Al2o 3 Fe2o 3 

Loss on Acid thickness percent P 2o 5 ignition insoluble '{feet) (cumulative) 

P-14 Phosphate rock 1469-WOM 4. 0? 32.2 2.2 0.63 10.02 13.0 86.7 1, 280. 50 

P-13 Mudstone, phosphatic 1468-WOM 0.5 13. 7 7.9 1. 00 6.04 45.8 87.2 1, 287. 35 

P-12 Phosphate rock 1489-WOM 4.7 36.3 1. 1 0.38 3.34 5. 1 91.9 1, '457. 96 

P-11 Phosphate rock 1467-WOM 2.3 32.0 1.9 0.48 5.24 24.6 94.2 1, 531. 56 

P-10 Limestone, argillaceous, phosphatic 1466-WOM 0.3 12.4 8.2 0.68 6.00 32.0 94.5 1, 535. 28 

P- 9 Phosphate rock, argillaceous, calcareous, 

and phosphatic mudstone 1465-WOM 1. 6? 28.2 2.9 0.58 4.96 19. 7 96.1 1, 580.40 

P- 8 Mudstone, calcareous, phosphatic 1464-WOM 0.7 12. 1 12.0 4.29 9.92 37.5 96.8 1, 588. 87 

P- 7 Phosphate rock 1463-WOM 4.5 28.0 2.4 0.70 6.38 14.0 101.3 1, 714. 87 

P- 6 Phosphate rock, argillaceous 1462-WOM 0.4 24.3 4.3 0.72 6.20 37. 1 101. 7 1, 724. 59 

P- 5 Phosphate rock; fos. col. no. 48-JES-127 1461-WOM 1. 8? 32. 1 1. 3 0.46 5.04 6. 7 103.5 1, 782. 37 

P- 4 Phosphate rock, calcareous 1460-WOM 0.4? 29.9 1. 6 0.57 7.26 8. 7 103.9 1, 794. 33 

P- 3 Phosphate rock 1449-WOM 1. 1 32.2 2.6 0.48 5.74 14.7 105.0 1, 829. 75 

P- 2 Mudstone, calcareous 1448-WOM 4. 0? 1. 7 9.2 2.78 8.60 71.8 109.0 1, 836. 55 

P- 1 Phosphate rock, calcareous 1447-WOM 0.5 1.7 1. 2 7. 54 5. 20 54.9 109.5 1, 837.40 -------

Wells formation 

Cw-1 I Mudstone, calcareous 1446-WOM 3.5 4.55 
SPECTROGRAPHIC ANALYSES-SOUTH RASMUSSEN VALLEY, IDAHO •. LOT NO. 1232. 

Semi-quantitative analyses of selected samples of phosphatic shale member of PhosphoFia formation, South Rasmussen Valley, Idaho 

(see immediately preceding pages for location of section, thickness and description of strata, and chemical analyses of samples), made by 

U. S. Geological Survey Laboratory, Geochemistry and Petrology Branch, Washington, D. C. In addition to the elements listed in the table 

below, Sb, As, Be, Bi. Ce, Cs, Co, Cb, Dy, Er, Eu, Gd, Ge, Au~ Ho, Li, Lu, Nd, Pt, Pr, Rb, Sm, Sc, Ta, Te, Tb, Tl, Tm, and W were looked for in all samples but were not detected. 

Explanation of symbols 

A = more than 101 percent 

B'= 1-10 percent 

D = 0. 1-1 percent 

E = 0. 01-0.1 percent 

F = 0. 001-0.01 percent 

G = less than 0. 001 percent 

ND = not detected 

Bed Sample no. Al Ba B Cd Ca Cr Cu Fe Ga La Pb Mg Mn Mo Ni p Si Ag Na Sr Sn Ti v y Yb Zn Zr no. 

hrough P-64 not analyzed. 

P-63 B' E G E A E E D F E E D F ND F A B' G D E F E D E G E F 

P-62 D E F E A E E D ND E ND D F ND F A B' G D E F E D E G E F 

P-61 B' E G E A E E D F E F D F ND E A B' G D E ND E D E G E F 

P-60 B' E G E A E E D F F F D F ND E A B' G D E ND E D E G E F 

P-59 B' E G E A E E D F E F D F ND E A B' G D E ND E D E G E F 

P-58 B'· E G E A E E D F E F D F ND E A B' G D E F E D E G E F 

P-57 B' E G E A E E D F E F D F ND E A B' G D E F E D E G E F 

P-56 B' E F E A E E D F E F D F ND E B' A G D E ND E D E G E E 

P-55 B' E F E A E E D F F F D F ND E B' A G D E F E D E G E E 

P-54 B' E F E A E E D F F F D F ND E B' A G D E ND E D E G E E 

hrough P-25 not analyzed. 

P-24 A E F ND B' E E D F F F D F ND E B' A G D E ND D D E G E E 

P-23 A E F ND B' D E D F F ND D F ND E B' A G D E ND D D E G E E 

P-22 A E F ND B' D E D F F F D F ND E B' A G D E ND E E E G E E 

P-21 A E F ND B' E E B' F E F D F ND E B' A G D E ND E D E G E E 

P-20 B' E G F A E E D F E F D E ND E A B' G D E ND E D E G E E 

P-19 B' E F E B' D E D F E F D F ND E B' A F D E ND D D D G E E 

P-18 B' E F F B' E E B' F F F D F G E B' A F D E ND E D E G E E 

P-17 A E F F B' E E B' F F ND D F G E B' A G D E ND E D E G E E 

P-16 B' E F F B' E E D F E F D F ND E B' A F D E ND E D E G E E 

p ... 15 B' E G F B' E E D F E ND D F ND E B' A G D E ND E E E G E E 

P-14 D E. G E A E E E F E F. D F ND E A B' G D E F E n E G E E 

P-13 A E G F B' E E D F F F D F ND E B' A G D E ND D D F G E E 

P-12 D E ND E A E E E ND F F D F ND E A B' G D E F E D E G E E T • I 1 J{,i-\'.'(J~I In IE I G I;-.'.\ I,;:' c I r. •:,~o~, ;.·IF,~) I i·' •:~o· '.:.:, ., . L '' v ·' 1:' D I l. ,. 

,I r. r' -. 

1 B1 is equivalent to Band C of Bureau of Mines analyses as recorded in other repotts. 
t>:) 

0 

Bed 

no. 

P-11 

P-10 

P- 9 

P- 8 

P- 7 

P- 6 

P- 5 

P- 4 

P- 3 

P- 2 

P- 1 

Sample no. 

1467-WOM 

1466-WOM 

1464-WOM 

1464-WOM 

1463-WOM 

1462-WOM 

1461-WOM 

1460-WOM 

1449-WOM 

1448-WOM 

1447-WOM 

Al Ba 

D E 

A E 

B' E 

A E 

B' E 

B' E 

B' E 

D E 

D E 

A E 

D E 

B Cd Ca 

G E A 

G F B' 

G E A 

F F B' 

G E A 

G E A 

ND E A 

G E A 

ND E A 

F F B' 

G E A 

Cr Cu Fe Ga La Pb Mg 

E E E ND F F D 

E E D F F F D 

E E D F F F D 

E E B' F F F B' 

E E D F E F D 

E E D F E ND D 

E E E ND E F D 

E E E F E F D 

E E E F F F D 

E E B' F ND F B' 

F F B' ND E ND D 

Mn Mo Ni p Si Ag Na Sr Sn Ti v y Yb Zn Zr 

F ND E A B' G D E F E D E G E E 

F ND E B' A G D E ND D D F G E E 

F ND E A B' G D E F E D E G E E 

F F D B' A G D E ND E D E G E E 

F ND E A B' G B' E F E D E G E E/ 

E ND E A B' G B' E F E D E G E E 

F ND E A B' G B' E F E D E G E F 

F ND ·E A B' G B' E F E D E G E F 

F ND E A B' G B' E F E D E G E F 

D ND D D A G D E ND D. D F G D E 

D ND D ND B' G B' E ND E D E G E F 
1:\:) 

I-> 

TRAIL CANYON, IDAHO. LOT NO. 1206. 

Phosphatic shale member and part of Rex chert member of Phosphoria formation sampled in bulldozer trenches and from natural outcrop on north 

side of Trail Canyon, SW corner of NWiNWi sec. 30, T. 8 S., R. 43 E., Caribou County, Idaho, on west limb of Trail Creek syncline. Beds strike 

N. 12• W. and dip 55° E. Section measured by R. A. Gulbrandsen, R. A. Hoppin, V. E. McKelvey, and L. E. Smith and sampled by R. S. Sears, 

R. P. Sheldon, 0. A. Payne, and Gulbrandsen in August 1947. Samples analyzed for P 2o 5 and acid insoluble by U.S. Bureau of Mines Laboratory, 

Albany, Oregon, and for other constituents by Trace Elements Section Laboratory, U. S. Geological Survey, Washington, D. C. 

Bed Sample Thickness Cumulative Thickness x 

Rock description Acid thickness percent P 20 no. no. (feet) P2o5 insoluble (feet) ( cumulativef -~---~ -------~ --~-~--~- --------~ ~ 

Rex member of Phosphoria formation 

R- 39 Chert RAH- 241-47 8.4 0.4 -- -- -- -- 88.4 8.4 4.20 

R- 38 Chert RAH- 240-47 10.8 0.6 -- -- -- -- 87.5 19. 2 10.68 

R- 37 Chert1 silty RAH- 239-47 8.9 o. 5 -- -- -- -- 88.4 28. 1 15. 13 

R- 36 Chert RAH- 238-47 9.7 o. 6 -- -- -- -- 87.9 37.8 20.95 

R- 35 Chert. silty RAH- 237-47 0 7. 9 0.6 -- -- -- -- 88.8 45. 7 25.69 

R- 34 Mudstone RAH- 236-47 6.8 0.4 -- -- -- -- 88.2 52.5 28 .. 41 

R- 33 Mudstone RAH- 235-47 8.2 0.5 -- -- -- -- 87.0 60.7 32.51 

R- 32 Mudstone RAH- 234-47 10.0 0.5 -- -- -- -- 87.8 70.7 37.51 

R- 31 Mudstone RAH- 233-47 6.7 0.5 -- -- -- -- 85.5 77.4 40.86 

R- 30 Chert RAH- 232-47 2.9 1. 2 -- -- -- -- 86.4 80.3 44.34 

R- 29 Chert RAH- 231-47 3. 1 1.1 -- -- -- 86.1 83·. 4 47.75 

R- 28 Chert RAH- 230-47 7.4 o. 1 -- -- -- -- 90.8 90.8 48.49 

R- 27 Chert RAH- 229-47 7. 3 0.4 -- -- -- -- 94.4 98. 1 51.41 

R- 26 Chert RAH- 228-47 12.4 o. 7 -- -- -- -- 94.5 110.5 60.09 

R- 25 Chert J;l.AH- 227-47 6.0 o. 5 -- -- -- -- 94.9 116.5 63.09 

R- 24 Chert RAH- 226-47 5.6 o. 2 -- -- -- -- 94.1 122.1 64.21 

R- 23 Chert RAH-225-47 4.7 0.3 -- -- -- -- 93.7 126.8 65.62 

R- 22 Chert RAH- 224-47 6.7 0.4 -- -- -- -- 94.8 133.5 68.30 

R- 21 Chert RAH- 223-47 1. 6 o. 7 -- -- -- -- 94.7 135. 1 69.42 

R- 20 Chert RAH- 222-47 10.5 0.6 -- -- -- -- 92.9 145.6 75.72 

R- 19 Chert RAH- 221-47 8.3 0.2 -- -- -- -- 86.6 153.9 77.38 

R- 18 Chert RAH- 220-47 10.2 0.2 -- -- -- -- 89.4 164.1 79.42 

R- 17 Chert and limestone RAH- 219-47 3.6 0.3 -- -- -- -- 82.6 167. 7 80.50 

R- 16 Chert and limestone RAH- 218-47 8.7 0.6 -- -- -- -- 81.5 176.4 85.72. 

R- 15 Chert and limestone; fos. col. no. 47-HW-1521 RAH- 218-47 3.8 0.6 -- -- -- -- 82.6 180.2 88.00 

Preceding section measured along road (beds R-26 to R-39) and in cut 50 feet above road (beds R-15 to R-25); following section (beds R-1 

to R-14) measured in trench 200 feet above road. Contact between beds R-25 and R-26 {black chert and pinkish white chert) is exposed at 

road and lower cut; beds below R-15 are concealed along road and beds R-15 to R-25 are largely concealed at upper trench level. 

Thickness of beds R-15 to R-25 is 69.7 feet. but computed thickness of same sequence at upper trench is 59 feet. The larger (measured) 

figure is used in computing total thickness of Rex member. 

1 Fossil collection made by H. Wedow, Paleontology and Stratigraphy Branch, U. S. Geological Survey. 
" "' 

Bed 

no. 

R- 14 

R- 13 

R- 12 

R- 11 

R- 10 

R- 9 

R- 8 

R- 7 

R- 6 

R- 5 

R- 4 

R- 3 

R- 2 

R- 1 ----

P-210 

P-209 

P-208 

P-207 

P-206 

P-205 

P-204 

P-203 

P-202 

P-201 

P-200 

P-199 

P-198 

P-197 

P-196 

Rock description 

Limestone, cherty 

Chert 

Limestone, locally cherty 

Chert, contains scattered 

limestone concretions 

Chert, contains limestone 

concretions and lenses 

Limestone, locally cherty 

Chert, contains thin limestone 

lenses 

Limestone, argillaceous 

Chert, contains thin limestone 

lenses 

Limestone, contains cherty 

limestone beds 

Chert 

Limestone, argillaceous 

Chert 

Chert, contains mudstone layers -------- - --- --

Mudstone, phosphatic; fos. col. 

no. 47-HW-122 

Phosphate rock, argillaceous; 

fos. col. no. 47-HW-172 

Mudstone 

Mudstone, phosphatic 

Mudstone 

Mudstone; fos. col. no. 47-HW-123 

Mudstone.~ argillaceous; fos. col. no. 47-HW-124 

Mudstone, calcareous, possibly 

concretionary 

Mudstone, possibly concretionary; 

fos. col. no. 47-HW-153 

Limestone, argillaceous; fos. 

col. no. 47-HW-154 

Mudstone; fos. col. no. 47-HW-154 

Phosphate rock, argillaceous; 

fos. col. no. 47-HW-173 

Mudstone 

Phosphate rock 

Phosphate rock 

Sample Thickness Chemical analyses (percent 

no. (feet) P2o5 Al2o 3 Fe2o 3 F Loss on 

ignition 

RAH- 213-47 0.9 0.4 -- -- -- -- RAH- 212-47 3. 1 0.7 -- -- -- -- RAH- 211-47 0.7 o. 3 -- -- -- --

RAH- 210-47 8. 1 0.6 -- -- -- --

RAH- 209-47 6.4 0.6 -- -- -- --

RAH- 208-47 0.8 o. 2 -- -- -- --

RAH- 207-47 5.7 0.4 -- -- -- -- RAH- 206-47 1.3 0.6 -- -- -- -- RAH- 205-47 3.3 o. 7 -- -- -- --

RAH- 204-47 2.0 o. 7 -- -- -- --

RAH- 203-47 5.6 o. 8 -- -- -- -- RAH- 202-47 3.3 0.6 -- -- -- -- RAH-201-47 4.0 o. 8 -- -- -- -- RAH- 200-47 2.7 o. 7 -- -- -- -- --- __ , __ 

Phosphatic shale member of Phosphoria formation 

VEM-274-47 0.3 8. 0 -- -- -- -- VEM-273-47 0.4 26.6 -- -- -- -- VEM-272-47 0.9 1.4 -- -- -- -- VEM-271-47 0.7 8.8 -- -- -- -- VEM-270-47 0.9 1. 8 -- -- -- -- VEM-269-47 0.7 2. 2 -- -- -- -- VEM-268-47 2.9 0.2 -- -- -- --

VEM-267-47 0.7 1. 1 -- -- -- -- VEM-266-47 1.4 1.3 -- -- -- -- RAG- 6-47 1.24 2. 4 -- -- -- --

RAG- 5-47 1.65 3. 2 -- -- __ , 

-- RAG- 4-47 0.73 23.1 -- -- 2.14 -- RAG- 3-47 0.71 6.9 -- -- 1. 09 -- RAG- 2-47 1. 15 28.6 1.6 0.80 2.75 9.64 

RAG- 1-47 0.68 28.0 2.3 0.98 2.90 8.86 

Cumulative Thickness x 

Acid thickness percent P 2 0 

insoluble (feet) ( cumulatlve r 

42.9 181. 1 88.36 

81.9 184.2 90.53 

28.5 184.9 90.74 

73.3 193.0 95.60 

86.2 199.4 99.44 

31.0 200.2 99.60 

77.7 205.9 101.88 

30.5 207.2 102.66 

88.7 210.5 104.97 i 

45.5 212. 5 106.37 

85.8 218. 1 110.85 

32.9 221.4 112.83 

90.5 225.4 116.03 

87.8 228.1 117.92 ---------------- .. ----- ~--

68.1 0.3 2.40 

21.5 0.7 13.04 

77.5 1.6 14.30 

57.9 2.3 20.46 

75. 1 3.2 22.08 

70.6 3.9 23.62 

53.9 6.8 24.20 

67.0 7. 5 24.97 

78.4 8.9 26.79 

39.8 10. 14 29.67 

72.6 11. 79 35.11 

25.5 12.52 51.28 

56.7 13.23 56.19 

9.4 14.38 89. 08 . 

12.9 15.06 108.13 
·. P-19 51 Phosphate rock I VEM-265-47 I 0.6 I 36.1 I 0.7 I o. ss I 3. 65 I 4.18 I 3. 2 I 15.66 I 130.15 · P-194 Phosphate rock VEM-264-47 0.8 31.6 1. 9 1. 3 3. 04 5.22 11. 7 16.46 155.43 

P-193 Phosphate rock:~ contains 

phosphatic limestone concretion 

0. 2 foot thick VEM-263-47 0.6 33.9 1.1 o.so 3.23 5.22 6.7 17.06 

I 

175.86 

P-192 Mudstone VEM-262-47 0.3 2. 7 9.8 3.7 0.31 10.14 70.2 17.36 176.67 

P-191 Phosphate rock VEM-259-47 1.0 30.6 1.5 0.97 2.97 5.02 14.6 18.36 207.27 

P-190 Limestone VEM-258-47 1.0 2. 7 1.4 0.80 -- 35.88 12.0 19.36 

I 

209.97 

P-189 Mudstone VEM-257-47 0.4 0.3 1.4 0.68 -- 9.58 83.0 19. 76 210.09 

P-188 Phosphate rock VEM-256-47 0.6 34.0 0.8 0.61 3.27 6. 18 5. 7 20.36 230.49 

Phospha4e rock, calcareous, 

concretion in bed P-188 VEM-255-47 (0. 0-0. 4) 23.5 0.8 0.45 2.26 16.14 

I 

7-.3 

P-187 I Phosphate rock and phosphatic 

mudstone; fos. col. no. 47-HW-155 VEM-254-47 0.3 16.4 6.0 2.0 1. 61 10. 12 36.3 I 20.66 I 235.41 

P-186 I Phosphate rock, calcareous, 

contains phosphatic mudstone 

concretions; fos. col. no. 

47-HW-156 VEM-253-47 0.6 

120.91 1.8 I 0.66

1

2.06

1

19.68 

I 

9.3 

I 

21. 26 

I 

247.95 

P-185 I Phosphate rock, argillaceous VEM-252-47 0.4 20.0 3.8 1.3 2.06 12.16 25.5 21.66 255.95 

P-184 Phosphate rock, calcareous VEM-251-47 0.8 23.5 0.8 o. 91 2. 22 15.96 7. 3 22.46 274. 75 

Limestone concretion; fos. col. -no. 4 7-HW-157 VEM-250-47 (0. 0-0. 7) 1. 6 I -- I -- I -- I -- I 11.4 

P-183 Mudstone, calcareous, phosphatic; 

fos. col. no. 47-HW-158 VEM-249-47 1.2 9. 1 -- -- -- -- 42.8 23.66 285.67 M 

c,., 

P-182 Mudstone; fos. col. no. 47-HW-159 VEM-248-47 0.5 3. 1 -- -- -- -- 50.9 24. 16 281.22 

P-181 Mudstone; fos. col. no. 47-HW-160 VEM-247-47 0.8 3.9 -- -- -- -- 61.4 24.96 290.34 

P-180 Mudstone; fos. col. no. 47-HW-161 VEM-246-47 1. 1 3. 3 -- -- -- -- 63. 1 26.06 293.97 

P-179 Mudstone; fos. col. no. 47-HW-162 VEM-245-47 1.0 3. 5 -- -- -- -- 65.3 27.06 297.4 7 

P-178 Phosphate rock, argillaceous VEM-244-47 0.6 16.2 -- -- -- -- 31.6 27.66 307.19 

P-177 Mudstone, phosphatic VEM-243-47 1.0 15.7 -- -- -- -- 41.8 28.66 322.89 

P-176 Phosphate rock VEM-242-47 0.5 33.6 -- -- -- -- 3.8 29.16 339.69 

P-175 Phosphate rock, argillaceous, 

and calcareous mudstone VEM-241-47 0.8 25.5 -- -- -- -- 14.8 29.96 360.09 

P-174 Phosphate rock, calcareous, 

argillaceous; fos. col. nos. 

I I I I I 

47-HW-163 and 47-HW-164 VEM-240-47 0.8 18. 7 I -- -- -- -- 23. 1 30.76 I 375.05 

P-173 Phosphate rock, calcareous; 

fos. col. no •. 47-HW-165 VEM-239-47 0.7 17.2 -- -- -- -- 14. 2 31.46 I 387.09 

P-172 Limestone, phosphatic, 

argillaceous; fos. col. no. 47-HW-166 I VEM-238-47 I 0.4 I 12. 1 I -- I -- I -- I -- I 23.4 I 31.86 I 392.17 

P-171 I Phosphate rock, calcareous, 

argillaceous; fos. col. no. I VEM-261-47 47-HW-167 I 0.6 I 16.6 I -- I -- I -- I --- I 20. 1 I 32.46 I 402.13 

P-1 70 I Phosphate rock, calcareous.-

argillaceous; fos. col. no. 47-HW-168 I LES- 356-4 7 I 0.4 I 16. 3 I -- I -- I -- I -- I 21.4 I 32.86 I 408.65 
~ 

.,p.. 

Bed 

no. 

--

P-169 

P-168 

--

P-167 

P-166 

P-165 

P-164 

P-163 

P-16Z 

P-161 

P-160 

P-159 

P-158 

P-157 

P-156 

P-155 

P-154 

P-153 

P-152 

P-151 

P-150 

P-149 

Sample Thickness Chemical analyses (percent 

Rock description no. (feet) PzOs Al2o3 Fe2o3 F Loss on Acid 

ignition insoluble 

Limestone VEM-260-47 (o. o-o. 3} 6. 0 -- -- -- -- 7.6 

VEM-Z60 represents two concretions of O. 0-0.3 and o. 0-0.2 foot thickness in beds P-171 and P-170 respectively. 

Phosphate rock, calcareous, 

argillaceous, contains 

calcareous concretions; 

fos. col. no. 47-HW-169 LES- 355-47 0.75 Zl. 0 -- -- -- -- Zl. 0 

Phosphate rock, calcareous; 

fos. col. no. 47-HW-170 LES- 349-47 0.6 16.6 -- -- -- -- 19.5 

Limestone concretion in bed 

P-168 _ LES- 350-47 (0. 45) 1. 3 -- -- -- -- 1. 9 

Limestone, phosphatic, 

argillaceous; fos. col. no. 47-HW-171 LES- 348-4 7. 0.4 10.8 -- -- -- -- 26.0 

Limestone, argillaceous, 

phosphatic LES- 34 7-4 7. 0.55 8. 9 -- -- -- -- 29. 1 

Limestone, phosphatic, 

argillaceous; fos. col. no. 47-HW-88 LES- 346-47 0.75 15. 2 -- -- -- -- 19.9 

Phosphate rock, calcareous LES- .345-4 7 0.55 18.2 -- -- -- -- 13.2 

Phosphate rock, calcareous LES- 344-47 0.6 18.0 -- -- -- -- 19. 1 

Phosphate rock, calcareous, 

argillaceous LES- 343-47 0.6 15.5 -- -- -- -- 29.8 

Phosphate rock, calcareous, 

argillaceous LES- 342-47 0.65 15.3 -- -- -- -- 22.6 

Phosphate rock, calcareous, 

argillaceous LES- 341-47 0.7 17.8 -- -- -- -- 20.3 

Phosphate rock, calcareous, 

argillaceous LES- 340-47 0.6 18.7 -- -- -- -- 22.7 

Phosphate rock,. calcareous, ... 

argillaceous LES- 339-47 o.s 18.8 -- -- -- -- 25.9 

Phosphate rock, calcareous, 

argillaceous, contains limestone 

concretions LES- 338-47 0.55 14.8 -- -- -- -- 21.5 

Phosphate rock, calcareous, 

argillaceous LES- 337-47 0.6 16.9 -- -- -- -- 27.9 

Phosphate rock, argillaceous LES- 336-47 0.55 16.4 -- -- -- -- 31.0 

Mudstone, phosphatic LES- 335-47 0.6 14.7 -- -- -- -- 39.6 

Mudstone, phosphatic LES- 334-47 0.6 15.4 -- -- -- -- 40. 1 

Mudstone, phosphatic LES- 333•47 o.s 1Z. 8 -- -- -- -- 44.1 

Mudstone, phosphatic . LES- 33Z-4 7 0.6 11. 1 -- -- -- -- 48.4 

Limestone, argillaceous LES- 331-47 0.65 4.9 -- --

I 

-- -- 39.2 

Limestone; fos. col. no. 47-HW-87 LES- 330-47 1. 3 0.9 -- -- -- -- 29.6 

Cumulative Thickness x 

thickness 

(feet) 

percent P 0 

( cumulati~e)S 

-- --

33.61 425.45 

34.21 435.41 

-- --

34:-61 439.73 

35. 16 444.63 

35.91 456.03 

36.46 466.03 

37.06 476.83 

37.66 486. 13 

38.31 496.08 

39.01 508. 54 

39.61 519. 76 

40.11 529.16 

40.66 537.30 

41.26 547.44 

41.81 556.46 

42.41 565.28 

43.01 574. 52 

43.51 580.92 

44.11 587.58 

44.76 590.77 

46.06 591.94 
P-148 !4udstone, calcareous VEM-237-47 0.4 3. 9 -- -- -- -- 49.6 46.46 593.90 

P-147 Mudstone, phosphatic VEM-236-47 1.3 12.9 -- -- -- -- 45.0 47.76 610.27 

P-146 Mudstone, phosphatic VEM-235-47 1. 4 12.4 -- -- -- -- 47.0 49.16 627.63 

P-145 Phosphate rock, argillaceous VEM-234-47 0.4 16.9 -- -- -- -- 41.3 49.56 634.39 

P-144 Mudstone VEM-233-4.7 1.1 7. 7 -- -- -- -- 61.9 50.66 642.86 

P-143 Mudstone VEM-232-47 1. 6 6. 5 -- -- -- -- 65.2 52.Z6 653.26 

P-142 Mudstone;· fos. col. no. 47-HW-86 VEM-231-47 1.6 3. 9 -- -- -- -- 74. 1 53.86 659. 50 

P-141 Mudstone VEM-230-47 1. 6 4.6 -- -- -- -- 72. 1 55.46 666.86 

P-140 Mudstone VEM-229-47 1.0 6.2 -- -- -- -- 73.2 56.46 673.06 

P-139 Mudstone, phosphatic VEM-228-47 0.3 13.4 -- -- -- -- 54.8 57.76 677.08 

P-138 Mudstone 'VEM-227-47 1.8 2.8 -- -- -- -- 85.7 58.56 682. 12 

P-137 Phosphate rock, argillaceous VEM-226-47 0.6 19.9 -- -- -- -- 39.7 59. 16 694.06 

P-136 Mudstone VEM-225-47 1. 6 2.8 -- -- -- -- 82.2 60.76 698.54 

P-135 Mudstone VEM-224-47 1.4 3. 5 -- -- -- -- 79.6 62.16 703.44 

P-134 Mudstone, phosphatic VEM-223-47 0.8 14.0 -- -- -- -- 51.0 62.96 714.64 

P-133 Mudstone, phosphatic VEM-222-47 0.5 12. 1 -- -- -- -- 54.6 63.46 720.69 

P-132 Mudstone VEM-221-47 1.5 6.8 -- -- -- -- 69.8 64.96 730.89 

P-131 Mudstone; fos. col. no. 47-HW-85 VEM-220-47. 1.7 4.4 -- -- -- -- 76.0 66.66 738.37 

P-130 Mudstone VEM 219-47 2.8 4.3 -- -- -- -- 77.0 69.46 750.41 

P-129 Mudstone VEM-218-47 1. 4 0.8 -- -- -- -- 87. 7 70.86 751.53 

P-128 Mudstone VEM-217-47 1. 9 4. 1 -- -- -- -- 77.2 72.76 759.32 

P-127 Mudstone and phosphate rock VEM-216-47 1. 3 16.8 -- -- -- -- 42.9 74.06 781. 16 

P-126 Mudstone VEM-215-47 0.5 6. 0 -- -- -- -- 70.7 74.56 784. 16 

P-125 Mudstone, phosphatic VEM-214-47 0.8 10.7 -- -- -- 59.4 75". 36 792.72 

P-124 Mudstone; fos. col. no. 47-HW-84 VEM-213-47 2.6 2. 0 -- -- -- -- 79.4 77.96 797.92 

P-1231 Mudstone · VEM-212-47 2. 1 I. 7 -- -- -- -- 81.4 80.06 I 801.49 

P-122 Mudstone, phosphatic and . phosphate rock VEM-211-47 0.6 17.2 -- -- -- -- 43.3 80.66 811. 81 

P-121 Mudstone VEM-210-47 0.8 6. 9 -- -- -- -- 68.2 81.46 817.33 

P-120 Mudstone, phosphatic VEM-209-47 1.9 9. 2 -- -- -- -- 56.2 83.36 834.81 

P-119 Phosphate rock, argillaceous VEM-208-47 1. 8 17. Q -- -- -- -- 42.4 85.16 865.41 

P-118 Mudstone VEM-207-47 0.7 4.0 -- -- -- -- 74.1 85.86 868.21 

P-117 Mudstone VEM-206-47 2.3 5. 9 -- -- -- -- 72.8 88.16 881.78 

P-116 Limestone, argillaceous VEM-205-47 2.1 o. 2 -- -- -- -- 30.8 90.26 882.20 

P-115 Mudstone VEM-204-47 1.1 0.4 -- -- -- -- .81.2 91.36 882.64 

P-114 Phosphate rock VEM-203-47 0.3 22.5 -- -- -- -- 7. 9 91.66 889.39 

P-113 Mudstone VEM-202-47 1.7 2. 2 -- -- -- -- 80.0 93.36 893.13 

P-112 Mudstone VEM-201-47 0.4 5. 8 -- -- -- -- 78.7 93.76 895.45 

Pill Limestone, argillaceous VEM-200-47 1.5 1. 1 -- -- -- -- 46.6 95.26 897. 10 

P-110 Mudstone VEM-199-47 0.7 1. 2 -- -- -- -- 84.0 95.96 897.94 

P-109 Phosphate rock, argillaceous VEM-198-47 0.3 29.2 -- -- -- -- 20.2 96.26 906. 70 

P-108 Mudstone VEM-197-47 0.9 2. 1 -- -- -- -- 79.3 97.16 908. 59 

P-107 Mudstone, phosphatic VEM-196-47 .o. 3 14.3 -- -- -- -- 48.0 97.46 912.88 

P-106 Mudstone VEM-195-47 o.s 2. 2 -- -- -- -- 80.6 97.96 913.98 

P-105 Mudstone VEM-194-47 1. 1 1. 2 -- -- -- -- 82.3 99.06 915.30 
1:\:) 

(j.) 

Bed 

no. 

P-104 

P-103 

P-10Z 

P-101 

P-100 

P- 99 

P- 98 

P- 97 

P- 96 

P- 95 

P- 94 

P- 93 

P- 9Z 

P- 9i 

P- 90 

P- 89 

P- 88 

P- 87 

P- 86 

P- 85 

P- 84 

P- 83 

P- 8Z 

p .. 81 

P- 80 

P- 79 

P- 78 

P- 77 

P- 76 

P- 75 

P- 74 

P- 73 

P- 7Z 

P- 71 

P- 70 

Rock description 

Mudstone 

Mudstone 

Mudstone; fos. col. no. 47-HW-83 

Phosphate rock, argillaceous 

Mudstone 

Phosphate rock, ar~illaceous 

Mudstone, phosphatic 

Phosphate rock, argillaceous, and 

phosphatic mudstone 

Mudstone 

Phosphate rock, argillaceous 

Mudstone 

Mudstone 

Mudstone; fos. col. no. 47-HW-SZ 

Mudstone, phosphatic and chert 

Mudstone 

Mudstone, phosphatic, contains 

chert nodules 

Mudstone 

Mudstone, contains chert nodules 

Mudstone; fos. col. no. 47-HW-81 

Phosphate rock, argillaceous 

Mudstone, phosphatic 

Mudstone 

Mudstone, phosphatic 

Mudstone 

Mudstone and phosphate rock 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone, calcareous 

Mudstone, calcareous, phosphatic 

Limestone, argillaceous, 

phosphatic 

Limestone, argillaceous, 

phosphatic 

Mudstone, contains limy 

concretions 

Limestone, argillaceous 

Phosphate rock and calcareous 

mudstone 

Sample Thickness 

no. (feet) Pz05 

VEM-193-47 0.7 1. z 

VEM-19Z-47 0.6 4.4 

VEM-191-47 0.9 o. 7 

VEM-190-47 0.5 zo. 4 

VEM-189-47 0.6 1. 6 

VEM-188-47 0.3 Z6.5 

VEM-187-47 0.5 11.0 

VEM-186-47 0.5 19.Z 

VEM-185-47 Z.3 5. 5 

VEM-184-47 0.5 Z4.0 

VEM-183-47 1. 6 o. 7 

VEM-18Z-47 0.9 6. 7 

VEM-181-47 3.4 1. 6 

LES- 3Z9-47 0.3 14.Z 

LES- 3Z8-47 z.o 1. 7 

LES- 3Z7-47 0.4 14.7 

LES- 3Z6-47 0.75 1. z 

LES- 3Z5-47 0.4 7. 0 

LES- 3Z4-47 z.o o. 6 

LES- 3Z3-47 0.75 . 17. 7 

LES- 3ZZ-47 1. 45 14.9 

LES- 3Z1-47 0.55 6.Z 

LES- 3Z0-47 1. 0 8. 1 

LES- 319-47 1. 0 1. 6 

LES- 318-47 0.75 6.0 

LES- 317-47 1. 6 10.8 

LES- 316-47 1.0 lZ. 4 

LES- 315-47 0.65 11. z LES- 314-47 1. z 6. 6 

LES- 313-47 0.7 8.3 

LES~ 31Z-47 1. 0 9.0 

LES- 311-47 0.75 8. 5 

LES- 310-47 0.9 7. 3 

LES- 309-47 z.z 6.3 

LES- 308-47 0.35 10.4 

Chemical analyses {percent) Cumulative Thickness x 

A1z0 3 Fez03 F Loss on Acid thickness percent P2 0 

ignition insoluble (feet) (cumulatlvef 

-- -- -- -- 81. z 99.76 916. 14 

-- -- -- -- 71.6 100.36 918.78 

-- -- -- -- 83.7 10l.Z6 919.41 

-- -- -- -- 35.3 101. 76 9Z9.61 

-- -- -- -- 70.1 10Z.36 930.57 

-- -- -- -- Z3.8 10Z.66 938.5Z 

-- -- -- -- 56. 1 103.16 944.0Z 

-- -- -- -- 33.7 103.66 · 953. 6Z 

-- -- -- -- 75. 5 105.96 966.Z7 

-- -- -- -- zs. 1 106.46 978.Z7 

-- -- -- -- 88. 1 108.06 979.39 

-- -- -- -- 68.5 108.96 985.4Z 

-- -- -- -- 84.6 liZ. 36 990.86 

-- -- -- -- 50.5 liZ. 66 995. 1Z 

-- -- -- -- 8Z.6 114. 66 998.5Z 

-- -- -- -- 46.9 115.06 1,004.40 

-- -- -- -- 86.5 115. 81 1, 005. 30 

-- -- -- -- 70. 7 116. Z1 1, 008. 10 

-- -- -- -- 88.5 118. Z1 1,009.30 

-- -- -- -- 34.1 118.96 1, ozz. 58 

-- -- -- -- 43.9 1Z0.41 1, 044. 18 

-- -- -- -- 68.9 1Z0.96 1, 047. 59 

-- -- -- -- 59.6 1Zl.96 1,055.69 

-- -- -- -- 84.0 1ZZ.96 1, 057. Z9 

-- -- -- -- 60.4 1Z3. 71 1, 061. 79 

-- -- -- -- 5Z.O 1Z5. 31 1, 079. 07 

-- -- -- -- 37.3 1Z6.31 1, 091. 47 

-- -- -- -- 45.7 1Z6.96 1, 098. 75 

-- -- -- -- 43.5 1Z8.16 1, 106. 67 

-- -- -- -- 38.7 1Z8.86 1, llZ. 48 

-- -- -- -- Z6. 3 1Z9.86 1,1Zl.48 

-- -- -- -- Z4.7 130.61 l,lZ7. 86 

-- -- -- -- 31.4 131.51 1, 134. 4Z 

-- -- -- -- Z7. 8 133.71 1, 148. Z8 

-- -- -- -- 40.4 134.06 1, lSI. 9Z 
P- 69 !4udstone, calcareous LES- 307-47 2.0 5. 1 -- -- -- -- 46.0 136.06 1, 162. 12 

P- 68 Limestone and calcareous 

mudstone; fos. col. no. 47-HW-80 LES- 306-47 1. 35 0.4 -- -- -- -- 10.0 137.41 1, 162. 66 

P- 67 Limestone and calcareous 

mudstone;fos. col. no. 47-HW-79 LES- 305-47 2.2 0.6 -- -- -- -- 10.3 139.61 1, 163.98 

p.. 66 Chert and mudstone LES- 304-47 0.65 1. 3 -- -- -- -- 78.4 140.26 1, 164. 83 

P- 65 !4udstone, calcareous LES- 303-47 1. 9 2.3 -- -- -- -- 58.6 142. 16 1, 169. 20 

P-. 64 Mudstone LES- 302-47 0.6 0.4 -- -- -- -- 80.5 142.76 1, 169. 44 

P- 63 Mudstone LES- 301-47 0.6 2. 4 -- -- -- . -- 73.4 143.36 1,170.88 

P- 62 Mudstone, phosphatic LES- 300-47 0.6 7. 8 -- -- -- -- 54.8 143.96 1, 175.56 

P- 61 Limestone LES- 299-47 0.7 2. 2 -- -- -- -- 16.9 144.66 1,177.10 

P- 60 Mudstone LES- 298-47 1. 5 5. 0 -- -- -- -- 66.5 146.16 1, 184. 60 

P- 59 Mudstone, calcareous LES- 297-47 1.0 5. 6 -- -- -- -- 54.7 147. 16 1, 190. 20 

P- 58 Mudstone, calcareous LES- 296-47 0.9 1. 0 -- -- -- -- 68.1 148.06 1, 191. 10 

P- 57 Mudstone LES- 295-47 0.8 1. 7 -- -- -- -- 80.7 148.86 1,192.46 

P- 56 Mudstone, calcareous LES;.. 294-47 0.9 7. 0 -- -- -- -- 54.3 149.76 1, 198. 76 

P- 55 Mudstone, contains mudstone 

lenses; fos. col. no. 47_-HW-78 LES- 293-47 0.55 7.4 -- -- -- -- 59.9 150. 31 1, 202. 83 

P- 54 I Mudstone, phosphatic, calcareous LES- 291-47 1. 6 11.2 -- -- -- -- 47.8 151. 91 1, 220. 75 

Limestone concretion in bed 

P-54 LES- 292-47 (0. 8) o. 6 -- -- -- -- 3.3 

P- 531 Mudstone, calcareous LES- 290-47 0.4 4.5 -- -- -- -- 66.5 152.31 1, 222. 55 

P-52 Mudstone LES.: 289-47 0.4 4.9 -- -- -- -- 67.5 152.71 1, 224. 51 1::\:) P- 51 Mudstone, calcareous, and -..::1 calcareous phosphate rock LES- 288-47 0.6 6.2 -- -- -- -- 58.3 153.31 1, 228. 23 

P- 50 I Mudstone, calcareous; fos. col. no. 47-HW-77 LES- 287-47 1.0 4.5 -- -- -- -- 65.6 154.31 1, Z32. 73 

P- 49 I Mudstone, calcareous, phosphatic LES- 286-47 2.25 9.4 -- -- -- -- 41.0 156.56 1, 253. 88 

P- 48 Limestone, phosphatic, 

argillaceous LES- 285-~7 0.45 9.0 -- -- -- -- 20.9 157.01 1,257.93 

Limestone concretion in bed 

P-47 LES- 284-47 (0. 8) 1. 1 -- -- -- -- 1. 7 

P- 4 7 I Limestone, phosphatic, 

argillaceous LES- 283-47 0.8 ll. 7 -- -- -- -- 26.4 157. 81 1, 267. 29 

P- 46 I Mudstone, calcareous, phosphatic LES- 282-47 0.5 ll. 5 -- -- -- -- 38.3 158.31 1, 273. 04 

P- 45 Mudstone, calcareous, phosphatic; 

fos. col. no. 47-HW-76 LES- 281-47 1. 05 8. 9 -- -- -- -- 39.3 159.36 1, 282. 38 

P- 44 I Limestone, argillaceous; fos. col. no. 47-HW-75 LES- 280-47 1.0 o. 5 -- -- -- -- 21.3 160.36 1, 282.88 

P- 43 I Mudstone, calcareous, phosphatic LES- 279-47 0.4 9.9 -- -- -- -- 42.8 160.76 1, 286. 84 

P- 42 Mudstone, calcareous LES- 268-47 0.4 4.0 -- -- -- -- 45.0 161. 16 1, 288.44 

P- 41 I Mudstone, phosphatic LES- 267-47 1. 1 ll. 7 -- -- -- -- 48.9 162.26 1,301.32 

P- 40 Mudstone, phosphatic, calcareous · LES- 264-47 4.2 14~1 -- -- -- -- 38.7 166.46 1, 360. 54 

Limestone concretion in bed 

P-40 LES- 266-47 (o. 5) i.3 -- -- -- -- 8. 5 

Limestone concretion in bed 

P-40 LES- 265-47 (0.1) 4. 6 -- -- -- -- 14.3 
M 

(X) 

Be~ 

no. 

p .. 39 

P- 38 

P- 37 

P- 36 

P- 35 

P- 34 

P- 33 

P- 32 

P- 31 

P- 30 

P- Z9 

P- Z8 

P- 21 

P- Z6 

P- 25 

P- Z4 

P- Z3 

P- ZZ 

P- Z1 

P- ZO 

P- 19 

P- 18 

P- 17 

P- 16 

P- 15 

P- 14 

P- 13 

P- 1Z 

P- 11 

P- 10 

P- 9 

P- 8 

Rock description 

Mudstone, calcareous. phosphatic 

Mudstone, calcareous, phosphatic 

Phosphate rock and calcareous 

mudstone 

Phosphate rock. contains 

laminations of calcareous 

mudstone 

Mudstone and phosphate rock 

Phosphate rock, calcareous 

Limestone, contains phosphate 

rock lenses 

Phosphate rock, calcareous 

Phosphate rock and mudstone; 

fos. col. no. 47-HW-174 

Phosphate rock and phosphatic 

mudstone 

Limestone 

Mudstone, phosphatic 

Limestone 

Limestone 

Phosphate rock, argillaceous 

Phosphate rock, calcareous, and 

calcareous phosphatic mudstone 

Phosphate rock and phosphatic 

calcareous mudstone 

Phosphate rock, argillaceous 

Mudstone and phosphate rock 

Mudstone 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock, argillaceous 

Phosphate rock, argillaceous 

Phosphate rock and phosphatic 

mudstone 

Phosphate rock, argillaceous; 

fos. col. no. 47-HW-74 

Phosphate rock, argillaceous 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Sample Thickness 

no. (feet) Pz05 

LES- 263-47 0.6 11.3 

LES- 26Z-47 0.65 12. 1 

LES- 261-47 Z.5 15.8 

LES- 260-47 1. 0 23.1 

LES- 259-47 0.55 24.5 

LES- 278-47 0.5 Z8.8 

LES- 277-47 0.8 8. z LES- 276-47 0.55 Z4.2 

LES- 275-47 1.15 28.4 

LES- Z74-47 0.6 18.4 

LES- 273-47 3.Z 4.6 

LES- 27Z-47 1. 75 11.0 

LES- Z71-47 0.9 3. 0 

LES- 270-47 Z.85 3. 8 

LES- 269-47 0.6 21.8 

LES- 248-47 1. 45 29.6 

LES- 247-47 0.5 29.4 

LES- 246-47 0.55 25. 1 

LES- 245-47 1.1 18.8 

LES- Z44-47 0.4 6.7 

VEM-180-47 1. 0 33. 1 

VEM-179-47 1.4 Z7. 8 

VEM-178-47 0.9 31.8 

VEM-177-47 1. 3 Z6.Z 

VEM;.l76-47 1. z 21.9 

VEM-175-47 0.6 16.3 

RAH-189-47 2.5 Z4.0 

WOM- 318Z 1. 35 Z5.4 

WOM- 3181 2. 1 33.0 

RAH- 186-47 1. 9 33 •. 3 

RAH-185-47 1. 7 35.0 

RAH-184-47 0.4 Z6.8 

Chemical analyses (percent Cumulative Thickness x 

Loss on Acid thickness percent PzO Al20 3 Fe2o3 F ignition insoluble (~eet) (cumulative )5 

-- -- -- -- 41.3 167.06 1, 367.32 

-- -- -- -- 36.1 167.71 1, 375. 18 

-- -- -- -- Z3.7 170. Z1 1. 414. 68 

-- -- -- -- 17.4 171.21 1,437. 78 

-- -- -- -- 22.3 171.76 1, 451. Z6 

-- -- -- -- 4.6 172.Z6 1, 465. 66 

-- -- -- -- 10.4 173.06 1, 472. zz 

-- -- -- -- 13.4 173. 61 1, 485. 5Z 

-- -- -- -- 1Z. 9 174. 76 1, 518. 18 

-- -- -- -- 34.5 175.36 1, 5Z9. ZZ 

-- -- -- -- 13. 7 178.56 1, 543. 94 

-- -- -- -- 46.1 180.31 1, 563. zo 

-- -- -- -- 15.0 181. Z1 1, 565.90 

-- -- -- -- 18.7 184.06 1, 576. 7Z 

4.5 1. 6 1. 99 7.36 Z9.9 184.66 1, 589.80 

Z.3 1. z 2.82 7.38 14.4 186. 11 1, 63Z. 7Z 

Z.2 1.1 2.67 6. 18 16. 5 186.61 1, 647. 4Z 

3.3 1. 5 z.z5 6.74 Z6. 1 187. 16 1. 661. Z3 

6.4 Z.2 1. 62 6.84 43.Z 188.Z6 1, 681. 91 

9.40 2. 97 0.57 5.92 70.Z 188.66 1, 684. 59 

1.3 0.58 2.49 6.16 8.6 189.66 1, 717. 69 

z. 8 1. 1 z.56 6. 7o 18.9 191.06 1, 756. 61 

1. 7 0.91 Z.84 5.96 10.4 191.96 1, 785. Z3 

Z.7 1. z Z.64 6.90 zo. 6 193.Z6 1, 819. Z9 

5.4 1.9 1. 9Z 7.48 31.4 194.46 1, 845. 57 

7.3 1.9 1. 43 9.44 39.9 195. 06 1, 855. 35 

3.9 1. 5 Z.08 5.76 Z6.3 197.56 1,915.35 

1.3 0.55 3.Z5 6.Z4 Z5.5 198.91 1, 949.64 

3.5 1. 7 Z.55 5.Z4 6.9 201.01 1, 018. 94 

0.7 0.5Z 3.40 6.Z4 4.3 ZOZ.91 Z, 08Z. Z1 

-- -- 3.60 -- 3.0 Z04.61 z. 141. 71 

Z.3 1. 0 Z.7Z 6.18 18.0 Z05. 01 Z, 15Z. 43 
[:\!) 

co 

P- 7 Phosphate rock RAH- 183-47 0.55 Z8. 3 z.z 0.95 Z.39 6.46 16.6 Z05.56 

P- 6 Mudstone RAH-18Z-47 Z.l z. 5 11.6 3.0 -- 10.Z4 68.4 Z07.66 

P- 5 Mudstone RAH- 181-47 1.0 o. 8 11.6 3.4 -- 6.56 77.8 Z08.66 

P- 4 Limestone, argillaceous RAH- 180-47 0.4 0.6 4.5 1. 7 -- 31.Z8 30.3 Z09.06 

P- 3 Mudstone. calcareous RAH-179-47 0.5 3. 9 8.8 6.3 -- 9.36 56.3 Z09.56 

P- z Phosphate rock RMC-133-47 1. 1 30. z z. z 1. 4 -- 5.66 1Z. 8 Z10.66 

P- 1 Phosphate rock RMC-134-47 0.5. 31.4 1. 3 0.75 -- 4.48 9.9 Zll. 16 

Wells formation 

Cw- 1 j Li~=~one --·---------l RAH-177-471 z.o ~--~~z l -- I -::-~ -- I -- -l 4. 7 j =--~ 

z. 168. 00 

Z, 173. Z4 

z. 174.04 

z, 174. Z8 

Z, 176.Z4 

z.zo9.46 

z, ZZ5. 16 
<:..:l 

0 

SPECTROGRAPIDC ANALYSES-TRAIL CANYON,. IDAHO. LOT NO. 1206. n 

Semi-quantitative analyses of selected samples of the phosphatic shale member of the Phosphoria formation,. Trail Canyon,. Idaho {see 

immediately preceding pages for location of section, thickness,and description of strata, and chemical analyses of samples), made by 

U. S. Geological Survey Laboratory,. Geochemistry and Petrology Branch, Washington,. D. C. In addition to the elements listed in the table 

below, Sb, As, Bi,. Cs, Cb, Dy, Er, Eu, Ga,. Gd, Au,. Ho, In, Li, Lu, Nd,. Pt, Pr, Rb, Sm, Sc,. Ta, Te, Tb,. Tl. Tm, W, and Yb were looked for in all samples but were not detected. 

Bed 

no. 

P-197 

P-196 

P-195 

P-194 

P-193 

P-192 

P-191 

P-190 

P-189 

P-188 

-- P-187 

P-186 

P-185 

P-184 

P-183 

P-182 

P-181 

P-180 

P-179 

P-178 

Explanation of symbols 

Sample no. Al Ba Be B 

A = more than 10 percent 

B1= 1-10 percent! 

D = 0. 1-1 percent 

E = o. 01-0. 1 percent 

Cd Ca Cr Co Cu Fe 

Beds P-210 through P-198 not analyzed. 

RAG- 2-47 B' E G F E A D ND E D 

RAG- 1-47 B' E G F E A D ND E D 

VEM-265-47 B' F ND F F A D ND F D 

VEM-264-47 B' F ND ND F A D ND F D 

VEM-263-47 B' F ND F F A D ND F D 

VEM-262-47 B' E F E. F B' D ND E D 

VEM-259-47 B' E G F F A D ND E D 

VEM-258-47 B' E ND F F A D ND E D 

VEM-257-47 B' E ND F F A D ND E D 

VEM-256-47 B' E ND F E A D ND E D 

VEM-255-47 B' E G F E A D ND E D 

VEM-254-47 B' E G F E A D ND E D 

VEM-253-47 B' E G F E A D ND E D 

VEM-252-47 B' E ND F E A D ND E D 

VEM-251-47 B' E ND F E A D ND E D 

VEM-249-47 B' E G F ND A D ND E D 

VEM 248-47 B' E G F .F A D ND E D 

VEM-247-47 B' E G F E A D ND E D 

VEM-246-47 B' E G F E A D ND E D 

VEM-245-47 B' E G F E A D ND E D 

VEM-244-47 B' E G F ND B' D ND E D 

Beds P-177 through P-20 not analyzed. 

F = 0. 001-0.01 percent 

G = less than 0. 001 percent 

ND = not detected 

La Pb Mg Mn Mo Ni p 

E F D D F E A 

E F D D F E A 

E F D F F E A 

E E D E F E A 

E E D F F E A 

F E D E E E D 

F F D E F F A 

ND F B' E F F D 

F F D E F F A 

F F D E F F A 

F F D E F F A 

F F D E E E ·A 

F F D E F E A 

F F D E F E A 

F F D E F F A 

E F D F F E A 

E F D F F E A 

E F D E F E A 

E F D F F E B' 

F F D E F E A 

ND F D D F E' B' 

Si Ag Na Sr Sn Ti v y Zn 

B' G D D F E E E E 

B' G D D F E E E E 

B'. G D D F E E E F 

B' G D D F E E E F 

B' G D D F E E E F 

A F D D F D D E E 

B' G D D F E E F F 

B' G D D F E E ND F 

B' G D D F E E F F 

B' G D D F E E F F 

B' G D D F E E F E 

B' G D D ND D D F E 

B' G D D F E E F F 

B' G D D F E E F E 

B' G D D F E E F F 

B' G D D F D E E E 

B' G D D F E E E E 

B' G D D F E E E E 

B' G D D F D E E E 

A G D D F D E E E 

A G B' D F D E F E 

Zr 

E 

E 

E 

E 

E 

E 

E 

E 

E 

E 

E 

D 

E 

E 

E 

E 

E 

E 

E 

E 

D 

I 
w 

........ 

P- 19 

P- 18 

P- 17 

P- 16 

P- 15 

P- 14 

P- 13 

P- 1Z 

P- 11 

P- 10 

P- 9 

P- 8 

P- 7 

P- 6 

P- 5 

P- 4 

P- 3 

P- z 

P- 1 

VEM-180-47 B' 

VEM-179-47 B' 

VEM-178-47 B' 

VEM-177-47 B' 

VEM-176-47 B' 

VEM-175-47. B' 

RAH- 189-47 B' 

WOM- 318Z B' 

WOM- 3181 B' 

RAH- 186-47 B' 

RAH- 185-47 D 

RAH- 184-47 B' 

RAH- 183-47 B' 

RAH- 182-47 B' 

RAH- 181-47 B' 

RAH- 180-47 B' 

RAH- 179-47 B' 

RMC-133-47 B' 

RMC-134-47 B' 

E ND ND 

E G F 

E G F 

E ND F 

E ND F 

E ND E 

E ND F 

E ND F 

E ND F 

E ND F 

E ND F 

E ND F 

E ND F 

D G E 

E G E 

E G F 

D G F 

E ND F 

E ND F 

E A D ND E D F 

E A D ND E D F 

E A D ND E D F 

E A D ND E D E 

E A D ND E D E 

E A D ND E D E 

E A D ND E D E 

E A D ND E D E 

F A E ND E D E 

E A D ND E D E 

E A D ND E D F 

E A D ND E D F 

E A D ND E D F 

E B' D ND E D ND 

E B' D ND E D ND 

E B' E ND F D ND 

E B' D E E D F 

E A D ND F D E 

E A D ND F D E 

F D F F F A B' G D D F E E F F E 

E D F F E A B' G D D F E E F F E 

E D F F E A B' G D D F E E F F E 

E D F F E A B' F D D F E· E E E E 

E D E F E A B' F D D F D E E E D 

E D E F E A B' F D D F D E E E D 

E D E F E A B' F D D F D E E E D 

E D F ,F E A B' G D D F E E E E E 

F D E F E A B' G D D F D E E E E 

E D F F E A B' G D D F E E E E E 

E D F F E A B' G D D F E E E E E 

E D F F E A B' G D D F E E E E E 

E D F F E A B' G D D ND E E E E E 

F D E F E B' A G D D F D D F E E 

F D E F E D A G D D F D E F E E 

F B' D F E D A G D D F E E ND E E 

F D B' E B' B' A F D D E D D E E D 

E D E F E A B' G D D F E E E E E 

E D F F E A B' G D D F E E E E E 
t..:> 

M 

JOHNSON CREEK1 IDAHO. LOT NO. 1Z09. 

Phosphatic shale member of Phosphoria formation sampled in two bulldozer trenches on north side of Johnson Creek. SEt sec. 23. T. 8 s .. R. 43 E •• Caribou County~ Idaho. near north end of east limb of Aspen Range anticline. Beds strike N. 10-4o• W. and dip Z5-45° NE. Section measured by· 

R. M. Campbell~ R. A. Gulbrandsen. R. A. Hoppin. V. E. McKelvey~ and R. A. Weeks and sampled by Campbell and Weeks in September and October 1947. 

Samples analyzed for P 20 5 and acid insoluble by U.S. Bureau of Mines Laboratory. Albany. Oregon1 and for other constituents by Trace Elements Laboratory~ U. S. Geological Survey. Washington. D. C. 

Bed Rock description no. 

R- Z I Chert 

R- 1 Chert and mudstone 

P-119 Mudstone 

P-118 Phosphate rock. calc:rreous; fos. 

col. no. 47-HW-Z30 

P-117 Mudstone 

P-116 Mudstone 

P-115 Limestone. argillaceous 

P-114 Mudstone; fos. col. no. 47-HW-229 

P-113 Mudstone, calcareous; fos. col. no. 47-HW-228 

P-112 Mudstone; fos. col. no. 47-HW-227 

P-111 Phosphate rock 

P-110 Mudstone; fos. col. no. 47-HW-226 

P-109 Mudstone; fos. col. no. 47-HW-225 

P-108 Phosphate rock 

P-107 Phosphate rock 

P-106 Phosphate rock 

P-105 Phosphate rock 

P-104 Phosphate rock 

P-103 Phosphate rock and mudstone 

P-102 Phosphate rock 

l?-101 Phosphate rock / 

P-100 Phosphate rock 

P- 99 Phosphate rock, argillaceous 

P- 98 Mudstone 

P- 97 Mudstone, phosphatic 

P- 96 Phosphate rock 

P- 95 Phosphate rock 

P- 94 Phosphate rock 

Sample Thiclo;less Chemical analyses {percentl 

no. (feet) I J ~1 Loss on l Acid P205 Al203 Fe203 ignition insoluble 

Rex member of Phosphoria formation- basal beds only 

RAW- 73-47 

RAW- 7Z-47 

Phosphatic shale member of Phosphoria formation 

RAW- 71-47 0.6 2.9 -- -- --

RAW- 70-47 0.5 27.6 -- -- -- RAW- 69-47 1. 5 2.4 -- -- -- RAW- 68-47 1. 4 1. 5 -- -- -- RAW- 67-47 1.0 5. 7 -- -- -- RAW- 66-47 0.8 2. 1 -- -- --

RAW- 65-47 2.6 0.9 -- -- -- RAW- 64-47 2.4 3.2 -- -- -- RAW- 63-47 0.8 30.7 -- -- -- RAW- 62-47 2. 1 6.4 -- -- --

RAW- 57-47 0.5 1. 9 -- -- -- RAW- 56-47 0.6 36.9 0.63 0.46 1. 84 

RAW- 55-47 0.4 37.4 0.§3 0.41 1.32 

RAW- 54-47 0.4 35.3 2.0 0.87 3.88 

RAW- 53-47 0.8 36.5 0.82 0.50 1. 96 

RAW- 52-47 0.9 35.3 1.4 0.70 1. 68 

VEM-493-47 0.5 26.5 3.2 1. 28 2.98 

VEM-492-47 0.6 34.6 1.0 o:6o 0.80 

VEM-491-47 0.5 30.3 2.1 0.90 4.46 

VEM-490-47 0.5 33.0 1. 7 1.22 3.24 

VEM-489-47 0.6 19.7 7. 5 2.26 7. 22 

VEM-488-47 1.0 5. 5 ll. 3.20 11.12 

VEM-487-47 1.3 9. 5 9.4 1.88 10.78 

VEM-486-47 0.6 28.9 4. 1 1. 59 7.00 

VEM-485-47 0.6 31.8 }.3 0.30 5.40 

VEM-484-47 0.6 34.5 1.1 0.43 4.86 

91. 7 

7. 6 

84.0 

75.6 

23.2 

75.0 

65.2 

71.7 

13.3 

64.6 

79.4 

5. 6 

3. 6 

4.0 

4.5 

7. 3 

23.6 

9.9 

14.8 

11. 5 

35.1 

61.4 

55.3 

15. 5 

11. 7 

6.0 

Cumulative 

thickness 

(feet) 

8. 1 

11.6 

0.6 

1. 1 

Z.6 

4.0 

5. 0 

5. 8 

. 8. 4 

10.8 

11.6 

13. 7 

14.2 

14.8 

15.2 

15.6 

16.4 

17.3 

17.8 

18.4 

18.9 

19.4 

20.0 

21.0 

22.3 

Z2. 9 

23.5 

24.1 

Thickness x 

percent P 2o 

(cumulativef 

5.67 

9.87 

1.74 

15.54 

19.14 

21.24 

26.94 

28.62 

30.96 

. 38.64 

63.20 

76.64 

77.59 

99.73 

114.69 

128.81 

158.01 

189.78 

203.03 

223.79 

238.94 

255.44 

267.26 

272.76 

285.11 

302.45 

321.53 

342.23 
P- 93 Phosphate rock VEM-483-47 0.4 3Z.3 z.z 0.70 6.48 8. 7 

I 

Z4.5 

I 

355.15 

P- 9Z Phosphate rock VEM-48Z-47 0.8 3Z. 4 1. 6 1. 49 5.84 9.Z Z5. 3 381.07 

P- 91 Mudstone; fos. col. no. 47-HW-303 VEM-481-47 0.8 3. 0 4.Z 1. Z3 10.54 ·77. 1 Z6.1 383.47 

P- 90 Phosphate rock, argillaceous; fos. col. 

no. 47-HW-30Z VEM-480-47 0.6 19.9 5. z 1. 60 13.54 Z9. 1 

I 

Z6. 7 

I 

395.41 

P- 89 I Phosphate rock, argillaceous; fos. col. no. 47-HW-301 VEM-479-47 0.6 Z0.4 5.5 1. 53 15.76 Z4.8 Z7. 3 407.65 

P- 88 Phosphate rock VEM-478-47 1. 0 Z6.3 3.Z 1. zz 16.4Z 11. z Z8.3 433.95 

P- 87 Phosphate rock, argillaceous VEM-477-47 0.7 Z3.9 4.1 1. 48 16.74 zo. 1 Z9.0 450.68 

P- 86 Phosphate rock, argillaceous VEM-476-47 0.7 19.4 5. 5 1.91 11. 18 30.0 Z9.7 464.Z6 

P- 85 Phosphate rock, argillaceous VEM-475-47 0.6 19.Z 6.6 Z.l5 15.14 Z8. 5 30.3 475.78 

P- 84 Phosphate rock, argillaceous VEM-474'-47 0.8 zz. 6 4.7 1. 65 14.4Z Z0.9 31. 1 493.86 

P- 83 Phosphate rock, argillaceous VEM-473-47 1. z Z0.4 4.5 1. 59 14.64 Z7. Z 3Z.3 518.34 

P- 8Z Mudstone and phosphate rock VEM-47Z-47 1. 0 16.6 -- -- -- 33.0 33.3 534.94 

P- 81 Mudstone, phosphatic VEM-471-47 1.0 1Z.9 -- -- -- 45.9 34.3 547.84 

P- 80 Mudstone, phosphatic VEM-358-47 1. z 15.6 -- -- -- 4Z.O 35.5 566.56 

P- 79 Mudstone, calcareous; fos. col. no. 47-HW-300 VEM-357-47 1.5 z:1 -- -- -- 47.0 37.0 570.61 

P- 78 I Mudstone, phosphatic VEM-356-47 z.o 14.1 -- -- -- 46.6 39.0 598.81 

P- 77 Mudstone, phosphatic; fos. col. no. 

47-HW-Z99 VEM-355-47 0.8 15. 5 -- -- -- 46.4 39.8 611. Z1 

P- 76 Mudstone VEM-354-47 Z.9 7. 1 -- -- -- 67. z 4Z.7 631. 80 

P- 75 Mudstone, phosphatic VEM-353-47 1.7 10.7 -- -- -- 60.5 44.4 649.99 c., P- 74 Mudstone VEM-35Z-47 0.8 3.3 -- -- -- 78.1 45. z 6SZ.63 c., 

P- 73 Mudstone; fos. col. no. 47-HW-Z98 VEM-351-47 1.6 z. 4 -- -- -- 88.3 46.8 656.47 

P- 7Z Phosphate rock, argillaceous VEM-350-47 0.8 18.5 -- -- -- 45.9 47.6 671.Z7 

P- 71 Mudstone VEM-349-47 l.Z 1. 5 -- -- -- 85. 7 48.8 673.07 

P- 70 Mudstone, phosphatic VEM-348-47 1.3 8. z -- -- -- 69.5 so. 1 683.73 

P- 69 Mudstone, phosphatic and chert VEM-347-47 0.8 15. 3 -- -- -- 47.Z 50.9 695.97 

P- 68 Mudstone, phosphatic VEM-346-47 1. 7 8.0 -- -- -- 67. z 5Z. 6 709.57 

P- 67' Mudstone VEM-345-47 Z.4 4. 7 -- -- -- 77. z 55.0 7Z0.85 

P- 66 Mudstone, cherty RMC- 90-47 1. z 3. z -- -- -- 83.1 56. z 7Z4.69 

P- 65 Mudstone RAW- 51-47 1.1 1. 1 -- -- -- 86.8 57.3 7Z5.90 

P- 64 Mudstone and phosphate rock RAW- 50-47 z. 1 7. 6 -- -- -- 71. 1 59.4 741. 86 

P- 63 Mudstone anq phosphate rock RAW- Z7-47 1.5 lZ. 6 -- -- -- 54.1 60.9 760.76 

P- 6Z Mudstone RAW- Z6-47 0.9 7. 3 -- -- -- 71. 1 61.8 767.33 

P- 61 Mudstone RAW- ZS-47 0.6 7. 5 -- -- -- 63.3 6Z.4 771. 83 

P-· 60 Mudstone RAG- 15-47 4.8Z 4.3 -- -- -- 74.3 67.ZZ 79Z.56 

P- 59 Mudstone, phosphatic RAG- 14-47 0.75 16.6 -- -- -- 44.5 67.97 805.01 

P- 58 I Mudstone, phosphatic; fos. col. no. 

47-HW-Z97 RAG- 13-47 0.85 10.5 -- -- -- 60.7 68.8Z 813.93 

P- 571 M,udstone, phosphatic; fos. col. no. 47-HW-Z96 RAG- lZ-47 0.30 15.6 818.61 -- -- -- 50.7 69.1Z 

P- 56 Mudstone; fos. col. no. 47-HW-Z95 RAG- 11-47· 1. 9Z 6. 8 -- -- -- 69.7 71.04 831.67 

1 Fossil collection made by H. Wedow, ~aleontology and Stratigraphy Br~ch, U.S. Geological Survey. 
w 

..r:::. 

Bed 

no. 

P- 55 

P- 54 

P- 53 

P- 52 

P- 51 

P- 50 

P- 49 

P- 48 

P- 47 

P- 46 

P- 45 

P- 44 

P- 43 

.P- 42 

P- 41 

P- 40 

P- 39 

P- 38 

P- 37 

P- 36 

P- 35 

P- 34 

P- 33 

P- 32 

P- 31 

P- 30 

P- 29 

P- 28 

P- 27 

P- 26 

P- 25 

P- 24 

P- 23 

P- 22 

P- 21 

P- 20 

p-· 19 

Rock description 

Mudstone, phosphatic; fos. col. no. 

47-HW-294 

Mudstone 

Mudstone, phosphatic, contains chert 

nodules 

Mudstone 

Phosphate rock, argillaceous 

Mudstone 

Mudstone 

Mudstone 

Phosphate rock 

Mudstone 

Mudstone 

Mudstone; fos. col. no. 47-HW-293 

Mudstone; fos. col. no. 47-HW-292 

Mudstone, phosphatic 

Mudstone 

Mudstone, phosphatic; fos. col. no. 

47-HW-291 

Phosphate rock, argillaceous; fos. 

col. no. 47-HW-291 

Mudstone 

Mudstone, phosphatic 

Mudstone 

Mudstone; fos. col. no. 47-HW-290 

Phosphate rock and phosphatic mudstone 

Mudstone, phosphatic; fos. col. no. 

47-HW-289 

Phosphate rock 

Mudstone 

Mudstone, phosphatic 

Mudstone " 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone 

Mudstone; fos. col. no. 47.-HW-306 

Mudstone 

Mudstone; fos. col. no. 47-HW-305 

Mudstone 

Mudstone 

Sample Thickness 

no. (feet) Pz05 

RAG- 10-47 1. 02. 14.8 

RAG- 9-47 2.62 5. 5 

RAG- 8-47 0.62 11.8 

RAG- 7-47 3.3 1. 3 

RAH- 216-47 0.4 23.0 

RAH- 215-47 1. 9 1. 8 

RAH- 214-47 1.3 0.6 

RAH- 199-47 0.9 o. 7 

RAH- 198-47 0.3 30.0 

RAH- 197-47 1. 0 3. 3 

RAH- 196-47 3.0 2.4 

RAH- 195-47 0.5 3. 2 

RAH- 194-47 1.9 o. 8 

RAH- 193-47 0.9 9.8 

RAH- 192-47 1. 4 1. 6 

RAH- 191-47 0.7 14. 7 

RAH- 190-47 0.6 19.7 

RAG- 24-47 2.-64 4.4 

RAG- 23-47 1. 48 11.9 

RAG- 2.2-47 1. 91 7. 0 

RAG- 21-47 3.0 1.1 

RAG- 20-47 0.95 22.7 

RAG- 19-47 1.16 8.0 

RAG- 18-47 0.45 32.0 

RAG- 17-47 1. 71 4.3 

VEM-507-47 1.9 11.6 

VEM-506-47 0.6 3.0 

VEM-505-47 1.4 13. 6 

VEM-504-47 1.6 12.4 

VEM-503-47 0.6 9.4 

VEM-502-47 0.8 9. 0 

VEM-501-47 1. 6 5. 0 

VEM-500-47 2.8 2. 5 

VEM-499-47 0.8 4.7 

VEM-498-47 1. 1 3.9 

VEM-497-47 0.9 7. 4 

VEM-496-47 1. 5 1. 2 

Chemical analyses (percent) Cumulative Thickness x 

Al20 3 Fe2o3 

Loss on Acid thickness percent P 20 

ignition insoluble (feet) (cumulativef 

-- -- -- 46.5 72.06 846. 76 

-- -- -- 70.8 74.68 861.17 

-- -- -- 58.9 75.30 868.49 

-- -- -- 86.8 78.60 872. 78 

-- -- -- 32.0 79.00 881. 98 

-- -- -- 84.2 80.90 885.40 

-- -- -- 87.3 82.20 886.18 

-- -- -- 88.5 83. 10 886. 81 

-- ...... -- 18.9 83.40 895. 81 

-- -- -- 77.9 84.40 899. 11 

-- -- -- 84.1 87.40 906.31 

-- -- -- 80.8 87.90 907. 91 

-- -- -- 85.6 89.80 909.43 

-- -- -- 62.0 90.70 918.25 

-- -- -- 84.6 92.10 920.49 

-- -- -- 46.5 92.80 930. 78 

-- -- -- 39.0 93.40 942.60 

-- -- -- 79.9 96.04 954.22 

-- -- -- 61.9 97.52 971. 83 

-- -- -- 73.2 99.43 985.20 

-- -- -- 88. 1 102.43 988.50 

-- -- -- 31.0 103.38 1, 010. 06 

-- -- -- 70.8 104.54 1, 019. 34 

-- -- -- 8.2 104.99 1, 033. 74 

-- -- -- 78.2 106.70 1, 041. 10 

-- -- -- 52.3 108.60 1, 063. 14 

-- -- -- 78.6 109.20 1, 064. 94 

-- -- -- 43.9 110. 60 1.083.98 

-- -- -- 48.8 112. 20 1, lg3. 82 

-- -- -- 57.4 112.80 1,1,.9.46 

''· -- -- -- 58.2 113.60 1, 116. 66 

-- -- -- 72.0 115. 20 1, 124. 66 

-- -- -- 79.4 118. 00 1, 131. 66 

-- -- -- 72.6 118.,80 1, 135. 42 

-- -- -- 77.1 119.90 1, 139. 71 

. \ 

-- -- -- 65.0 120.80 1, 146. 3( 

-- -- -- 86.0 122.30 1, 148. 17 
w 

c:J1 

P- 18 

P- 17 

P- 16 

P- 15 

P- 14 

P- 13 

P- 12 

p.;. 11 

P- 10 

P- 9 

P- 8 

P- 7 

P- 6 

P- 5 

P- 4 

P- 3 

P- 2 

P-, 1 

Cw- 1 

Cw- 2 

Cw- 3 

Mudstone, phosphatic VEM-495-47 1.6 11.3 

Mudstone, phosphatic VEM-494-47 1. 1 8.8 

Mudstone RMC-111-47 1.0 6.4 

Mudstone, phosphatic RMC-110-47 1.4 12.4 

Mudstone, phosphatic RMC-109-47 1.4 14.8 

Mudstone RMC-108-47 0.9 3.0 

Mudstone, phosphatic RMC-107-47 1.7 14.3 

Phosphate rock, argillaceous RMC-106-47 1.5 16.8 

Mudstone and phosphate rock RMC-105-47 1.3 14.8 

Mudstone, phosphatic VEM-517-47 0.7 15. 5 

Phosphate rock, argillaceous VEM-516-47 2.0 21. 2 

Phosphate rock VEM-515-47 1.6 28. 5 

Mudstone, phosphatic VEM-514-47 1.9 13. 2 

Mudstone, phosphatic VEM-513-47 1.0 11.5 

Mudstone VEM-512-47 1.2 5. 6 

Mudstone VEM-511-47 1. 8 1.4 

Mudstone, phosphatic VEM-510-47 0.4 9.5 

Phosphate rock VEM-509-47 0.25 35.7 

The lower phosphate bed appears to be absent due to faulting. 

Wells formation 

Dolomite; fos. col. no. 47-HW-304 VEM-508-47 3.2 1.1 

Clay and phosphate rock -- o. 1 -- Dolomite -- 0.2 --

-

-- -- -- 55.7 123.90 1, 166. 25 

-- -- -- 61.9 125.00 1, 175.93 

-- -- -- 71.8 126.00 1, 182. 33 

-- -- -- 52.8 127.40 1, 199. 69 

-- -- -- 46.6 128.80 1, 220. 41 

-- -- -- 82.9 129.70 1, 223. 11 

-- -- -- 48.3 131.40 1, 247.42 

-- -- -- 40.0 132.90 1, 272. 62 

-- -- -- 47.6 134.20 1, 291.86 

-- -- -- 45.3 134.90 1, 302. 71 

-- -- -- 27.5 136.90 1, 345. 11 

-- -- -- 15.8 138.50 1, 390. 71 

-- -- -- 50.2 140.40 1,415. 79 

-- -- -- 55.0 141.40 I, 427.29 

-- -- -- 68.8 142.60 1, 434. 01 

-- -- -- 75.0 144.40 1,436.53 

-- -- -- 56.5 144.80 1, 440. 33 

-- -- -- 4.8 145. 05 1, 449. 26 

-- -- -- 7. 3 3.2 3.52 

-- -- -- -- 3.3 -- -- -- -- -- 3.5 --
w 

~ 

SPECTROORAPHIC ANALYSES-JOHNSON CREEK. IDAHO. LOT NO. 1Z09. 

Semi-quantitative analyses of selected samples of the phosphatic shale member of the Phosphoria formation, Johnson Creek, Idaho 

(see immediately preceding pages for location of section, thickness and description of strata. and chemical analyses of samples), made by 

the U. S. Geological Survey Laboratory,, Geochemistry and Petrology Branch. Washington, D. C. In addition to the elements listed in the 

table below. Sb, As. Be. Bi, Cs, Co, Cb, Dy, Sm, Sc, Ta, Te, Tb, Tl. Tm, W, and Yb were looked for in all samples but were not 

detected. 

Explanation of symbols 

A= more than 10 percent F = 0. 001-0·. 01 percent 

B1= 1-10 percentl G =less than 0. 001 percent 

D = o. 1-1 percent ND = not detected 

E = 0. 01-0. 1 percent 

Bed Sample no. Al Ba B Cd Ca Cr Cu Fe Ga La Pb Mg M;n Mo Ni p Si Ag Na Sr Sn Ti v y Zn Zr no. 

Beds P-119 through P-109 not analyzed. 

P-108 RAW- 56-47 D F ND F A D F D ND E ND E F ND E B' B' G D E ND E D E E F 

P-107 RAW- 55-47 D F ND F A D F D ND E ND E F ND E B' B' G D E ND F D E E F 

P-106 RAW- 54-47 D F ND ·F A D ND D ND E E D F ND E B' B' G D E F E D E E F 

P-105 RAW- 53-47 D F ND F .A D E D ND E ND E F ND E B' B' G D E F E D E E F 

P-104 RAW- 5Z-47 D F ND ND A D F D ND E E E F ND E B' B' G D E ND E D E E F 

P-103 VEM-493-47 B' F F F B' D F D ND F ND E E ND F B' A G D D ND E E F E F 

P-lOZ VEM-49Z-47 D G F F B' D F D ND F ND E E ND ND B' A G D D ND E E F F F 

P-101 VEM-491-47 D G F F B' D F D ND F ND E E ND ND B' A G D D ND E D F F F 

P-100 VEM-490-47 D G F F B' D F D ND. E NI;> E F ND F B' A G D D ND E D E F F 

P- 99 VEM-489-47 B' E F F B' D F D F F F E E ND F B' A G D D ND E D F E E 

P- 98 VEM-488-47 B' E F F B' D F B' F F· F E ·E ND E D A G D E ND E D F E E 

P- 97 VEM-487-47 B' E F F Bi D F D F F F E E ND F D A G D E ND E D F E F 

P- 96 VEM-486-47 B' F F E B' D F D ND F ND E E ND F B' A G D D ND E E F E F 

P- 95 VEM-485-47 D F F E B' D F D ND F ND E F ND F B' A G D D ND E D F E F 

P- 94 VEM-484-47 D G F E B' D F D ND F ND E F ND F B' A G D D ND E D F E F 

P- 93 VEM-483-47 D F F E B' D F D ND F ND E F ND E B' A G D D ND E D F E F 

P- 9Z VEM-48Z-47 D G F E B' D F D ND F ND E F ND F B' A G D D ND E D F E F 

P- 91 VEM-481-47 :a• F F E A D E D ND E E D F ND E B' B' F D E ND E D E E F 

P- 90 VEM-480-47 B' F F E A D E D ND E E D F ·F E B' B' F D E ND E D E E F 

P- 89 VEM-479-47 B' F F E A D E D ND E E D F F E B' B' F D E ND E D E E F 

P- 88 VEM-478-47 B' F F E A D E D ND F E D F ND E B' . B' F D E F E D E E F 

P- 87 VEM-477-47 B' F F E A D E D ND F E· D F ND . E. B' B' F D E ND E D E :E F 

P- 86 VEM-476-47 B' E F E A D E D ND E E D F F E B' B' F D E ND E D E E F 

P- 85 VEM-475-47 B' E F E A D E D ND E E D F F ND B' B' F D E ND E D E E F 

--- ----- --~~ ···- --------·--

! 
P- 84 VEM-474-47 I B'l F I F I E I A I D 

E D ND E ND D F F E B' B' F D E ND E D E E F 

P- 83 VEM-473-47 B' F F E A D E D ND E E D F F E B' B' F D E ND E D E E F 

Beds P-8Z through P-1 not analyzed. 

1 B' is equivalent to B and C of Bureau of Mines analyses as recorded in other reports. 
w 

CD 

SOUTH DRY VALLEY, IDAHO. LOT NO. 1211. 

Phosphatic shale member of Phosphoria formation sampled in two bulldozer trenches near south end of Dry Valley, NWtsEi sec. 14, T. 9 S .• 

R. 44 E •• Caribou County, Idaho, on west limb of Schmid syncline. Beds strike N. 55° W. and dip 45° NE. Section measured by R. M. Campbell, 

R. A. Gulbrandsen, V. E. McKelvey, H. Wedow, and R. A. Weeks and sampled by CaxPpbell and Weeks in September and October 1947. Samples 

analyzed for P 2o5• F, and acid insoluble by U.S. Bureau of Mines Laboratory, Albany, Oregon, and for other constituents by Trace Elements 

Section Laboratory, U.S. Geological Survey, Washington, D. C. 

Bed Sample Thickness Ch mical analyses (percent) Cumulative Thickness x 

no. Rock description no. (feet) P20s Al2o3 Fe2o3 F Loss on AC1C1 thickness percent P 2 0 

ignition insoluble (feet) ( cumulahve r 

Hex member of Phosphoria form~~·ml.-basal beds only 

R- 4 Chert 12.0 -- ,. -- -- -- -- -- 12.0 -- R- 3 Chert 1020-HW 4.4 0.3 -- -- -- -- 87.9 16.4 1. 32 

R- 2 Mudstone 1019-HW 0.3 o.s -- -- -- -- 71.4 16.7 1.47 

R- 1 Chert 1018-HW 4.4 0.5 -- -- -- -- 86.3 21. 1 3.67 -- - --- --- ----- ----

Phosphatic shale member of Phosphoria formation 

P-182 Phosphate rock, argillaceous; 

fos. col. no. 47-HW-2881 1017-HW 0.5 23.8 -- -- -- -- 32.3 o. 5 11.90 

P-181 Phosphate rock, argillaceous; 

fos. col. no. 47-HW-287 1016-HW 0.4 25.2 -- -- 2. 2 -- 29.3 0.9 21.98 

P-180 Mudstone, phosphatic 1015-HW 0.4 8.6 -- -- -- -- 57.3 1.3 25. 42. 

P-179 Mudstone 1014-HW 0.9 2. 5 -- -- -- -- 76.9 2. 2 27.67 

P-178 Mudstone; fos. col. no. 47-HW-286 1013-HW 1.4 5. 2 -- -- -- -- 65.3 3. 6 34.95 

P-177 Mudstone 1012-HW 1.5 1. 9 -- -- -- -- 75.4 5. 1 37.80 

P-176 Mudstone 1011-HW 0.4 2. 9 -- -- -- -- 72.0 5. 5 38.96 

P-175 Mudstone 1010-HW 1. 1 0.9 -- -- -- -- 79.9 6. 6 39.95 

P-174 Mudstone 1009-HW 2.7 0.7 -- -- -- -- 79.9 9.3 41.84 

P-173 Mudstone; fos. col. no. 47-HW-285 1008-HW 1.2 1.3 -- -- -- -- 78.8 10.5 43.40 

P-172 Mudstone; fos. col. no. 47-HW-284 1007-HW 0.8 4.5 -- -- -- -- 67.8 11.3 47.00 

P-171 Mudstone; fos. col. no. 47-HW-283 1006-HW 1.4 4.8 -- -- -- -- 73.5 12. 7 53.72 

P-170 Mudstone; fos. col. no. 47-HW-282 1005-HW 0.5 5.6 -- -- -- -- 74.1 13.2 56.52 

P-169 Mudstone 1004-HW 1.7 0.9 -- -- -- -- 84.7 14.9 58.05 

P-168 Mudstone 1003-HW 1.3 6.8 -- -- -- -- 66.2 16.2 66.89 

P-167 Phosphate rock 1002-HW 0.8 30.9 -- -- -- -- 16.0 17.0 91.61 

P-166 Mudstone 1001-HW 1.8 3. 5 -- -- -- -- 72.4 18.8 97.91 

P-165 Mudstone; fos. col. no. 47-HW-281 RAG- 123-47 1. 45 o. 6 -- -- -- -- 80.8 20.25 98.78 

P-164 Mudstone RAG- 122-47 0.69 1.4 -- -- -- -- 76. 7 20.94 99.75 

P-163 Phosphate rock RAG-121-47 0.52 34.9 0.87 0.39 3.37 2.04 7. 9 21.46 117.89 

P-162 Phosphate rock RAG-120-47 0.25 34.0 2.2 0.93 -- 4.34 5. 9 21. 71 126.39 

P-161 Phosphate rock RAG-119-47 0.42 35.9 1. 4 o. 51 -- 3.14 5. 0 22.13 141.4 7 

P-160 Phosphate rock RAG-118-47 o.s 33.8 2.2 0.85 -- 4.90 6. 1 222.63 158. 37 

P-159 Phosphate rock and phosphatic 

mudstone RAG- 117-47 1.0 33.2 1. 4 0.70 -- 2.58 11.0 23.63 191.57 
P-158 Mudstone, phosphatic RAG- 116-47 0.98 9.0 11. 3.29 -- 3.34 I 61.8 I 24.61 I 200.39 

P-157 Mudstone and argillaceous 

phosphate rock RAG- 115-47 0.74 24.8 5.7 2.15 2.53 3~46 27.4 25.35 218.74 

P-156 Phosphate rock RAG- 114-47 0.6 32.5 2.2 1. 10 -- 2.84 12.9 25.95 238.24 

P-155 Mudstone, phosphatic and 

phosphate rock RAG- 113-47 1. 13 20.3 6.7 2.16 -- 4.44 36. 1 27.08 261. 18 

P-1541 Phosphate rock RAG- 112-47 0.8 32.0 2.3 1. 05 -- 2.90 13. 1 27.88 286.78 

P-153 Mudstone, phosphatic and ' I phosphate rock RAG- 111-47 0.79 12.6 9.2 2.76 -- 4.82 54.0 I 28.67 296.74 

P-152 I Phosphate rock. RAW-104-47 0.8 34.4 1. 8 0.74 -- 3.20 7. 2 29.47 324.26 

Phosphate rock RAG-110-47 (0. 82) 35.3 -- -- -- -- 6.0 

P-151 I Phosphate rock and phosphatic 

mudstone RMC- 96-47 0.5 26.4 4.5 1. 48 -- 5. 56 22.6 I 29.97 I 337.46 

Phosphate rock RAG- 109-47 (o. 45) 32.0 -- -- -- -- 14.4 

RAG-109-47 and RAG-110-47 are logged as equivalent to RMC-96-47 and RAW-104-47. 

P-150 I Phosphate rock and argillaceous 

phosphate rock RMC- 95-47 o. 7 30.9 2.7 0.98 -- 4.16 14.6 30.67 I 359.09 

P-1491 Phosphate rock RMC- 94-47 o.s 30.4 2.6 1. 02 -- 4.06 15.7 31. 17 374.29 

P-148 Mudstone, phosphatic; fos. col. 

no. 47-HW-280 RMC- 93-47 o.s ll. 8 8.3 2. 71 -- 6.32 57. 1 31.67 

I 

380.19 

P-147 Mudstone RMC- 92-47 0.5 5. 2 11. 3.33 -- 4. 64 73.5 32.17 382.79 

P-146 Mudstone, phosphatic RMC- 91-47 0.7 10. 5 9.2 2.60 -- 5.02 47. 1 32.87 390.14 

~ P-145 Phosphate rock and phosphatic 

mudstone VEM-608-47 0.7 27.6 3.7 1. 27 -- 5. 52 20.0 33.57 I 409.46 

P-144 Phosphate rock and phosphatic 

mudstone VEM-607-47 1. 7 18.8 6.6 2.31 -- 5.80 38.9 35.27 441. 42 

P-1431 Mudstone VEM-606-47 0.8 6.8 11. 3.90 -- 8.74 63.3 36.07 446.86 

P-142 Phosphate rock and phosphatic 

mudstone VEM-605-47 0.6 27. 1 3. 8 1. 32 -- 5.92 20.5 36.67 463.·12 

P-141 I Phosphate rock VEM-604-47 0.6 33.9 1. 4 0.58 -- 5. 14 8.o 37.27 483.46 

P-140 Phosphate rock VEM-603-47 0.8 31. 1 2.2 0.88 -- 12.48 11.2 38.07 508.34 

P-139 Phosphate rock VEM-602-47 1. 1 30.8 2.6 1. 06 -- 6.06 12.0 39.77 560.70 

P-138 Phosphate rock RMC-132-47 0.5 31.6 2.3 0.84 -- 5. 72 11.5 40.27 576.50 

P-137 Phosphate rock, argillaceous RMC-131-47 0.7 23.4 5. 3 2.28 _.., 9.34 24.7 40.97 592.88 

P-136 Phosphate rock, argillaceous., 

calcareous RMC-130-47 o.s 15.6 7.8 2.61 -- 15.90 35.4 41.47 600.68 

P-135 Phosphate rock, argillaceous, 

calcareous RMC-129-47 1.0 18.4 6. 1 2. 14 -- 14.28 30.9 42.47 619.08 

P-134 Phosphate rock and argillaceous 

phosphate rock RMC-128-47 0.8 22.2 5.0 1.89 -- 12.86 24.5 43.27 636.84 

P-1331 Phosphate rock RMC-127-47 0.8 25.8 3.4 1.48 -- 13.88 16.1 44.07 657.48 

P-132 Phosphate rock RMC-126-47 1. 1 27.6 2.7 1.3 -- 9.48 14.6 45. 17 687.84 

P-131 Mudstone, phosphatic; fos. col. 

no. 47-HW-279 RMC-125-47 0.7 23.5 5. 2 2.57 -- 9.78 25.2 45.87 I 704.29 

1 Fossil collection made by H. Wedow, Paleontology and Stratigraphy Branch, U. S. Geological Survey. 
Bed Sample Thickness Chemical analyses (percent Cumulative Thickness x 

no. Rock description no. {feet) P2o5 Al2o3 Fe2o3 F Loss on Acid thickness percent P20 

ignition insoluble {feet) (cumulativef 

P-130 Phosphate rock, argillaceous RMC-124-47 1.0 18.6 7. 1 2.48 -- 8.86 36.0 46.87 722.89 

P-129 Phosphate rock, argillaceous RMC-123-47 0.4 20.0 6.6 2.53 -- 9.28 32.9 47.27 730.89 

P-128 Phosphate rock, argillaceous RMC-122-47 1. 2 22.5 5.0 1. 99 -- 11.56 27.0 48.47 757.89 

P-127 Phosphate rock, argillaceous; 

fos. col. no. 47-HW-278 RMC-121-47 1. 4 20.7 5.4 1.98 -- 10.70 29.6 49.87 786.86 

P-126 Phosphate rock and phosphatic 

calcareous mudstone RMC-120-47 1.5 16.8 -- -- -- -- 35.8 51.37 812.06 

P-125 Mudstone, phosphatic; fos. col. no. 47-HW-277 RMC-119-47 0.6 14.6 -- -- -- -- 43.7 51.97 820.82 

P-124 Mudstone, phosphatic; fos. col. 

no. 47-HW-277 RMC-118-47 1. 2 10.8 -- -- -- -- 51.6 53.17 833.78 

P-123 Mudstone, phosphatic RMC-117-47 1. 1 12. 5 -- -- -- -- 50.9 54.27 847.53 

P-122 Mudstone; fos. col. no. 47-HW-276 RMC-116-47 0.9 7. 3 -- -- -- -- 67.8 55.17 854. 10 

P-121 Mudstone RMC-115-47 1.5 3. 9 _ .. -- -- -- 76. 1 56.67 859.95 

P-120 Mudstone, phosphati.c RMC-114-47 0.9 12.6 -- -- -- -- 50.7 57.57 871.29 

P-119 Mudstone, phosphatic RMC-113-47 1. 1 10.6 -- -- -- -- 54.7 58.67 882.95 

P-118 Mudstone, phosphatic; fos. col. no. 47-HW-275 RMC-ll2-47 1. o\ 12.3 -- -- -- -- 52.2 59.67 895.25 

P-117 Phosphate rock, argillaceous VEM-Z92-47 0.4 22.7 -- -- -- -- 34.1 60.07 904.33 

P-116 Mudstone; fos. col. no. 47-HW-274 VEM-291-47 0.7 6.8 -- -- -- -- 68.1 60.77 9.09. 09 

P-115 Mudstone VEM-290-47 1. 4 7.0 -- -- -- -- 68.5 62.17 918.89 

P-114 Mudstone VEM-289-47 1. 1 7. 8 -- -- -- -- 67.6 63.27 927.47 

P-113 Mudstone; fos. col. no. 47-HW-273 RAW-103-47 1.3 7. 8 -- -- -- -- 66.9 64.57 937.61 

P-112 Phosphate roc.k and mudstone RAW-102-47. 0.5 9.0 -- -- -- -- 63.0 65.07 942. 11 

P-111 Mudstone, phosphatic RAW-101-47 0.6 16.8 -- -- -- -- 46.3 65.67 952. 19 

P-110 Mudstone; fos. col. no. 47-HW-272 RAW-100-47 1. 2 6. 3 -- -- -- -- 74.7 66.87 959.75 

P-109 Mudstone, phosphatic RAW- 99·-47 0.6 13.9 -- -- -- -- 56.0 67.47 968.09 

P-108 Mudstone, phosphatic; fos. col. 

no. 47-HW-271 RAW- 98-47 0.9 12.4 -- -- -- -- 60.2 68.37 979.25 

P-107 Mudstone; fos. col. no. 47-HW-270 RAW- 97-47 1. 1 2. 1 -- -- -- -- 85.1 67.47 981. 56 

P-106 Mudstone RAW- 96-47 0.9 4.4 -- -- -- -- 79.3 70.37 985.52 

P-105 Mudstone, phosphatic RAW- 95-47 0.6 11.7 -- -- -- -- 60.0 70.97 992.54 

P-104 Mudstone, phosphatic RAW- 94-47 0.9 12. 1 -- -- -- -- 51.6 71.87 1, 003.43 

P-103 Mudstone, phosphatic and chert RAW- 93-47 o.8 8. 3 -- -- -- -- 68.9 72.67 1, 010. 07 

P-102 Mudstone, phosphatic RAW- 92-47 0.9 8.o -- -- -- -- 68.4 73.57 1,017.27 

P-101 Mudstone RAW- 91-47 1. 5 6. 1 -- -- -- -- 74.6 75.07 1,026.42 

P-100 Mudstone RAW- 90-47 o.8 5. 5 -- -- -- -- 76.0 75.87 ·1, 030. 82 

P- 99 Mudstone RAW- 89-47 0.7 3.9 -· -- -- -- 81.0 76.57 1, 033. 55 

P- 98 Mudstone RAW- 88.;,.47 1. 2 2.2 -- -- -- -- 78. 1 77.77 1,036.19 

P- 97 Mudstone VEM-601-47 1. 4 4.7 -- I 

.... -- -- 76.3 79.17 1, 042. 77 

P- 96 Mudstone and argillaceous 

phosphate rock VEM-600-47 0.9 9.5 -- -- -- -- 63.0 80.07 1,051.32 
P- 95 Phosphate rock, argillaceous VEM-599-47 0.5 zz. 3 -- -- -- -- 34.9 80.57 1, 062.47 

P- 94 Mudstone, phosphatic VEM-598-47 0.8 9.6 -- -- -- -- 62. 1 81.37 1, 070. 15 

P- 93 Mudstone, phosphatic VEM-597-47 0.7 8.0 -- -- -- -- 64.3 82.07 1, 075. 75 

P- 92 :Mudstone VEM-596-47 0.6 5. 8 -- -- -- -- 65.8 82.67 1, 079. 23 

P- 91 Mudstone VEM-595-47 0.4 3. 3 -- -- -- -- 68.0 83.07 1, 080. 55 

P- 90 Phosphate rock, mudstone, and 

phosphatic mudstone VEM-594-47 0.9 8.3 -- -- -- -- 63.7 83.97 1, 088. oz 

P- 891 Mudstone, phosphatic VEM-593-47 o. 8 . 8.4 -- -- -- -- 66.8 84.77 1, 094. 74 

P- 88 Mudstone VEM-592-47 z.s 5. 1 -- -- -- -- 74.6 87.57 1, 109. oz 

P- 87 Phosphate rock, mudstone, and 

phosphatic mudstone VEM-591-47 0.9 15.0 -- -- -- -- 47.7 88.47 1, lZZ. 52 

P- 86 I Mudstone; fos. col. no. 47-HW-269 VEM-590-47 1.4 3. 5 -- -- -- -- 79.8 89.87 1, 127.42 

P- 85 I Mudstone, phosphatic VEM-589-47 1. 4 9. 1 -- -- -- -- 61. z 91.27 1, 140. 16 

P- 84 Mudstone and argillaceous 

phosphate rock VEM-.588-47 1.4 7. z -- -- -- -- 67.3 92.67 1, 150. 24 

P- 83 I Phosphate rock and phosphatic 

mudstone VEM-587-47 0.6 14.6 .-- -- -- -- 48.4 93.27 1, 159. 00 

P- 82 I Mudstone, phosphatic VEM-586-47 0.5 8.5 -- -- -- -- 48.3 93.77 1, 163. 25 

P- 81 Mudstone, phosphatic and 

mudstone; fos. col. no. 47-HW-268 VEM-585-47 2.3 7. 0 -- -- -- -- 66.7 96.07 1, 179. 35 

P- 80 Phosphate rock, argillaceous, 

~ and phosphatic mudstone VEM-584-47 0.8 13.6 -- -- -- -- 57.2 96.87 1, 190. 23 ....... P- 79 Mudstone; fos. col. no. 47-HW-267 VEM-583-47 2.7 0.9 -- -- -- -- 87.5 99.57 1, 192. 66 

P- 78 Mudstone and phosphate rock VEM-582-47 0.9 13.9 -- -- -- -- 56.3 100.47 1, 205. 17 

P- 77 Mudstone VEM-581-47 1.3 4.9 -- -- -- -- 78.8 101.77 1, Zll. 54 

P- 76 Mudstone VEM-580-47 z. 1 0.7 -- -- -- -- 86.9 103.87 1,213.01 

P- 75 Mudstone VEM-579-47 1. 1 1. 4 -- -- -- -- 87.0 104.97 1, 214. 55 

P- 74 Phosphate rock, argillaceous VEM-578-47 0.3 23.6 -- -- -- -- 31. 1 105.27 1, ZZl. 63 

P- 73 Mudstone VEM-577-47 2.3 7. z -- -- -- -- 71.7 107.57 1, 238. 19 

P- 72 Mudstone and phosphate rock VEM-576-47 1.2 8.4 -- -- -- -- 67.9 108.77 1, 248. 27 

P- 71 Mudstone VEM-575-47 1.0 1. z -- -- -- -- 87.6 109.77 1, 249.47 

P- 70 Phosphate rock VEM-574-47 1.6 31.4 -- -- -- -- 12. 7 111. 37 1, 299. 71 

P- 69 Mudstone VEM-573-47 1. z 5. z -- -- -- -- 76.5 112. 57 1,305.95 

P- 68 Phosphate rock, argillaceous VEM-572-47 1. 4 21.3 -- -- -- -- 38.3 113.97 1, 335. 77 

P- 67 Mudstone VEM-571-47 1. 0 6. 5 -- -- -- -- 73.9 114.97 1, 342. 27 

P- 66 Phosphate rock and mudstone VEM-570-47 1. 4 7. 6 -- -- -- -- 65.3 116. 37 1, 352. 91 

P- 65 Mudstone VEM-569-57 0.9 7. 5 -- -- -- -- 65.3 117. 27 1, 359. 66 

P- 64 Mudstone, phosphatic VEM-568-47 0.8 9. 1 -- -- -- -- 61.9 118.07 1, 366.94 

P- 63 Phosphate rock, argillaceous VEM-567-47 2.0 20.0 -- -- -- -- 28.6 120.07 1, 406. 94 

P- 62 Mudstone, phosphatic VEM-566-47 1.5 9.9 -- -- -- -- 55.8 121. 57 1, 421. 79 

P- 61 Mudstone VEM-565-47 0.8 3. 7 -- -- -- -- 73.8 122. 3 7 1, 424. 75 

P- 60 Phosphate rock, argillaceous VEM-564-47 0.9 15. 1 -- -- -- -- 37.8 123.27 1,438.34 

P- 59 Mudstone, phosphatic VEM-563-47 1. 2 14.4 -- -- -- -- 46.3 124.47 1, 455. 62 

P- 58 Phosphate rock, argillaceous VEM-562-47 1. 1 16.8 -- -- -- -- 37.9 125.57 1,474.10 
1+:>-

M 

Bed 

no. 

P- 57 

P- 56 

P- 55 

P- 54 

P- 53 

P- 52 

P- 51 

P- 50 

P- 49 

P- 48 

P- 47 

P- 46 

P- 45 

P- 44 

P- 43 

P- 42 

P- 4I 

P- 40 

P- 39 

P- 38 

P- 37 

P- 36 

P- 35 

P- 34 

P- 33 

P- 32 

P- 31 

P- 30 

P- 29 

P- 28 

P- 27 

P- 26 

P- 25 

P- 24 

P- 23 

P- 22 

P-. 2I 

Rock description 

Mudstone 

Mudstone, phosphatic 

Mudstone 

Mudstone and chert; fos. col. 

no. 47-HW-266 

Mudstone; fos. col. no. 47-HW-265 

Mudstone 

Mudstone, phosphatic 

Mudstone; fos. col. no. 47-HW-264 

Mudstone 

Mudstone, phosphatic 

Mudstone; fos. col. no. 47-HW-263 

Mudstone 

Mudstone, phosphatic; fos. 

col. no. 47-HW-262 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone, phosphatic 

Phosphate rock, argillaceous 

Phosphate rock, argillaceous 

Phosphate rock and mudstone 

Phosphate rock 

Phosphate rock and mudstone 

Phosphate rock a.nd mudstone 

Mudstone, phosphatic 

Mudstone, phosphatic; fos. col. no. 47-HW-261 

Mudstone, phosphatic 

Mudstone, phosphatic__ 

Mudstone, phosphatic 

Mudstone, phosphatic; fos. col. no. 47-HW-260 

Limestone, argillaceous 

Mudstone, calcareous 

Phosphate rock, argillaceous 

Phosphate rock, argillaceous 

Phosphate rock, argillaceous 

Mudstone, phosphatic 

Sample Thickness 

no. (feet) P2o5 

VEM-56I-47 1.5 2. 8 

VEM-560-47 1.2 8. 5 

RAW- 87-47 0.6 I. 5 

RAW- 86-47 0.8 0.9 

RAW- 85-47 1. 7 3.2 

RAW- 84.,.47 0.9 1. 5 

RAW- 83-47 0.9 8.8 

RAW- 82-47 2.1 5. 2 

RAW- 8I-47 I. 6 o. 7 

RAW- 80-47 I. 9 11.6 

RAW- 79-47 1.2 7. 8 

RAW- 78-47 0.7 3.4 

RAW- 77-47 I. I 9.4 

RAW- 76-47 I. 7 16.4 

RAW-. 75-47 0.5 13.0 

RAW- 74-47 0.6 2.8 

VEM-559-47 I. 8 I6.0 

VEM 558-47 2.2 10.2 

VEM-557-47 2.6 11.5 

VEM-556-47 0.9 19. 7 

VEM-555-47 0.8 18.2 

VEM 554-47 1. 0 22.9 

VEM-553-47 1. 8 26.3 

VEM-552-47 I.3 3I. 5 

VEM-55I-47 1.7 2I. 7 

VEM-550-47 1. 3 11.0 

VEM-549-47 1.6 12.0 

VEM-548-47 1. 4 13.8 

VEM-547-47 1.7 12.8 

VEM-546-47 1. 5 11.9 

VEM-545-47 0.9 I2.6 

VEM-544-47 1.5 1. 2 

VEM-543-47 1.0 4.6 

VEM-542-47 2.2 24.1 

VEM-54I-47 1. 7 25.5 

VEM-540-47 0.6 20.4 

VEM-539-47 0.4 15.0 

Chemical analyses (percent Cumulative Thickness x 

Al2o 3 Fe2o 3 F Loss on Acid thickness percent P 20 

ignition insoluble (feet) ( cumulativef 

-- -- -- -- 70.5 127.07 1, 478. 30 

-- -- -- -- 60.3 128.27 1, 488. 50 

-- -- -- -- 81. 7 I28.87 1, 489. 40 

-- -- -- -- 91. 7 129.67 1,490.12 

-- -- -- -- 80.7 I31.37 1,495.56 

-- -- -- -- 84.2 I32.27 1, 496. 91 

-- -- -- -- 64.2 133. 17 1, 504. 83 

-- -- -- -- 75.2 135.27 1,515.75 

-- -- -- -- 89.6 136.87 1, 516. 87 

-- -- -- -- 57. 1 138.77 1, 538. 9I 

-- -- -- -- 68.8 I39.97 I,548.27 

-- -- -- -- 82.0 140.67 1, 550. 65 

-- -- -- -- 64.2 I41. 77 I, 560.99 

-- -- -- -- 42.7 143.47 I, 588. 87 

-- -- -- -- 50.8 143.97 1, 595. 37 

-- -- -- -- 80.0 I44.57 1, 597. 05 

-- -- -- -- 40.9 146.37 1, 625. 85 

-- -- -- -- 57.4 I48.57 I, 648. 29 

-- -- -- -- 53.0 I51.17 1, 678. 19 

-- -- -- -- 35.8 152. 07 1, 695. 92 

-- -- -- -- 38.9 152. 87 1, 710. 48 

-- -- -- -- 24.9 153.87 1, 733. 38 

-- -- -- -- 18.2 155. 67 1, 780. 72 

-- -- -- -- 11.0 I 56. 97 I, 82I. 67 

-- -- -- -- 29.3 158.67 1, 858. 56 

-- -- -- -- 52.0 I59.97 1,. 872. 86 

-- -- -- -- 53.3 161.57 1, 892. 06 

-- -- -- -- 50.4 I62.97 1,9II.38 

-- -- -- -- 52.8 164.67 1, 933. 14 

-- -- -- -- 52.5 166.17 1, 950. 99 

-- -- -- -- 52.2 167.07 1, 962. 33 

-- -- -- -- 26.5 168.57 1, 964. 13 

-- -- 0.39 -- 44.5 169.57 1, 968. 73 

3.1 1.25 -- 8.12 24.8 171.77 2, 021. 75 

2.4 I. 08 2.35 9.14 20.8 I73.47 2.065.IO 

5.5 I. 81 -- 7.22 34.9 I74.07 2,077.34 

6.2 2.09 I. 52 7.28 48.7 I74.47 2, 083.34 
~ 

w 

P- 20 

P- 19 

P- 18 

P- 17 

P- 16 

P- 15 

P- 14 

P- 13 

P- 12 

P- 11 

P- 10 

P- 9 

P- 8 

P- 7 

P- 6 

P- 5 

P- 4 

P- 3 

P- 2 

P- 1 

Cw- 1 

Cw- 2 

Cw- 3 

Mudstone, phosphatic VEM-538-47 

Mudstone VEM-537-47 

Phosphate rock, argillaceous; 

fos. col. no. 47-HW-247 VEM-536-47 

Phosphate rock VEM-535-47 

Phosphate rock VEM-534-47 

Mudstone, phosphatic VEM-533-47 

Phosphate rock, argillaceous VEM-532-47 

Mudstone, phosphatic VEM-531-47 

Phosphate rock, argillaceous; 

fos. col. no. 47-HW-246 VEM-530-47 

Phosphate rock, argillaceous VEM-529-47 

Phosphate rock VEM-528-47 

Phosphate rock VEM-527-47 

Phosphate rock VEM-526-47 

Phosphate rock VEM-525-47 

Phosphate rock VEM-524-47 

Phosphate rock, argillaceous VEM-523-47 

Mudstone VEM-522-47 

Mudstone VEM-521-47 

Phosphate rock VEM-520-47 

Phosphate rock and mudstone VEM-519-47 

Dolomite; fos. col. no. 

47-HW-244 VEM-518-47 

Phosphate rock -- Dolomite; fos. col. no. 47-HW-245 --

1. 2 14. 1 6.9 

0.4 6.3 9.7 

1.8 27. 1 -- 1. 7 28.6 2.5 

1. 9 29.1 2.9 

0.5 12.8 8.0 

0.7 26.9 4.1 

0.5 15.9 6.9 

2.4 24.5 3.9 

0.8 21.4 5.9 

1.6 33.2 1.0 

1.2 32.7 1. 4 

1.3 33.7 1. 2 

1. 5 33.4 o. 53 

0.7 32.3 1. 7 

1.0 25.4 4.5 

1. 0 3.9 9.7 

z. 5 1. 2 10. 

0.6 33.7 1.4 

0.6 26.2 5. 1 

Wells formation 

3.2 1. 0 -- o. 1 -- --

4.0 -- --

2.30 1. 52 6.96 49.6 175. 67 2,100.26 

3. 17 0.62 5.36 70.7 176. 07 z. 102. 78 

-- -- 6.48 21. 7 177. 87 2, 151. 56 

1. 02 -- 6.12 18.8 179.57 2, zoo. 18 

1. 07 -- 6.54 19.2 181.47 2, 255.47 

2.40 -- 6.64 54.0 181.97 2, 261.87 

1.25 -- 5.70 22.2 182.67 2,280.70 

2.31 1. 59 7.44 43.9 183.17 2, 288. 65 

1.21 -- 6.50 26.2 185.57 2,347.45 

2.46 -- 5.34 33.9 186.37 2, 364. 57 

0.54 2.84 6.02 6.4 187.97 2,417.69 

0.66 -- 5.98 6.0 189.17 2, 456.93 

0.56 -- 5.64 4.4 190.47 2, 500. 74 

0.44 -- 7.08 4.9 191.97 2, 550. 84 

0.82 -- 5.86 8.4 192.67 2, 573.45 

1. 27 -- 6.46 22.9 193.67 2, 598.85 

4.18 -- 7.00 69.7 194.67 2, 602. 75 

3.61 -- ·5.32 78.7 197. 17 2,605.75 

0.66 3.33 4.06 7. 2 197.77 2, 625.97 

2.32 -- 5.02 19.0 198.37 2,641.69 

I 

-- -- -- 4.8 3. 2 3. 20 

-- -- -- -- 3. 3 --

I -- -- -- -- 7.3 --
,.p.. 

,.p.. 

WEST DAIRY, IDAHO. LOT NO. 1208. 

Phosphatic shale member and part of Rex member of Phosphoria formation sampled in bulldozer trench near SE corner of NEtSE! sec. 19, 

T. 9 S., R. 44 E., Caribou County, Idaho, on west limb of Dairy syncline. Beds strike N. 64• W. and dip as• NE. Section measured by 

F. C. Armstrong, V. E. McKelvey, L. E. Smith, and R. A. Weeks and sampled by 0. A. Payne and R. A. Smart in September 1947. Samples 

analyzed for P 20 5 and acid insoluble by U. S. Bureau of Mines Laboratory, Albany, Oregon, and for other constituents by Trace Elements 

Section Laboralory, U. S. Geological Survey,. Washington, D. C. 

Chemical analyses (percent) Cumulative Thickness x Bed Sample Thickness Rock description I 1 I ,, Loss on I Acid thickness percent P 20 no. no. (feet) P205 A 2°3 Fe203 ignition insoluble (feet) (cumulativef 

Rex member of Phosphoria formation- basal beds only 

R- 4 Mudstone and chert; fos. col. no. 47-HW-1391 FCA- 267-47 1.7 1.6 -- -- -- 89.4 1. 7 2.72 

R- 3 Chert FCA- 268-47 1. 0 o. 5 -- -- -- 93.9 2. 7 3.22 

R- 2 Mudstone and chert FCA- 269-47 0.25 1. 7 -·- -- -- 90.1 2.95 1.65 

R- 1 Chert, phosphatic FCA-.270-47 0.25 15.6 -- -- -- 53.1 3.20 7.55 

Phosphatic shale member of Phosphoria formation 

P-193 Mudstone, phosphatic · FCA- 271-47 0.2 8. 7 -- -- -- 58. 1 0.2 1.74 

P-192 Mudstone FCA- 272-47 0.8 o. 8 -- -- -- 78. 7 1. 0 2.38 

P-191 Mudstone, phosphatic ·FCA- 273-47 0.4 7. 8 -- -- -- 60. 1 1. 4 5.50 

P-190 Mudstone FCA- 281-47 1. 4 3.6 -- -- -- 70.8 2. 8 10.54 

P-189 Mudstone; fos. col. no. 47-HW-140 FCA:.. 280-47 2.9 1. 3 -- -- -- 75.0 5.7 14.31 

P-188 Mudstone; fos • .col. no. 47-HW-141 FCA- 279-47 1. 7 1. 8 -- -- -- 73.5 7. 4 17.37 

P-187 Mudstone; fos. col. no. 47-HW-142 FCA- 278=47 0.5 3.7 -- -- -- 70.2 7. 9 19.22 

P-186 Mudstone FCA- 277-47 0.9 3.2 -- -- -- 75.5 8. 8 22.10 

P-185 Mudstone, phosphatic FCA- 276-47 0.35 15. 7 -- -- -- 46.9 9.15 27.60 

P-184 Mudstone FCA- 275-47 1. 4 1. 7 -- -- -- 77.0 10.55 29.98 

P-183 Phosphate rock~ argillaceous FCA- 274-47 0.35 19.0 -- -- -- 37. 1 10.90 36.63 

P-182 Phosphate rock RAW- 1-47 0.2 32.5 -- -- -- 12. 7 ll. 10 43.13 

P-181 Mudstone RAW- 2-47 1.1 2.8 -- -- -- 73.0 12.20 46.21 

P-180 Mudstone; fos. col. no. 47-HW-I43 RAW- 3-47 0.9 0.6 -- -- -- 79.3 13.10 46.75 

P-179 Mudstone .RAW- 4-47 I. 5 4. 7 -- -- -- 67.5 14.60 53.80 

P-178 Mudstone; fos. col. no. 47-HW-144 RAW- 5-47 I. 3 2. 9 -- -- -- 73.7 15.90 57.57 

P-177 Phosphate rock RAW- 6-47 0.5 30.5 -- -- -- 15.3 16.40 72.82 

P-176 Mudstone RAW- 7-47 1.3 3. 7 -- -- -- 70.14 17.70 77.63 

P-175 Mudstone; fos. col. no. 47-HW-I45 RAW- 8-47 1. 6 I. 0 -- -- -- 80.9 19.30 79.23 

P-I74 Phosphate rock RAW- 9-47 0.5 32.3 1.8 0.40 4.98 11.4 19.80 95.38 

P-173 Phosphate rock RAW- 10-47 0.9 32.8 1. 7 0.45 5.18 9.4 20.70 124.90 

P-172 Phosphate rock RAW- ll-47 0.5 33.3 2.2 0.33 5.30 8. 7 2I.20 14I.55 

P-171 Phosphate rock RAW- I2-47 0.9 33.6 2.0 0.35 4.24 8. 7 22.10 171.79 

P-170 Mudstone, phosphatic RAW- I3-47 0.7 14. 5 1.8 2.50 6.62 48.6 22.80 I81.94 

P-169 Phosphate rock, argillaceous RAW- 14-47 o.s IS. 2 5.5 1. 83 6.40 40.9 23.60 196.50 
P-168 Phosphate rock, argillaceous RAW- 15-47 ·0.9 zo.z s.o 1. 65 5.80 36.6 Z4.50 I Z14.68 

P-167 Phosphate rock RAW- 16-47 0.7 33.9 l.Z 0.63 4.58 s. 8 zs.zo Z38.41 

P-166 Phosphate rock and phosphatic 

mudstone RAW- 17-47 1.0 16.9 7. 3 z.oo 5. 88 44.5 Z6.ZO I Z55.31 

P-165 Phosphate rock VEM-304-47 0.3 33.8 1. 5 0.70 4.Z4 9.0 Z6.50 Z65.45 

P-164 Phosphate rock and argillaceous 

phosphate rock VEM-303-47 l.O Z5.9 3.Z 1. 15 s.zo z5.6 Z7.50 I Z91.35 

P-163 Phosphate rock. argillaceous VEM-30Z-47 0.8 Z6. 1 3.9 1. Z6 6.86 Z1.0 Z8.30 31Z.Z3 

P-16Z Phosphate rock, argillaceous VEM-301-47 1. 3 zo.s s.z 1. 75 6.zo 37.0 Z9.60 338.88 

P-161 Phosphate rock, argillaceous VEM-300-47 0.3 Z0.9 6.6 1.85 7. 60 3Z.3 Z9.90 345.15 

P-160 Mudstone, phosphatic VEM-Z99-47 0.9 11.4 9.5 Z.91 8.Z4 53.3 30.80 355.41 

P-159 Phosphate rock and phosphatic 

mudstone VEM-Z98-47 0.7 1Z. 6 8.07 Z.73 8.3Z 50.3 31. 50 364.Z3 

P-158 Phosphate rock, argillaceous and 

phosphate rock YEM-Z97-47 0.7 Z3.0 5. 3 1. 63 5.88 Z9.5 3Z.ZO 380.33 

P-157 Phosphate rock VEM-Z96-47 0.4 3Z.~ 1. 3 0.59 4.98 10.6 3Z. 60 393.45 

P-156 Phosphate rock VEM-Z95-47 0.6 33.1 1.5 o.sz 4.70 10.0 33.ZO 413.31 

P-155 Phosphate rock VEM-Z94-47 l. 0 3Z.3 1. 9 0.68 5.88 10.4 34.ZO 445.61 

P-154 Phosphate rock VEM-Z93-47 0.8 Z8.1 Z.4 0.43 7.ZZ 17.6 35.00 468.09 

P-153 Phosphate rock, argillaceous RAG- 131-47 1. 0 zo. 1 5.7 1.68 13. 7 Z7. 4 36.00 488.19 

P-15Z Phosphate rock, argillaceous RAG- 130-47 1. 1 Z1. 4 5.Z 1.68 13.8 zs.o 37.10 511.73 

P-151 Phosphate rock, argillaceous RAG-1Z9-47 1. 5 Z3. 1 4.4 1. 58 13. 1 Z1.5 38.60 546.38 

~ P-150 Phosphate rock, argillaceous; fos. 01 col. no. 47-HW-146 RAG-1Z8-47 1.0 Zl. 9 5. 1 1.70 13.0 Z6.3 39.60 568.Z8 

P-149 Phosphate rock, argillaceous RAG-1Z7-47 I. zz 19.6 5. 7 z.o8 11.9 31.4 40.8Z 59Z.18 

P-148 Mudstone, phosphatic RAG- 1Z6-47 i.o5 15. 5 -- -- -- 39~Z 41.87 608.48 

P-147 Mudstone, phosphatic RAG- 1Z5-47 1. 5 1Z.4 -- -- -- 49.3 43.37 6Z7.08 

P-146 Mudstone RAG-108-47 0.95 7. 0 -- -- -- 68.6 44.3Z 633.73 

P-145 Mudstone RAG- 107-47 0.7 1. 7 -- -- -- 78.7 45. oz 634.9Z 

P-144 Mudstone, phosphatic; fos. col. no. 

47-HW-175 RAG- 1Z4-47 Z.6 13. z -- -- -- 49.4 47. 6Z 669.Z4 

P-143 Mudstone, phosphatic RMC- 89-47 1.Z 13.0 -- -- -- 53. 1 48.8Z 684.84 

P-14Z Mudstone RMC- 88-47 0.8 5. 6 -- -- -- 7Z.O 49.6Z 689.3Z 

P-141 Mudstone, phosphatic RMC- 87-47 1. 1 7. 9 -- -- -- 66.6 50.7Z 698.01' 

P-140 Mudstone, phosphatic; fos. col. no. 47-HW-147 RMC- 86-47 0.7 1Z. 3 -- -- -- 55. 7 51. 4Z 706.6Z 

P-139 I Mudstone RMC- 85-47 1. 0 1. 6 -- -- -- 78.Z 5Z.4Z 708.ZZ 

P-138 Mudstone. phosphatic RMC- 84-47 Z.4 8. 5 -- -- -- 70 .. 6 54.8Z 7Z8.6Z 

P-137 Mudstone RMC- 83-47 1.6 3. 3 -- -- -- 8Z.6 56.4Z 733.90 

P-136 Mudstone, phos}il.atic RMC- 8Z-47 0.9 10.9 -- -- -- 63.Z 57.3Z 743.71 

P-135 Mudstone, phosphatic VEM-310-47 0.7 1Z. 6 -- -- -- 56.0 58. oz 75Z.53 

P-134 Mudstone VEM-309-47 Z.3 7. 7 -- -- -- 71.0 60.3Z 770.Z4 

P-133 I Mudstone I VEM-308-4 7' 1. 8 5. 5 -- -- -- 75.5 6Z. 1Z I 780.14 

1 Fossil collection made by H. Wedow,. Paleontology and Stratigraphy Branch, U.S. Geological Survey. 
~ 

C» 

Bed 

no. 

P-132 

P-131 

P-130 

P-129 

P-128 

P-127 

P-126 

P-125 

P-124 

P-123 

P-122 

P-121 

P-120 

P-119 

P-118 

P~117 

P-116 

P-115 

P-114 

P-113 

P-112 

P-111 

P-110 

P-109 

P-108. 

P-107 

P-106 

P-105 

P-104 

P-103 

P-102 

P-101 

P-100 

P- 99 

P- 98 

P- 97 

P- 96 

P-· 95 

Rock description 

Mudstone 

Mudstone 

Mudstone 

Mudstone, phosphatic 

Phosphate rock~ argillaceous 

Mudstone~ phosphatic 

Mudstone 

Mudstone and phosphatic mudstone 

Mudstone; fos. col. no~ 47-HW-148 

Mudstone 

Mudstone, phosphatic; fos. col. no. 

47-HW-149 

Mudstone 

Mudstone~ phosphatic; fos. col. no. 

47-HW-150 

Mudstone~ phosphatic; fos. col. no. 

47-HW-150 

Mudstone, phosphatic 

Mudstone; fos. col. no. 47-HW-151 

Mudstone, phosphatic 

Mudstone 

Mudstone 

Mudstone 

Mudstone, phosphatic 

Mudstone 

Mudstone 

Mudstone 

Phosphate rock, argillaceous 

Mudstone 

Phosphate rock, argillaceous 

Phosphate rock, argillaceous 

Mudstone, phosphatic 

Mudstone; fos. col. no. 47-HW-136 

Mudstone,. phosphatic 

Mudstone 

Phosphate rock 

Mudstone and phosphatic mudstone 

Phosphate rock 

Mudstone 

Mudstone and phosphate rock 

Phosphate rack,. cherty 

Sample Thickness 

no. (feet) P2o5 

VEM-307-47 1.7 2.9 

VEM-306-47 1.9 2. 2 

VEM-305-47 2.0 3,8 

RAG- 138-47 0.51 8. 7 

RAG- 137-47 0,65 27. 1 

RAG- 136-47 1. 02 8. 7 

RAG- 135-47 1.25 6.6 

RAG- 134-47 0.4 15.6 

RAG- 133-47 2.15 6. 5 

RAG-132-47 0.6 3.5 

RAW- 24-47 1. 1 12.3 

RAW- 23-47 1.0 7. 1 

RAW- 22-47 0.8 9. 1 

RAW- 21-47 0.3 17.9 

RAW- 20-47 1.3 11.0 

RAW- 19-47 1. 2 4. 7 

RAW- 18-47 1.3 14.9 

FCA- 288-47 1.2 1. 0 

FCA- 287-47 1. 3 3.4 

FCA- 286-47 0.9 0.6 

FCA- 285-47 0.4 17.3 

FCA- 284-47 1.7 3. 0 

FCA- 283-47 0.8 4.7 

FCA- 282-47 1.0 0,8 

RMC- 81-47 0,3 29.1 

RMC- 80-47 0.75 3. 7 

RAG- 106-47 0.3 23.6 

RAG- 105-47 0.8 o. 2 

RAG- 104-47 0.4 8. 0 

RAG- 103-47 0.75 0.4 

RAG-102-47 0.75 11.0 

RAG- 101-47 1,05 2. 8 

RAG- 100-47 0.9 32.3 

RAG- 99-47 0.85 9. 1 

VEM-288-47 0.9 33.5 

VEM-287-47 3.8 0.9 

VEM-286-47 0.8 10.6 

VEM-285-47 1.3 27.0 

Chemical analyses (percent) Cumulative Thickness x 

Loss on Acid Thick percent P 20 Al2o 3 Fe o~ ignition insoluble (feet) (cumulativef 

-- -- 83.6 63.82 785. 07 

-- -- -- 77.8 65.72 789.25 

-- -- -- 81. 1 67.72 796. 85 

-- -- -- 63.8 68.23 801.29 

-- -- -- 26.9 68.88 818.89 

-- -- -- 64.3 69.90 827.75 

-- -- -- 71.9 71. 15 836.00 

-- -- -- 49.2 71.55 842.24 

-- -- -- 71.2 73.70 .856. 23 

-- -- -- 71.4 74.30 858.33 

-- -- -- 58.6 75.40 871,86 

-- -- -- 66.3 76.40 878.96 

-- -- -- 65.2 77.20 886.24 

-- -- -- 46.6 77.50 891.61 

-- -- -- 54.6 78.80 905. 91 

-- -- -- 73.2 80.00 911. 55 

-- -- -- 52.0 81,30 930.92 

-- -- -- 28.0 82.50 932.12 

-- -- -- 80.3 83.80 936.54 

-- -- -- 90.5 84.70 937.08 

-- -- -- 45. 1 85. 10 944:.00 

-- -- -- 82.5 86.80 949. 1.0 

-- -- -- 76.7 87.60 952.86 

-- -- -- 89.8 88.60 953.66 

-- -- -- 20.0 88.90 962.39 

-- -- -- 78.3 89.65 965. 17 

-- -- -- 32.8 89.95 972.25 

-- -- -- 91.4 90.75 972.4:1 

-- -- -- 69.4 91. 15 975.61 

-- -- -- 90.0 91.90 975.91 

-- -- -- 62.6 92.65 984:. 16 . 

-- -- -- 82.0 93.70 987. 10 

-- -- -- 12. 2 94.60 1~ 016. 17 

-- -- -- 69.4 95.45 1, 023.91 

-- -- -- 9.9 96.35 1, 054. 06 

-- -- -- 89.4 100.15 1,057.48 

-- -- -- 62.3 100.95 1, 065. 96 

-- -- -- 25.8 102.25 1,.069.47 
P- 94 I Phosphate rock, sandy; fos. col. no. 

47-HW-135 RMC- 75-47 0.4 Z8.0 -- -- -- Z3.0 10Z.65 1,080.67 

P- 931 Mudstone, phosphatic RMC- 74-47 0.4 15.4 -- -- -- 47.6 103.05 1, 086. 83 

P- 9Z Mudstone, phosphatic; fos. col. no. 

47-HW-137 RMC- 73-47 0.9 9.Z -- -- -- 65.9 103.95 1, 095. 11 

P- 91 I Mudstone, phosphatic and phosphate 

rock; fos. col. no. 4 7-HW-134 RMC- 7Z-47 0.3 9.7 -- -- -- 61. 1 104.Z5 1, 098. oz 

P- 90 I Mudstone and phosphatic mudstone RMC- 71-47 0.7 6.0 -- -- -- 70.5 104.95 1, lOZ. ZZ 

P- 89 MudstoriE!, ~hosphatic RMC- 79-47 O.Z5 8. 6 -- -- -- 53.9 105.ZO 1, 104. 37 

P- 88 Mudstone RMC- 78-47 0.5 3.9 -- -- -- 74.7 105.70 1, 106. 3Z 

P- 87 Mudstonl:f- RMC- 77-47 0.4 1. 6 -- -- -- 81.9 106.10 1, 106. 96 

P- 86 Mudstone and phosphatic mudstone RMC- 76-47 1. 0 7. 7 ~- -- -- 64.3 107. 10 1, 114. 66 

P- 85 Phosphate rock, argillaceous FCA- Z66-47 0.9 Z3.Z -- -- -- Z5.0 108.00 1, 135. 54 

P- 84 Mudstone, phosphatic FCA- Z65-47 0.5 1Z. 1 -- -- -- 54.0 108.50 1, 141. 59 

P- 83 Mudstone, phosphatic FCA- Z64-47 0.9 15. 1 -- -- -- 41. z 109.40 1, 155. 18 

P- 8Z Mudstone FCA- Z63-47 0.9 4.7 -- -- -- 69.6 110.30 1, 159. 41 

P- 81 Phosphate rock, argillaceous FCA- Z6Z-47 0.4 15.Z -- -- -- 38. 1 110. 70 1, 165. 49 

P- 80 Phosphate rock, argillaceous FCA- Z61-47 0.4 19.7 -- -- -- 30.3 11I. 10 I, 173.37 

P- 791 Mudstone, phosphatic FCA- Z60-47 1.8 13. 7 -- -- -- 44.0 llZ. 90 I, I98. 03 

P- 78 Mudstone, phosphatic; fos. col. no. 47-HW-133 FCA- Z59-47 1. 6 10.3 -- -- -- 55.0 1I4.50 I, Zl4. 51 

P- 771 Mudstone RAG- 98-47 I. 45 3. 8 -- -- -- 75.0 115.95 I., zzo. OI 

~ P- 76 Mudstone RAG- 97-47 O.Z8 0.5 -- -- -- 93.8 116. Z3 I, ZZO. 15 -.::! P- 75 Chert RAG- 96-47 0.35 o. 7 -- -- -- 93.3 1I6.58 I, ZZO. 40 

P- 74 Mudstone RAG- 95-47 0.63 z. 1 -- -- -- 85. 1 117.ZI 1, ZZl. 7Z 

P- 73 Mudstone RAG- 94-47 0.75 4. 1 -- -- -- 74.3 117.96 1, ZZ4. 80 

P- 7Z Mudstone RAG- 93-47 1.8 3.5 -- -- -- 73.8 119. 76 1, Z31. 10 

P- 71 Mudstone RAG- 9Z-47 0.69 4. 1 -- -- -- 71.8 IZ0.45 1, Z33. 9Z 

P- 70 Mudstone RAG- 9I-47 1. 6 1.1 -- -- -- 84.8 1ZZ.05 I, Z35. 68 

P- 69 Mudstone and phosphate rock RMC- 70-47 0.63 3. 5 -- -- -- 76.9 1ZZ.68 1, Z37. 89 

P- 68 Mudstone and phosphate rock RMC- 69-47 0.8 8.0 -- -- -- 59.Z 1Z3.48 1, Z44. Z9 

·p- 67 Mudstone; fos. col. no. 47-HW-13Z RMC- 68-47 1. 4 3. z -- -- -- 79.0 1Z4.88 I, Z48. 77 

P- 66 Mudstone RMC- 67-47 0.5 4.4 -- -- -- 77. z 1Z5.38 1, Z50. 97 

P- 65 Mudstone, phosphatic RMC- 66-47 0.5 8. 7 -- -- -- 61.8 I Z5. 88 I, Z55. 3Z 

P- 64 Mudstone RMC- 65-47 1. 0 l.Z -- -- -- 85.5 IZ6.88 1, Z56. 5Z 

P- 63 Mudstone RMC- 64-47 0.7 0.6 -- -- -- 86.3 IZ7. 58 1, Z56~ 94 

P- 6Z Mudstone, phosphatic FCA- Z58-47 1. 7 8. 7 -- ,- -- 59.5 1Z9.Z8 1, Z7I. 73 

P- 61 Mudstone, phosphatic FCA- Z57-47 1. 4 lZ.O -- -- -- 5Z. 7 130.68 1, Z88. 53 

P- 60 Mudstone FCA- Z56-47 0.85 4.6 -- -- -- 74.8 131. 53 1, Z9Z. 44 

P- 59 Mudstone FCA- Z55-47 0.7 5.6 -- -- -- 68. 5 I3Z.Z3 I, Z96. 36 

P- 58 Mudstone, phosphatic FCA- Z54-47 0.5 8. 7 -- -- -- 63.4 I3Z.73 I, 300. 71 

P- 57 Mudstone, phosphatic FCA- Z53-47 1.0 11.0 -- -- -- 56.5 133.73 1, 311. 71 

P- 56 Mudstone, phosphatic FCA- Z5Z-47 z.o 15. 1 -- -- -- 45.6 135.73 1, 341. 91 

P- 55 Mudstone, phosphatic FCA- Z51-47 1. 1 11.5 -- -- -- 53.7 136.83 1, 354. 56 
~ 

(X) 

Bed 

no. 

P- 54 

P- 53 

P- 5Z 

P- 51 

P- 50 

P- 49 

P- 48 

P- 47 

P- 46 

P- 45 

P- 44 

P- 43 

P- 4Z 

P- 41 

P- 40 

P- 39 

P- 38 

P- 37 

P- 36 

P- 35 

P- 34 

P- 33 

P- 3Z 

P- 31 

P- 30 

P- Z9 

P- Z8 

P- Z7 

P- Z6 

P- Z5 

P- Z4 

P- Z3 

P- ZZ 

P- Zl 

P- ZO 

P- 19 

P- 18 

P- 17 

P- 16 

Rock description 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone. phosphatic 

Mudstone, phosphatic 

Mudstone, phosphatic 

Phosphate rock, argillaceous 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock, argillaceous 

Phosphate rock and mudstone 

Phosphate rock 

Phosphate rock 

Phosphate rock and mudstone 

Phosphate rock 

Mudstone, phosphatic, and argillaceous 

phosphate rock 

Phosphate rock and phosphatic mudstone 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone, phosphatic 

Mudstone, phosphatic; fos. col. no. 47-HW-131 

Mudstone. phosphatic 

Mudstone, phosphatic 

Mudstone 

Mudstone. phosphatic 

Phosphate rock and mudstone; fos. 

col. no. 47-HW-138 

Phosphate rock and mudstone 

Phosphate rock 

Phosphate rock, argillaceous 

Phosphate rock, argillaceous 

Mudstone, p~osphatic 

Phosphate rock 

Phosphate rock. argillaceous 

Phosphate rock 

Mudstone, phosphatic 

Phosphate rock and mudstone 

Phosphate rock, argillaceous 

Phosphate rock, argillaceous 

Phosphate rock. argillaceous 

Sample Thickness 

no. (feet) Pz05 

VEM-Z84-47 1. 4 11.9 

VEM-Z83-47 1.1 lZ. 4 

VEM-ZSZ-47 1.5 14. 7 

VEM-Z81-47 z.o ll. z 

VEM-ZS0-47 z.o 13. 5 

VEM-Z79-47 0.9 Zl. 6 

VEM-Z78-47 0.8 zs. 1 

VEM-Z77-47 0.7 31.4 

VEM-Z76-47 0.5 35.3 

VEM-Z75-47 0.3 Z7. 6 

LES- 4Z5-47 0.75 18.6 

LES- 4Z4-47 0.'5 31.6 

LES- 4,Z3-47 0.8 33.5 

LES- 4ZZ-47 1. 0 Z4.0 

LES- 4Zl-47 1.15 30.8 

'LES- 4Z0-47 0.85 17.6 

LES- 419-47 0.5 Zl.3 

LES- 418-47 0.45 16.4 

LES- 417-47 0.9 ll. 4 

LES- 416-47 z.z 13.8 

LES- 415-47 0.45 10.4 

LES- 414-47 0.65 14.4 

LES- 413-47 0.65 7. 8 

LES- 41Z-47 0.5 z. 7 

LES- 4ll-47 0.3 15. z 

RMC- 63-47 0.9 zz.z 

RMC- 6Z-47 1. 3 Z8.9 

RMC- 61-47 0.75 Z9.5 

FCA- Z50-47 0.4 Z5. 6 

FCA- Z49-47 0.9 Z7. Z 

FCA- Z48-47 1.3 14.Z 

FCA- Z47-47 1. Z5 Z9.Z 

FCA- Z46-47 1. 05 Z6.7 

RAG- 90-47 1.75 zs. 5 

RAG- 89-47 0.88 15. 1 

RAG- 88-47 1. z Z5. 0 

RAG- 87-47 1. 5 Z5. 1 

RAG- 86-47 0.6 ZZ.7 

RAG- 85-47 0.5Z Z4.5 

Chemical analyses (percent) Cumulative Thickness x 

Al2o3 Fe2o3 

Loss on Acfd thickness percent PzO 

ignition insoluble (feet) ( cumulativef 

-- -- -- 55.0 138.Z3 1. 371. zz 

-- -- -- 53.0 139.33 1, 384. 86 

-- -- -- 46.9 140.83 1,406.91 

-- -- -- 56. 1 14Z.83 1. 4Z9. 31 

-- -- -- 50.3 144.83 1, 456. 31 

7. 5 Z.83 5.06 34.7 145. 73 1. 475. 75 

5.Z 1. 75 3.94 19.4 146.53 1. 498. Z3 

1. 1 0.15 3.ZZ 14.Z 147.Z3 1. 5ZO. Zl 

z.o 1. 13 z.zo 6. 7 147. 73 1. 537. 86 

4.4 Z.60 4.18 Z0.9 148.03 1, 546. 14 

7.8 3.31 6.38 38.3 148.78 11 560. 09 

Z.4· 1.66 5.0Z lZ.l 149.Z8 1.575.89 

Z.7 1.Z 3.0Z 10.6 150.08 1, 60Z. 69 

7.3 1. 99 6.34 Z7. 9 151.08 1. 6Z6. 69 

1. 6 1. Z8 3.94 16.Z 15Z.Z3 1. 66Z. ll 

7. 1 Z.55 7.06 41.8 153.08 1, 677.06 

4.7 Z.34 6.68 33.4 153.58 1, 687. 71 

6.7 Z.5Z 6.Z8 48.1 154.03 1, 695. 09 

-- -- -- 57.5 154.93 1, 705. 35 

-- -- -- 50.8 157.13 1. 735. 71 

-- -- -- 56.9 157. 58 1. 740. 39 

-- -- -- 49.3 158.Z3 1. 749. 75 

-- -- -- 64.4 158. 8·8 1. 754. sz 

.-- -- -- 77. z 159.38 1. 756.17 

-- -- -- 46.8 159.68 1. 760. 73 

4.3 1. 50 5.86 3Z.5 160.58 1, 780. 71 

0.66 o.zs 5.04 17.3 161.88 1,818.Z8 

z.s 0.83 4.64 17.6 16Z.63 1. 840.43 

4~Z 1. Z9 4.78 Z6. 5 163.03 1, 850. 67 

3.6 1. 4Z 4.78 Z3.7 163.93 1, 875. 15 

7.8 1.99 6.90 51.4 165.Z3 1. 893. 61 

Z.7 1. lZ 6.34 17.0 166.48 1. 9Z8. 65 

3.6 l.Z6 6.34 Z4.4 167. 53 1. 956. 65 

6.7 o. 70" 7~Z6 17.6 169.Z8 z, 006. 65 

Z.4 1. 75 6.70 50.6 170.16 z, 019.94 

4.7 1. Z4 6.08 Z6.4 171.36 Z,049.94 

5.5 l.ZS 7.14 Z4.8 17Z.86 z, 087. 59 

4.1 1.37 4.46 34.5 173.46 z. 101. Zl 

3.9 1. 5Z 4.40 31.0 173.98 Z,ll3.96 
~ 

(() 

P- 15 

P- 14 

P- 13 

P- 1Z 

P- 11 

P- 10 

p .. 9 

p .. 8 

P- 7 

p .. 6 

P- 5 

P- 4 

p .. 3 

P- z 

p .. 1 

Cw-lZ 

Cw-11 

Cw-10 

Cw- 9 

Cw- 8 

Cw- 7 

Cw- 6 

Cw- 5 

Cw-4 

Cw- 3 

Cw- Z 

Cw- 1 

Phosphate rock 

Phosphate rock 

Phosphate rock and phosphatic mudstone 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock, argillaceous 

Phosphate rock 

Mudstone 

Mudstone, phosphatic 

Mudstone 

Mudstone 

Mudstone 

Phosphate rock and phosphatic mudstone; 

fos. col. no. 47-HW-130 

Mudstone, contains limestone nodules 

Limestone; fos. col. no. 47-HW-1Z6 

Limestone; fos. col. no. 47-HW-1Z7 

Limestone and mudstone; fos. col. no. 47-HW-1Z8 

Limestone; fos. col. no. 47-HW-1Z9 

Chert 

Limestone 

Limestone 

Limestone 

Limestone 

Chert 

Limestone 

RAG- 84-47 0.66 30.1 

RAG- 83-47 1. z 3Z. 1 

RAG- SZ-47 0.9 31.6 

RAG- 81-47 0.97 31. 7 

RAG- 80-47 0.9Z 3Z. 1 

RAG- 79-47 1. 05 34.3 

RAG- 78-47 .1. z 33.6 

LES- 410-47 0.35 Z5.8 

LES- 409-47 0.6 Z7. 6 

LES- 408-47 0.6 4.3 

LES- 407-47 0.6 8.9 

LES- 406-47 1. 5 1. 5 

LES- 405-47 1. 1 1. z 

LES- 404-47 1.Z z. 3 

LES- 403-47 0.4 34.7 

Wells formation 

LES- 40Z-47 0.3 5. 4 

LES- 401-47 z.s o. 7 

-- 0.8 --

-- z.o -- -- 3.3 --

-- 0.9 -- -- 4.5 -- -- 3.0 -- -- 1. 8 -- -- 0.5 --

-- 0.7 -- -- -- --

Z.5 1. 13 5.84 14.5 174.64 z, 133. 86 

z.s 0.91 6.50 9.4 175.84 Z, 17Z. 38 

1. 8 0.91 6.56 9.9 176.74 z. zoo. sz 

1. 9 0.89 6.Z8 9. 1 177. 71 Z, Z3Z. 5Z 

Z.4 0.93 6.1Z 8. 1 178.63 Z,Z6Z.05 

1. 3 o. 71 5.76 4.3 179.68 Z, Z98. 05 

1.0 0.67 5.78 6. 0 180.88 z, 338. 37 

3.3 1. Z4 5. 50 zz.z 181. Z3 z. 347.41 

z.o 0.84 5.8Z 18.9 181.83 z, 363. 97 

-- -- -- 65.Z 18Z.43 z, 366. 55 

-- -- -- 58.7 '183. 03 Z,371.89 

-- -- -- 79.Z 184.53 z, 374. 14 .... -- -- 79.8 185.63 Z,375.46 

-- -- -- 76. 1 186.83 z, 378. zz 

-- -- -- 6. 5 187.Z3 Z, 39Z. 10 

-- -- -- 46.8 0.3 1. 6Z 

-- -- -- 5. 0 3. 1 3.58 

-- -- -- -- 3.9 --

-- -- -- -- 5. 9 -- -- -- -- -- 9.Z --

-- -- -- -- 10. 1 -- .... -- -- -- 14.6 -- -- -- -- -- 17.6 -- -- -- -- -- 19.4 -- -- -- -- -- 19.9 --

-- -- -- -- Z0.6 -- .... -- -- -- -- --
CJ1 

0 

MONTPELIER CANYON, IDAHO. LOT NOS. 1207 AND 1236. 

Phosphoria formation measured and sampled in hand trenches on westward-dipping fault block, northwest side of Montpelier Canyon three miles 

east of Montpelier, sec. 31, T. 12 S., R. 45 E., Bear Lake County, Idaho. Most of section (lot no. 1207) measured in long trench, exposing strata that 

strike N. 18° E. and dip 29° W., by F. C. Armstrong, R. M. Campbell, R. A. Gulbrandsen, and R. A. Hoppin and sampled by Campbell, 0. A. Payne, 

R. A. Smart, and R. S. Sears during August 1947. Lower part of phosphatic shale (lot no. 1236) measured in two trenches 425 feet to the southwest 

exposing strata that strike N. 32° E. and dip 30° NW., by R. A. Gulbrandsen and R. P. Sheldon and sampled by R. A. Smart in September 1948. Samples 

analyzed for P 20 5, F, and acid insoluble by U. S. Bureau of Mines Laboratory, Albany, Oregon, and for other constituents by Trace Elements 

Laboratory, U. S. Geological Survey, Washington, D. C. ·' 

Bed Rock desgription no. 

'ltd- 1 I Limestone, argillacepus; fos. 

col. no. 47-HW-187 

u- 12 Chert, phosphatic; fos. col. 

no. 47-HW-186 

u- 11 Limestone, argillaceous 

u- 10 Mudstone, calcareous 

u- 9 Mudstone 

u- 8 Mudstone 

u- 7 Mudstone 

u- 6 Limestone, argillaceous 

u- 5 Mudstone 

u- 4 Limestone, argillaceous 

u- 3 Chert 

u- 2 Chert, calcareous 

u- 1 Mudstone 

R- 27 Limestone, ·cherty; fos. col. 

no. 47-HW-185 

R- 26 Limestone, cherty; fos. col. 

no. 47-HW-184 

R- 25 Chert, calcareous; fos. col. 

no. 47-HW-183 

R- 24 Chert, calcareous 

R- 23 Chert, calcareous 

R- 22 Chert, calcareous 

R- 21 Chert, calcareous 

Chemical analyses (percent Sample Thickness 

P20siA12o3JFe2o3f I Losson no. (feet) F ignition 

Dinwoody formation--basal bed only-lot no. 1207 

RAH-242-47 

Upper shale member of Phosphoria formation-lot no. 1207 

RAH-243-47 o.s 16.3 -- -- -- -- RAH-244-47 2. 1 1. 6 -- -- -- -- RAH-245-47 2.9 o. 7 -- -- -- -- RAH-246-47 3.4 1. 4 -- -- -- -- RAH-247-47 1. 2 1. 5 -- -- -- --

RAH-248-47 1. 6 2.4 -- -- -- -- RAH-249-47 1.3 1. 2 -- -- -- -- RAH-250-47 2.6 1. 3 -- -- -- -- RAH-251-47 2.6 o. 9 -- -- -- -- RAH-252-47 2. 1 1.4 -- -- -- --

RAH-253-47 4.7 1.5 -- -- -- -- RAH-254-47 5.0 2. 9 -- -- -- -- Rex member of Phosphoria formation-lot no. 1207 

RAH-255-47 2.5 0.6 -- -- -- -- RAH-256-47 2.2 o. 6 -- -- -- -- RAH-257-47 9.8 0.4 -- -- -- --· RAH-258-47 9.6 0.6 -- -- -- -- RAH-259-47 9.0 o. 5 -- -- --. -- RAH-260-47 9.3 0.4 -- -- -- -- RAH-261-47 12.5 o. 3 -- -- -- --

Cumulative Thickness x 

Acid thiCkness percent p of insoluble {feet) (cumulati~e 

4.0 3.20 

44.6 o. 5 8. 15 

29.3 2.6 11. 51 

52.4 5. 5 13.54 

69.8 8. 9 18.30 

68.0 10. 1 20.10. 

70.6 11.7 23.94 

40.8 13.0 25.50 

75.9 15.6 28.88 

37.9 18.2 31.22 

82.0 20.3 34.16 

61. 1 25.0 41.21 

64.9 30.0 55.71 

35.4 2. 5 1.5 

45.9 4. 7 2.82 

64.4 14.5 6.74 

75.2 24.1 12.50 

71. 1 33.1 17.00 

76.6 42.4 20.72 

68.6 54.9 24.47 
01 

..... 

R- ZO 

R- 19 

R- 18 

R- 17 

R- 16 

R- 15 

R- 14 

R- 13 

R- lZ 

R- 11 

R- 10 

R- 9 

R- 8 

R- 7 

R- 6 

R- 5 

R- 4 

R- 3 

R- z 

R- 1 

P-168 

P-167 

P-166 

P-165 

P-164 

P-163 

P-16Z 

P-161 

P-i60 

P-159 

P-158 

P-157 

P-156 

P-155 

P-154 

P-153 

P-15Z 

-· Chert~ calcareous RAH-Z6Z-47 7. 0 o. 5 -- -- -- -- 74.7 

Chert1 calcareous RAH-Z63-47 1Z.8 0.8 -- -- -- -- 76.8 

Limestone 1 cherty RAH-Z64-47 4.0 0.5 -- -- -- -- 4Z.l 

Limestone~ cherty RAH-Z65-47 6.0 o. 5 -- -- -- -- 47.4 

Chert, calcareous RAH-Z66-47 8.9 0.4 -- -- -- -- 70.0 

Limestone, argillaceous RAH-Z67-47 5. z o. 5 -- -- -- -- 33.5 

Chert and limestone RAH-Z68-47 4.4 0.6 -- -- -- -- 67.0 

Chert1 calcareous RAH-Z69-47 4.5 0.3 -- -- -- -- 53.5 

Chert and limestone RAH-Z70-47. 3.5 0.4 -- -- -- -- 48.6 

Limestone and chert RAH-Z71-47 3.8 0.3 -- -- -- -- 46.8 

Limestone and chert; fos. col. no. 47-HW-lSZ RAH-Z7Z-47 4.3 0.4 -- -- -- -- 33.4 

Chert1 calcareous RAH-Z73-47 3.0 0.5 -- -- -- -- 73.4 

Limestone and chert RAH-Z74-47 Z.9 0.4 -- -- -- -- 50.6 

Chert and limestone RAH-Z75-47 5.0 o. 3 -- -- -- -- 53.7 

Limestone and chert RAG- 51-47 3.65 0.4 -- -- -- -- 36.8 

Chert, calcareous RAG- 64-47 0.6 0.4 -- -- -- -- 69.Z 

Chert RAG- 63-47 0.35 0.8 -- -- -- -- 70.5 

Limestone~ cherty RAG- 6Z-47 0.4 o. 5 -- -- -- -- 38.6 

Limestone~ argillaceous FCA-Z09-47 1.0 o. 8 -- -- -- -- Zl.Z 

Chert1 calcareous FCA-Zl0-47 0.3 0.9 - -- -- -- 76. 1 

Phosphatic shale member of Phosphoria formation-lot nos. 1Z07 and 1Z36 

Lot no. 1Z07 

Phosphate rock~ argillac~ous FCA-Z11-47 0.9 Zl. Z -- -- -- -- 3Z.4 

Mudstone 1 calcareous; fos. col. 

no. 47-HW-65 FCA-ZlZ-47 1. 6 l.Z -- -- -- -- 68.7 

Mudstone; fos. col. no. 47-HW-68 FCA-Zl3-47 1.1 Z.5 -- -- -- -- 64.6 

Mudstone~ calcareous FCA-Zl4-47 0.7 6. 3 -- -- -- -- 57.5 

Mudstone FCA-Zl5-47 0.8 3. 7 -- -- -- -- 65.9 

Mudstone FCA-Zl6-47 Z.8 o. 7 -- -- -- -- 79.5 

Mudstone FCA-Zl7-47 0.8 1. 3 -- -- -- -- 75.8 

Mudstone~ calcareous FCA-ZOS-47 0.6 o. 5 -- -- -- -- 67.7 

Mudstone~ calcareous; fos. 

col. no. 47-HW-67 FCA-Z07-47 0.6 4.8 -- -- -- -- 58.8 

Mudstone~ calcareous; fos. 

col. no. 4 7-HW-66 FCA-Z06-47 1. z z. 4 -- -- -- -- 66. 7 

Limestone; fos. col. no. 47-HW-69 FCA-Z05-47 1.8 3. 7 -- -- -- -- 14.9 

Phosphate rock1 argillaceous FCA-Z04-47 0.3 16. 6 -- -- -- -- 37.7 

Mudstone~ calcareous FCA-Z03-47 1. 5 5. 1 -- -- -- -- 6Z.4 

Mudstone~ calcareous FCA-ZOZ-47 0.6 7. 0 -- -- -- -- 59.1 

Mudstone FCA-ZOl-47 1.0 o. 7 -- -- -- -- 7Z.O 

Mudstone FCA-188-47 0.4 5. 7 -- -- -- -- 6Z.5 

Mudstone FCA-187-47 0.6 o. 6 -- -- -- -- 70.0 

1 Fossil collection made by H. Wedow~ Paleontology and Stratigraphy Branch, U. S. Geological Survey. 

61.9 Z7. 97 

74. 7 38.Zl 

78.7 40.Zl 

84.7 43.Zl 

93.6 45.77 

98.8 48.37 

103.Z 51.01 

107.7 5Z.36 

111. z 53.76 

115.0 54.90 

119.3 56.6Z 

1ZZ.3 58. lZ 

1Z5. Z 59.Z8 

130.Z 60.78 

133.85 6Z.Z4 

134.45 6Z.48 

134.80 6Z.76 

135.ZO 6Z.96 

136.ZO 63.76 

136.50 64.03 

0.9 19.08 

z. 5 Zl.OO 

3.6 Z3.75 

4. 3 Z8.16 

5. 1 31.1Z 

7. 9 33.08 

8. 7 34.1Z 

9.3 34.4Z 

9.9 37.30 

11. 1 40.18 

1Z.9 46.84 

13.Z 51. 8Z 

14.7 59.47 

15. 3 63.67 

16.3 64.37 

16.7 66.65 

17.3 67.01 
C,J'I 

M 

Bed 

no. 

P-151 

P-150 

P-149 

P-148 

P-147 

P-146 

P-145 

P-144 

P-143 

P-142 

P-141 

P-140 

P-139 

P-138 

P-137 

P-136 

P-135 

P-134 

P-133 

P-132 

P-131 

P-130 

P-129 

P-128 

P-127 

P-126 

P-125 

P-124 

P-123 

P-122 

P-121 

P-120 

P-119 

P-118 

P-117 

P-116 

P-115 

P-114 

Rock description 

Limestone. argillaceous; fos. 

col. no. 47-HW-70 

!4udstone. calcareous 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Limestone, . phosphatic 

Phosphate rock 

Phosphate rock. argillaceous 

Mudstone. calcareous 

Phosphate rock. argillaceous 

Limestone. argillaceous; fos. 

col. no. 47-HW-181 

Mudstone. phosphatic 

Limestone. argHlaceous; 

fos. col. no. 47-HW-180 

Phosphate rock 

!4udstone. calcareous 

Phosphate rock 

Limestone 

Phosphate rock 

Phosphate rock, argillaceous 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock. argillaceous 

Phosphate rock 

Phosphate rock, calcareous. 

argillaceous 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock. argillaceous 

Sample Thickness 

no. (feet) P205 

FCA-200-47 1. 4 o. 7 

FCA-199-47 0.65 3.4 

FCA-198-47 0.8 31.3 

FCA-197-47 0.75 33.1 

FCA-196-47 0.5 30.9 

FCA-195-47 0.5 12. 1 

FCA-194-47 1.2 33.3 

FCA-193-47 0.18 22.9 

FCA-192-47 0.55 2.4 

FCA-191-47 0.35 18.9 

FCA-190-47 0.8 2. 6 

FCA-189-47 o·.4 8. 7 

FCA-165-47 1.1 1. 1 

FCA-164-47 0.8 27.2 

FCA-163-47 0.65 5. 7 

FCA-162-47 0.55 34.2 

FCA-i61-47 0.65 4.9 

FCA-160-47 0.4 35.7 

FCA-159-47 0.3 26.8 

FCA-113-47 0.55 33.8 

FCA-112-47 1. 0 36.4 

FCA-147-47 . 1. 0 33.8 

FCA-146-47 0.95 17.4 

FCA-145-47 0.28 27.8 

FCA- 49-47 0.6 15.0 

FCA- 50-47 0.4 33.0 

FCA- 51-47 0.75 28.0 

FCA- 52-47 0.5 36.2 

FCA- 53-47 0.5 36.2 

FCA- 54-47 0.4 34.4 

FCA- 64-47 0.67 35.2 

FCA- 65-47 0.35 32. 1 

FCA- 66-47 0.4 25.9 

FCA- 67-47 0.6 26~0 

. FCA- 68-47 0.4 28.6 

FCA- 69-47 0.4 32.8 

FCA-148-47 0.8 28.0 

FCA-149-47 0.4 24. 1 

Chemical analyses (percent Cumulative Thickness x 

Loss on Acid thickness percent P 20 Al2o3 Fe2o3 F ignition insoluble (feet) ( cumulativef 

-- -- - -- 45.6 18.7 67.99 

-- -- -- -- 64.2 19.35 70.20 

0.49 ,0.43 3.30 9.42 3. 7 20.15 95.24 

0.8 0.34 3.54 6.48 5. 7 20.90 120.04 

1. 1 04.3 3.26 7.82 7. 9 21.40 135.49 

0.3 0.08 -- 29.16 3.8 21.90 141. 54 

0.3 0.25 -- 6.38 4.8 23.10 181. 50 

-- -- -- -- 29.3 23.28 185.62 

-- -- -- -- 47.1 23.83 186.94 

-- -- -- -- 30.9 24.18 193. 55 

-- -- -- -- 35.8 24.98 195. 63 

-- -- -- -- 55.9 25.38 199.61 

-- -- -- -- 35.2 26.48 200~82 

2.3 1.18 -- 6.54 16.3 27.28 222.58 

6. 1 2.28 -- 17.82 42.8 27.93 226.28 

0.57 0.39 -- 5.60 4.7 28.48 245.08 

1.4 0.43 -- 32.96 12.0 29.13 248. 26 

0.7 0.41 -- 4.10 3.9 29.53 262.54 

3.7 1. 50 -- 4.34 21.9 29.83 270.58 

1.1 0.86 -- 4.54 '6. 7 30.38 291.96 

0.4 0.30 -- 3.38 3. 3 31.38 328.36 

0.8 0.58 -- 4.84 5. 8 32.38 362.16 

7.0 2.3 -- 6.44 40.3 33.33 378.81 

2.4 1. 12 -- 9.44 13.2 33.61 386.61 

6.0 1.7 1. 41 15.22 29.0 34.21 395.61 

1. 8 1. 1 -- 5.40 8. 3 34.61 396.93 

1. 0 0.55 -- 6.32 8.6 35.36 417.93 

0.9 0.56 -.- 4.96 1. 8 35.86 436.03 

0.8 0.48 -- 4.72 1. 9 36.36 454. 13 

1. 4 0.66 -- 5.92 4.6 36.76 46,7. 89 

0.8 0.34 -- 6.06 3.4 37.43 489.39 

1.8 0.65 -- 7.44 7. 9 37.78 500.64 

3.3 1.2 .2.67 15.64 14.9 38.18 511.00 

2.2 0.86 -- 11.04 14.2 38.78 526.60 

2.1 0.84 -- 12.48 10.2 39.18 538.04 

1.()- 0.55 -- 9.72 4.9 39.58 551. 16 

2.3 1. 2 -- 12.34 13.7 40.38 573.56 

3.9 1.3 -- 11.60 22.3 40.78 583.20 
P-113 I Phosphate rock. calcareous, 

argillaceous FCA-150-47 0.35 Z1. 1 5.4 1.9 -- 15.00 zz. 7 41. 13 590.60 

P-llZ Phosphate rock FCA-151-47 0.8 Z7. 4 Z.3 0.78 -- 13.6Z 14.7 41.93 61Z.5Z 

P-111 Phosphate rock, argillaceous RAG- Z5-47 Z.6 zo. 1 5. 1 1. 8 -- 15.16 Z7. 3 44.53 664.78 

P-110 Mudstone RAG- Z6-47 1. 0 1. 9 -- -- -- -- 78.6 45.53 666.68 

P-109 Mudstone, phosphatic RAG- Z7-47 0.56 13.6 -- -- -- -- 39.6 46.09 674.Z8 

P-108 Mudstone, phosphatic RAG- ZS-47 1.55 13. 7 -- -- -- -- 47. 1 47.64 695.48 

P-107 Mudstone RAG- Z9·47 0.87 z. 8 -- -- -- -- 77.9 48.51 697. 9Z 

P-106 Mudstone RAG- 30-47 0.9Z 3.0 -- -- -- -- 78.8 49.43 700.68 

P-105 Mudstone RAG- 31-47 0.88 z. z -- -- -- -- 81. 1 50.31 70Z. 6Z 

P-104 Phosphate rock; fos. col. no. 47-HW-179 RAG- 3Z-47 0.55 Z9.4 -- -- -- -- 15.9 50.86 I 718. 8Z 

P-103 Mudstone, phosphatic, 

calcareous RAG- 33-47 0.87 14.Z -- -- 1~49 -- 36.Z 51.73 I 731. zo 

P-lOZ Mudstone, phosphatic, 

calcareous RAG- .34-47 o. 55 11.4 -- -- -- -- 44.3 5Z.Z8 737. 58 

P-101 Mudstone, phosphatic RAG- 35-47 1. 45 9.7 -- -- -- -- 54.6 53.73 751.68 

P-100 Phosphate rock, argillaceous RAG- 36-47 0.4Z 18.5 -- -- -- -- 35.3 54.15 759.43 

P- 99 Mudstone RAG- 37-47 1.1 7. 6 -- -- -- -- 63.4 55. Z5 767·. 79 

P- 98 Mudstone, phosphatic RAG- 38-47 0.37 11.6 -- -- -- -- 5Z.4 55.6Z 77Z.08 

P- 97 Mudstone; fos. col. no. 47-HW-178 RAG- 39-47 0.66 7. 5 -- -- -- -- 64.7 56.Z8 I 777.03 

P- 96 Phosphate rock, argillaceous; 01 fos. col. no. 47-HW-177 RAG- 40-47 1.9 17.4 35.9 58.18 

I C..:J -- -- -- -- 810.09 

P- 95 Mudstone, phosphatic, 

calcareous RAG- 41-47 1.75 15. 5 -- -- 1.55 -- 39.6 59.93 837. 19 

P- 94 I Mudstone, phosphatic, 

calcareous RAG- 4Z-47 0.91 lZ. 1 -- -- -- -- 46.7 60.84 848.19 

P- 931 Phosphate rock, calcareous RAG- 43-47 0.97 18. 1 -- -- -- -- 14.7 61.81 865. 74 

P- 9Z Phosphate rock, argillaceous RAG- 44-47 0.58 16.4 . s.z Z.6 -- 10.14 39.Z 6Z.39 875.25 

P- 91 Phosphate rock and phosphatic 

mudstone RAG- 45-47 0.96 31.6 1.7 0.68 -- 8.80 9.7 63.35 895.65 

P- 90 I Mudstone, phosphatic RAG- 46-47 0.48 8.4 11.6 3.6 -- 9.1Z 6Z.O 63.83 899.69 

P- 89 Phosphate rock, argillaceous RAG- 47-47 0.55 Z3.7 5.4 1.8 -- 10.56 ZZ.6 64.38 91Z. 74 

P- 88 Phosphate rock RAG- 48-47 1.75 31.6 1.8 0.74 -- 9.ZO s.z 66.13 967.99 

P- 87 Mudstone RAG- 49-47 o.sz 7. 0 11.3 3.6 -- 9.ZO 64.7 66.95 973.73 

P- 86 Phosphate rock RAG- 50-47 0.55 zs. 0 3.0 1.1 -- 10.38 13.8 67.50 989.13 

P- 85 Limestone, argillaceous RAG- 5Z-47 0.31 6.8 -- -- -- -- 39.7 67.81 991. Z4 

P- 84 Phosphate rock RAG- 53-47 Z.53 Z4.9 -- -- -- -- 18.7 70.34 1,054.Z4 

Limestone concretion in 

bed P-84 RAG- 54-47 (o. o-1. z) Z.4 -- -- -- -- 11.9 

P- 83 Phosphate rock, argillaceous RAG- 55-47 o. 51 Z0.5 -- -- -- -- Z9.4 70.85 1, 064. 69 

P- SZ Phosphate rock, argillaceous RAG- 56-47 1. 0 Z3.4 -- -- -- -- 23.1 71.85 1, 089. 09 

P- 81 Mudstone, calcareous RAG- 57-47 '0.64 3. 5 -- -- -- -- 39.3 72.49 1, 090.49 

P- 80 Phosphate rock RAG- 58-47 z.z Z7. 3 -- -- -- -- 14.Z 74.69 1, 150. 55 
01 

~+>-

Bed 

no. 

P- 79 

P- 78 

P- 77 

P- 76 

P- 75 

P- 74 

P- 73 

P- 72 

P- 71 

P- 70 

P- 69 

P- 68 

P- 67 

P- 66 

P- 65 

P- 64 

--

P- 63 

P- 62 

P- 61 

P- 60 

P- 59 

P- 58 

P- 57 

P- 56 

P- 55 

P- 54 

P- 53 

--

P- 52 

P- 51 

P- 50 

Rock description 

Limestone, argillaceous 

Phosphate rock, argillaceous, 

calcareous 

Mudstone, phosphatic 

Mudstone, phosphatic, 

calcareous 

Mudstone, calcareous, 

phosphatic 

Limestone 

Limestone, phosphatic, 

argillaceous 

Phosphate rock, calcareous 

Phosphate rock, calcareous 

Phosphate rock, calcareous 

Phosphate rock., argillaceous, 

calcareous 

Phosphate rock 

Phosphate rock 

Phosphate rock 

Phosphate rock, calcareous 

Limestone 

Limestone concretion in bed 

P-63 and lower part of 

bed P-64 

Phosphate rock, calcareous; 

fos. col. no. 47-HW-176 

Mudstone, calcareous, 

phosphatic 

Limestone 

Limestone 

Limestone 

Limestone 

Limestone, argillaceous 

Limestone 

Limestone 

Limestone, argillaceous 

Mudstone, calcareous 

Limestone concretion in 

bed P-53 

Mudstone 

Mudstone 

Mudstone 

Sample Thickness 

no. {feet) Pz05 

RAG- 59-47 1.55 4.8 

RAG- 60-47 2.23 17. 5 

RAG- 61-47 1.4 10.6 

RAG- 65-47 1.6 14.0 

RAG- 66-47 3.55 11.5 

RAG- 67-47 1. 17 1. 5 

RMC- ZZ-47 0.7 13.4 

RMC- 21-47 1. 7 19.3 

RMC- 20-47 0.5 22.4 

RMC- 19-47 1.1 22.7 

RMC- 18-47 0.3 zz.z 

RAG- 76-47 1.25 25.5 

RAG- 75-47 1. 95 32.2 

RAG- 74-47 1. 45 31.9 

RAG- 73-47 0.33 19. 1 

RAG- 72-47 0.85 2.9 

RAG- 71-47 {0. 0-3. 0) o. 3 

RAG- 70-47 2.66 zz.o 

RAG- 69-47 0.33 8. 6 

RAG- 68-47 1. 35 o. 9 

RMC- 16-47 0.6 o. 5 

RMC- 15-47 0.9 o. 7 

RMC- 14-47 1. 6 0.6 

RMC- 13-47 0.4 o. 5 

RMC- 12-47 0.6 0.4 

RMC- 11-47 1.8 0.4 

FCA-228-47 1. 1 o. 9 

FCA-227-47 0.75 z. 0 

FCA-226-47 {0. 0-1. 2) o. 2 

FCA-225-47 0.9 2.7 

FCA-224-47 1. 0 4.0 

FCA-223-47 0.9 8. 6 

Chemical analyses (percent Cumulative Thickness x 

Al2o3 Fe2o3 F Loss on Acid thickness percent P 20 

ignition insoluble {feet) {cumulativef 

-- -- 0.51 -- 20.5 76.24 1,158.49 

-- -- -- -- 33.0 78.47 1, 197.49 

-- -- -- - 56.6 79.87 1,212.33 

-- -- -- -- 39.3 81.47 1,234.73 

-- -- -- -- 37.8 85.02 1, 275. 63 

-- -- -- -- 4.8 86.19 1,277.38 

-- -- -- -- 30. 1 86.89 1, 286. 76 

4.1 1. 3 -- 18.92 15. z 88.59 1,319.57 

2.8 1. 25 -- 17.42 13.0 89.09 1, 330. 77 

4.1 1.5 -- 14.86 16. 7 90. 19 1, 355. 74 

4.3 1.83 -- 13.44 zz.o 90.49 1, 362. 40 

3.5 1.2 -- 14.40 13.8 91. 74 1,394.30 

0.9 0.36 -- 9.18 3. 5 93.69 1, 457.10 

1.0 0.37 -- 10.44 3.8 95.14 1, 503. 35 

2.4 1.07 -- 20.90 12. 5 95.47 1, 509. 71 

0.3 0.06 -- 42.38 1. 4 96.32 1, 512. 18 

1.3 0.41 -- 41.98 8. 6 -- -- 4.4 1. 4 -- 16.40 16. 7 98.98 1, 570. 68 

-- -- -- -- 4~. 8 99.31 1, 573. 52 

-- -- -- -- 15.7 100.66 1, 574. 74 

-- -- -- -- 14. 2 101. 26 1, 575. 04 

-- -- -- -- 8. 6 102.16 1, 575. 67 

-- -- -- -- 9.3 103.76 1, 576. 63 

-- -- -- -- 44.2 104.16 1, 576. 83 

-- -- -- -- 13.9 104.76 1, 577. 07 

-- -- -- -- 14.0 106.56 1,577.79 

-- -- -- -- 27.4 107.66 1, 578. 78 

-- -- -- -- 62.6 108.41 1, 580. 28 

-- -- -- -- 14.9 -- -- -- -- - -- 66.0 109.31 1, 582. 71 

-- -- -- -- 62.2 11 o. 31 1, 586. 71 

-- -- -- -- 50.0 111.21 1, 594. 45 
Limestone concretion in 

bed P-49 FCA-222-47 (o. o-o. 35} 0.9 -- -- -- -- 4.0 

P- 49 I Mudstone, calcareous, 

phosphatic FCA-221-47 1.2 7.8 -- -- -- -- 38.7 I 112.41 I 1,603.81 

Limestone concretion in 

bed P-48 FCA-220-47 (0. 0-0. 45} o. 8 -- -- -- -- 2.6 

P- 48 Mudstone, phosphatic, 

calcareous FCA-219-47 1. 4 8.8 -- -- -- -- 51. 3 113. 81 1, 616. 13 

P- 47 Limestone; fos. col. no. 47-HW-71 FCA-218-47 1. 4 2.4 -- -- -- -- 11.4 115. 21 1,619.09 

P- 46 Phosphate rock, calcareous, 

argillaceous FCA-158-47 1.3 15.6 -- -- -- -- 25.7 116. 51 1, 639. 37 

Limestone concretion in 

bed P-46 FCA-157-47 (0.0-1.0} 2. 3 -- -- -- -- 8. 7 

P- 451 Limestone, argillaceous, 

phosphatic FCA-156-47 0.9 9.6 -- -- -- -- 32.5 117.41 1, 648. 06 

P- 44 Mudstone, calcareous, 

phosphatic FCA-155-47 1.4 9. 7 -- -- -- -- 38.9 118. 81 1, 661. 64 

P- 43 I Phosphate rock, calcareous, 

argillaceous FCA-154-47 0.8 15. 1 -- -- -- -- 29.1 119. 61 1, 673. 72 

P- 421 Limestone, phosphatic, 

argillaceous FCA-153-47 o. 5 12.6 -- -- -- -- 23.2 120. 11 1, 680. 02 

P- 41 Phosphate rock and calcareous 

., mudstone FCA-152-47 o. 7 15. 1 -- -- -- -- 29.7 120.81 1, 690. 59 

~-~ P- 40 Limestone FCA- 63-47 o. 95 1. 3 -- -- -- -- 3.2 121.76 1, 691.83 

P- 39 Mudstone, phosphatic FCA- 62-47 0.85 10. 1 -- -- -- -- 45.5 122.61 1, 700. 43 

P- 38 Mudstone, phosphatic FCA- 61-47 0.6 11.0 -- -- -- -- 39.5 123. 21 1, 707. 03 

P- 371 Mudstone, phosphatic FCA- 60-47 0.45 10.5 -- -- -- -- 44.6 123.66 1, 711. 73 

P- 36 Mudstone, phosphatic FCA- 59-47 0.75 12.2 -- -- -- -- 32.0 124.41 1, 720. 88 

P- 35 Limestone, phosphatic, 

argillaceous FCA- 58-47 0.6 13.2 -- -- -- -- 27.3 125.01 1,728.80 

Limestone concretion in 

bed P-34 FCA- 57-47 (0. 0-0. 8} 1.4 I -- I 

--

I 

-- I --

I 

2. 7 

P- 34 I Limestone, phosphatic, 

argillaceous FCA- 56-47 0.9 11.0 -- -- -- -- 25.2 I 125. 91 I 1, 738. 70 

P- 331 Limestone, phosphatic, 

argillaceous FCA- 55-47 1.0 13.3 -- -- -- -- 28.1 126.91 1, 752. 00 

P- 32 I Limestone, phosphatic, 

argillaceous FCA-186-47 0.35 12.9 -- -- -- -- 30.3 127.26 1, 756.51 

P- 31 I Mudstone, phosphatic, 

calcareous FCA-185-47 0.65 11.9 -- -- -- -- 27.9 127.91 1, 764. 25 

P- 30 I Phosphate rock, calcareous FCA-184-47 1.0 17.4 -- -- -- -- 16. 1 128.91 1, 781. 65 

P- 29 Phosphate rock, calcareous FCA-183-47 0.8 17. 3 -- -- -- -- 11.7 129. 71 1, 795.49 

P- 281 Limestone, phosphatic FCA-182-47 0.95 16.3 -- -- -- -- 13.3 130.66 1,810.99 

P- 27 Mudstone, calcareous, 

phosphatic FCA-181-47 0.65 11.0 -- -- -- -- 32.7 131.31 1, 818. 14 

P- 26 I Phosphate rock FCA-180-47 0.6 24.2 -- -- -- -- 17.4 131.91 1,832.66 
01 

0':1 

Bed 

no. 

'P- 25 

P- 24 

P- 23 

P- 22 

P- 21 

P- 20 

P- 19 

P- 18 

P- 17 

P- 16 

--

P- 15 

P- 14 

P- 13 

P- 12 

P- 11 

P- 10 

P- 9 

P- 8 

--

P- 7 

P- 6 

P- 5 

P- 4 

P- 3 

P- 2 

P- 1 

P- 12 

Sample Thickness Chemical analyses (percent Cumulative Thickness x 

Rock description 'no. {feet) P205 Al2o3 Fe2o3 F Loss on Acid thickness percent P 20 

ignition insoluble {feet) { cumulati vef 

Limestone FCA-179-47 0.35 3.4 -- -- -- -- 10.2 132.26 1, 833. 85 

Phosphate rock, argillaceous FCA-178-47 0.45 14.7 -- -- -- -- 30.9 132.71 1,840.46 

Limestone, argillaceous FCA-177-47 1.7 3. 8 -- -- -- -- 17.5 134.41 1, 846. 92 

Mudstone, phosphatic FCA-172-47 2.6 9.6 -- -- -- -- 49.1 137.01 1, 871. 88 

Mudstone, calcareous FCA-171-47 0.8 6.8 -- -- 0.63 -- 58.5 137.81 1, 877.32 

Mudstone, phosphatic FCA-170-47 1. 0 8. 7 -- -- -- -- 46.5 138.81 l, 886.02 

At the north trench {lot no. 1 207) the strata at the base of the phosphatic shale are in fault contact with the underlying Wells formation. 

The strata at the south trenches {lot no. 123b) were measured and sampled to complete the information on this interval. Correlation 

between the trenches was based on a nodular zone below samples 3053-RPS and FCA-169-47. · 

Lot no. 1236 

Limestone, argillaceous 3053- RPS 2.7 2. 8 -- --- -- -- 24.7 141.51 1, 893. 58 

Phosphate rock and mudstone 3052- RPS 3.2 23.6 3. 1 1.20 -- 10. 18 26.0 144.71 1, 969. 10 

Phosphate rock and mudstone 3051-RPS 1. 1 24.3 3.7 1.35 -- 8.30 25.7 145. 81 1, 995. 83 

Limestone, argillaceous 2859-RPS 0.75 7. 6 2.9 1. 04 -- 25.42 26. 7 146.56 2,001.53 

Limestone lens in bed P-15 -- (0. 0-1. 2) -- -- -- -- -- -- -- -- Phosphate rock and mudstone 2858- RPS 3.6 20.8 4.1 1. 46 -- 9.08 32.4 150. 16 2, 076. 41 

Phosphate rock 2857-RPS 2.2 27.7 2.3 0.95 -- 9.12 16.6 152. 36 2,137. 35 

Phosphate rock, argillaceous, ' I I 

calcareous 2856- RPS 2.4 17.2 3.4 1. 26 -- 14.20 29.5 154.76 2, 178.63 

Phosphate rock, argillaceous 2855- RPS 2. 1 24.2 3.5 1. 20 --. 8.68 24.9 156.86 2, 249.45 

Limestone 2854-RPS 1.7 2.4 1. 8 0.41 -- 37.22 11.4 158.65 2, 233. 53 

Phosphate rock, argillaceous, 

calcareous 2853- RPS 1. 3 20.0 3.2 1. 03 -- 10.94 27.4 159.86 2, 259. 53 

Phosphate rock, argillaceous, 

calcareous 2852-RPS 0.8 18.8 -- -- -- -- 27.4 160.66 2, 274. 57 

Phosphate rock, calcareous, 

argillaceous 2851-RPS 0.7 17. 3 -- -- -- -- 28.1 161.36 2, 286. 68 

Limestone lens, argillaceous in 

bed P-7 2850-RPS (0.0-1.5) -- -- -- -- -- -- -- -- Limestone 1106-RAG 1. 8 5. 1 -- -- -- -- 8. 4 163.16 2, 295. 86 

Phosphate rock 1105-RAG 3.4 31.4 1.1 o. 51 3.41 8.54 5. 6 166.56 2, 402. 62 

Phosphate rock 1104-RAG 2.4 32.6 0.58 0.48 3.57 7.70 2.6 168.96 2,480.86 

Mudstone, calcareous 1103-RAG 0.6 2. 7 -- -- -- -- 52.8 169.56 2,482.48 

Limestone, argillaceous 1102-RAG 2.6 4.2 -- -- -- -- 33.5 172.16 2,493.40 

Mudstone, calcareous 1101-RAG 1. 2 3.6 _;.. -- --- -- 40.9 173.36 2,497. 72 

Phosphate rock 1100-RAG 0.4 33.6 -- -- 3.57 -- 6. 1 173.76 2, 511. 16 

Lot no. 1207 

Limestone, argillaceous; fos. col. no. 47-HW-64 FCA-169-47 (2. 2) 1. z -- -- -- -- 22.0 -- --
01 

-...:] 

FCA-169-47 is equivalent to 3053-RPS of lot no. 1236. 

P- 11 I Phosphate rock FCA-168-47 (1. 4) 27.0 -- -- Mudstone concretion in bed 

P-10 FCA-167-47 {0. 0-0. 4) 5. 7 -- -- P- 10 I Phosphate rock, argillaceous FCA-166-47 (1.05) 24.1 -- -- P- 9 Phosphate rock RAH-176-47 (0.9} 27. 1 -- -- P- 8 Limestone, phosphatic; fos. 

col. no. 47-HW-63 RAH-175-47 (o. 7) 8. 7 -- -- P- 7 I Phosphate rock, argillaceous RAH-174-47 {1. 0} 25.3 -- -- Limestone concretion in bed P-7 RAH-173-47 (0. 0-0.,7) 3. 3 -- -- P- 61 Phosphate rock, argillaceous RAH-172-47 (0. 6) 22.7 -- -- P- 5 Mudstone, calcareous RAH-171-47 ~o. 35) 0.7 -- -- P- 4 Limestone, argillaceous FCA-173-47 1. 0) o. 2 -- --

P- 31 Limestone FCA-174-47 (0. 15) 3. 7 -- -- P- 2 Phosphate rock FCA-175-47 (o. 25) 32.3 -- -- P- 1 Limestone, phosphatic RAG- 77-47 (0. 5) 9.0 -- -- RAG-77-47 lies in fault contact with FCA-176-47 at the top of the Wells formation. 

Wells formation-top beds only 

Cw-1 Limestone; fos. col. no. 47-HW-62 FCA-176-47 3. 1 2. 6 -- -- Cw- 2 Limestone -- 3.0 -- -- -- Cw- 3 Chert -- 1.0 -- -- -- Cw- 4 Quartzite -- 2.4 -- -- -- Cw- 5 Quartzite, chert, and limestone -- 3. 1 -- -- --

Cw- 6 Quartzite -- 3.0 -- -- -- Cw- 7 Quartzite -- 9.0 -- -- -- Cw- 8 Quartzite -- 11.55 -- -- -- Cw- 9 Quartzite, limestone, and chert -- 3.65 -- -- -- Cw-10 Quartzite and limestone -- 10.0 -- -- --

Cw-11 Quartzite and limestone -- 9.3 -- -- -- Cw-1~ Quartzite and chert -- 6.48 -- -- Cw-13 Quartzite, calcareous -- 11.5 -- -- -- Cw-14 Sandstone and mudstone -- 0.82 -- -- --

-- -- 19.2 

0.49 -- 65.9 

-- -- 21. 7 

2.70 -- 14.4 

3.58 -- 8.3 

-- -- 21.0 

-- -- 4. 1 

-- -- 23.7 

-- -- 50.4 

-- -- 35.7 

2.48 -- 19.4 

-- -- 5.-5 

-- -- 13.4 

-- -- 5. 0 3. 1 8.06 

-- -- -- 6. 1 -- -- -- -- 7. 1 -- -- -- -- 9.5 -- -- --- -- 12.6 --

-- -- -- 15.6 -- -- -- -- 24.6 -- -- -- -- 36. 15 -- -- -- -- 39.80 -- -- -- -- 49.80 --

-- -- -- 59.10 -- -- -- -- 65.58 -- -- -- -- 77.08 -- -- -- -- 77.90 --
U1 

(X) 

SPECTROGRAPHIC ANALYSES-MONTPELIER CANYON~ IDAHO. LOT NO. 1207. 

Semi-quantitative analyses of two samples of phosphatic shale member of Phosphoria formation., Montpelier Canyon~ Idaho (see 

immediately preceding pages for location of section, thickn~ss and description of strata, and chemical analyses of samples}~ made by 

U. S. Bureau of Mines Laboratory~ Albany, Oregon. In addition to the elements listed in the table below. Sb., As., Be, Bi, Cd, Co, Cb, 

Ga, Au, Li, Hg, Pt, Ta., Sn, W, and Zn were looked for but were not detected. 

Bed Sample no. Al Ba no. 

P-132 FCA-113-47 D E 

P-131 FCA-112-47 D E 

- ------- -·-----·-- -

Explanation of symbols 

A = more than 1 0 percent 

B = 5-10 percent 

C = 1-Spercent 

D = 0.1-1 percent 

B Ca Cr Cu Fe 

F A E G D 

F A E G D 

Pb 

E 

ND 

E = 0.01-0.1 percent 

F = 0.001-0.01 percent 

G = less than 0. 001 percent 

ND = not detected 

Mg Mn Mo Ni Si 

D F F F c 

D F ND F c 

Ag Na Sr Ti v Zr 

G E E E D F 

G E E E D F 

INT.-DUP. SEC .. •ASH n f' •• n.,. .. a.