GEOLOGICAL SURVEY CIRCULAR 375

STRATIGRAPHIC SECTIONS 

OF THE PHOSPHORIA 

FORMATION 

1953

The part of this report dealing with 

Idaho and Utah is based on work done 

on behalf of the U. S. Atomic Energy 

Commission; that dealing with Montana 

was prepared as part of the program 

of the Department of the Interior for 

development of the Missouri River 

basin and on behalf of the U. S. 

Atomic Energy Commission. The report 

is published with the permission of 

the Commission.

.UNITED STATES DEPARTMENT OF THE INTERIOR 

Douglas McKay, Secretary

GEOLOGICAL SURVEY 

Thomas B. Nolan, Director

GEOLOGICAL SURVEY CIRCULAR 375

STRATIGRAPHIC SECTIONS OF THE PHOSPHORIA FORMATION, 1953

By R. W. Swanson, L. D. Carswell, R. P. Sheldon, 

and T. M. Cheney

The part of this report dealing with 

Idaho and Utah is based on work done 

on behalf of the U. S. Atomic Energy 

Commission; that dealing with Montana 

was prepared as part of the program 

of the Department of the Interior for 

development of the Missouri River 

basin and on behalf of the U. S. 

Atomic Energy Commission. The report 

is published with the permission of 

the Commission.

Washington, D. C., 1956

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

Outcrop of Phosphoria formation 

dotted where questionable

oUOO

Location and lot number of sample 

locality included in this report

01252

Location ond lot number of sample 

locality included In other reports

Recompiled and modified 

from Clobough, 1946

Figure 1. Outcrops of the Phosphoria formation in Montana and localities sampled.
STRATIGRAPHIC SECTIONS OF THE PHOSPHORIA FORMATION, 1953

By R. W. Swanson, L. D. Carswell, R. P. Sheldon. and T. M. Cheney

Lot no.

Introduction...................... .

Acknowledgments................. .

Stratigraphy of the Phosphoria formation in Montana.............. .

Stratigraphy of the Phosphoria formation in Idaho and northern Utah... .

Stratigraphic sections............. .

References....................... .

Tables of Stratigraphic sections

Trout Creek, Montana........ .

Garrison Warm Springs Creek..

Newman Brothers, Elliston.....

Senecal incline................

East Elliston................ .

Edgar mine east adit........ . .

Douglas Creek No. 3 North 

mine..................... .

1400

1402

1398

1401

1397

1389

1388

CONTENTS

Page

1

1

10

11

12

13

14

Lot no. Page

Tables of Stratigraphic 

sections Continued

Gird Creek west limb ..........

Gird Creek east limb...........

Dissett mine...................

White Gulch....................

Wheatland School...............

Mount Humbug..................

Logan.........................

Cave Creek ....................

Little Long Valley, Idaho........

East Georgetown Canyon.........

Clear Creek....................

Phosphoria Gulch...............

South Crawford Mountains, Utah. 

Sugar Pine Creek...............

1387

1399

1386

1403

1384

1404

1367

1257

1391

1392 

1267a

1393

1395

1394

ILLUSTRATIONS

15

16

17

18

20

21

22

22

23

25

26

28

29

30

Page

Figure 1. Outcrops of the Phosphoria formation in Montana and localities sampled......................... iv

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

3. Outcrops of the Phosphoria and Park City formations in Utah and localities sampled.............. 3

4. Generalized section of Phosphoria formation at Sheep Creek, Montana (lot 1234)................. 4

5. Generalized section of Phosphoria formation at Trail Canyon, Idaho (lot 1206)................... 5

INTRODUCTION

Since 1947, the U. S. Geological Survey has measured and sampled phosphatic parts of the Phosphoria 

formation of Permian age and its partial Stratigraphic 

correlatives at many localities in Montana, Idaho, Wyoming, and Utah. Preliminary data on the thickness of 

the beds and their composition at localities sampled 

before 1952 have been published in U. S. Geological 

Survey Circulars 208-211; 260; 262; 301-307; and 

324-327. This report presents similar data on the 

localities sampled in 1953-54 (figs. 1, 2, and 3). 

The field and laboratory procedures adopted in these 

investigations are described in a previous report 

(McKelvey and others, 1953a).

Many people have taken part in this investigation. 

E. T. Ruppel, G. Abele, R. Hughes, J. A. Peterson, 

and Z. S. Altschuler participated in the description of 

the strata and the collection of samples referred to in 

this report. The laboratory preparation of samples 

for chemical analysis was done in Denver, Colo., 

under the direction of L. F. Rader, Jr. The

Pa05 and acid-insoluble analyses were made for the 

Survey by the U. S. Bureau of Mines at the Northwest 

Electrodevelopment laboratory, Albany, Oreg., under 

the direction of S. M. Shelton and M. L. Wright. The 

AlaOs, Fe2 0 3, and loss-on-ignition analyses were 

made in the laboratory of the Geological Survey in 

Washington, D. C., under the direction of Irving May, 

by chemists I. Barlow, B. Ingram, R. Smith, and 

W. Tucker.

ACKNOWLEDGMENTS

Special thanks are due V. E. McKelvey and 

A. E. Weissenborn, who gave much advice and help !n 

carrying out the field program. The cost of the field 

and laboratory investigations has been borne in part 

by the Department of the Interior program for development of the Missouri River basin and in part by the 

Atomic Energy Commission. It is a pleasure to acknowledge the fine cooperation extended to the field 

parties by the local residents, property owners, and 

operating phosphate companies who furnished information and services and gave access to property.
Outcrop of Phosphoria formation, 

dotied where questionable

Location and lot number of sample 

locality included in this report

Location and lot number of sample 

locality included in other reports

Figure 2. Outcrops of the Phosphoria formation in Idaho and localities sampled.
"2° IDAHO 

EXPLANATION

Outcrop of Phosphoric form

dotted where questio

o 1394

Location and lot number 

locality included In this 

o 1290

Location and lot number af 

locality included in other 

UT

110°

20 30 __40 MILES

Figure 3. Outcrops of the Phosphoria and Park City formations in Utah and localitie
30

PCRCCNT

20 10

THHMNC>9

i« «er

Z B

PERCENT DESCRIPTION

FEET Dinwoody formation 

Muds tone: calcareous, soft, pale-yellow, thin-bedded

PHOSPHORIA FORMATION

Member E 

Sandstone: hard, pale, yellowish-orange, thick-bedded

Chert: hard, light-gray, thick-bedded chert interbedded with medium-hard, pale 

yellowish-orange, thick-bedded chert

Sandstone and chert: medium-hard, light-gray, thick-bedded sandstone containing 

some interbeds of hard, light-gray chert

31 Sandstone and chert: medium-hard, brownish-gray, thick-bedded sandstone 

interbedded with hard, light-gray, thick-bedded chert

14 Sandstone: medium-hard, yellowish-brown, thick-bedded sandstone interbedded 

with hard, brownish-gray sandstone

Chert: medium-hard, dusky yellowish-orange, to medium-brown, thick-bedded

Mudatone: medium-hard, light-gray to yellowish-brown, thick-bedded

Sandatone: hard, light-gray to yellowish-brown, thick-bedded; lowermost 0.73 

foot phosphatic

19 12

Member D 

Mud stone: phosphatic, soft, brownish-black, thin-bedded

15 Mud stone: soft, brownish-black to black, fiasile

25 Phosphate rock: oolitic, soft, dark-brown, thin-bedded

22 14 Phosphate rock and mudatone: oolitic, medium-hard, brownish-gray, phosphate 

rock, interbedded with medium-hard, brownish-gray mudstone

12

Member C 

Sandstone: soft, dusky yellowish-orange, thick-bedded

41 Sandstone and chert: medium-hard, light brownish-gray, masaive sandstone 

interbedded with hard, yellowish-gray, massive chert

45 Dolomite: sandy, medium-hard, medium- to light-gray; contains lenses and 

nodules of chert

Sandstone: soft, dusky yellow, thin-bedded; contains many lenaes and nodules 

of chert

35 Chert: hard, medium-gray to yellowish-brown, thick-bedded; contains some 

interbeds of mudstone and sandstone

Member B

Mudstone: medium-hard, medium yellowish-brown, thin-bedded; contains several 

small lenses of oolitic phosphate rock

14 Phosphate rock and mudstone: soft, brownish-gray, oolitic phosphate rock 

interbedded with soft, pale yellowish-brown mudstone

20 Mudstone: medium-hard, medium yellowish-brown, thin-bedded

Member A 

Mudstone: dolomitic, soft, light-gray, chin-bedded

10

Dolomite: medium-hard, pale yellowish-orange, thin-bedded; contains some 

interbedded cherry mudstone

Quadrant formation 

Sandstone: medium-hard, light-gray, thin-bedded

Figure 4. -Generalized section of Phosphoria formation at Sheep Creek, Montana (lot 1234).
3 

0 

FEET

50

too

160 

200 

260 

300 

360 

400

P

10

m

MftCIHT

20

1:

10

i

1

tt

i

i

i

i

m

0 LITHOLCay

I

i

i«

sssgH

i

tt

1

1w

i

PC

ll

I

n

%

*^<

^

^^

THICK- AVIftMl OMWIPTIOH MCSS '2 ^B" 

IN FEET PCMCMIT Phosphoria formation

L- T" T^

r^yf i

r x if

'***

Jf JT

L. | 1 1 _ LJL

_.JL

-JC JT f

*=s*=?

_ ^ JC

'V* Tf

IL.

T

t

 . _

 \ \

 \ \

±£^E

_L_ -iZT^

L_r~Z_TTLI

 

F

J.

^

/

*/

/

^X^

/

y

/

A

=,// /

-*-. * .-*( / /

 -

- 

ErEr-EI:

^^

i i i

- i

j^-i-1-;

ii^zi^~x:

t I {,

 '- I'-t'

*. t _ i

\ \ 

* * 1 t ^

 _

m

r-1-

U

^

i

/

, nj

/ 

/

/// ''/.', '//,

y

46

32

68

82

1

11 

11

22

29

3

5

5

16

2

15

18

4

20

2

14

3

2

4

15

7

4

2

1

0

1

1

19

2 

22

14

6

13

2

12

3

14

4

9

1

6

3

17

5

11

4

25

33

2

31

Upper shale member (aot exposed)

Rex chert member (top rot exposed) 

Chert: hard, black, thin-bedded

Mudstone: hard, black, thin-bedded

Chert: hard, brittle, dark-gray to pinkish-gray, thick-bedded

Chert and limestone: 60 percent hard, black, thin-bedded chert; 20 percent hard, 

dark-gray, massive limestone

Phospbatic shale member

Phosphate rock: oolitic, nodular, medium-hard, light brownish-gray; contains 

omphalotrochue gastropods

Mudstone: medium-hard, brownish-gray, thin-bedded

Phosphnte rock: argillaceous, oolitic, pisalitic, medium-hard, brownish-gray to 

blnck, thin-bedded; contains a few limestone concretions

Mudstone and phosphate rock: soft, brownish-black, thin-bedded mudstone, interbedded with oolitic, soft, brownish-black, thin-bedded phosphate rock; containa many limestone lenses near base

Mudstone: medium-hard, brownish-gray, thin-bedded; 2-foot limestone bed nt top; 

contains phosphntic nodules in middle 12 feet

Mudstone: phosphatic, oolitic, bard, grayish-brown, thin-bedded

Mudstone; bnrd, brownish-gray, thick-bedded

Mudstone: phosphatic, oolitic, medium-hard, brownish-gray, thin-bedded

Mudstone: nodular, bard, brownish-gray, thick-bedded; yellow-brown stain on 

joints

Mudstone: phosphntic, nodular, oolitic, medium-hard, brownish-gray to blrck, 

thin-bedded

Mudstone: nodular, hard, brownish-gray, thick-bedded

Mudstone: phosphntic, oolitic, soft, brownish-black to black, thin-bedded; contains many limestone leases

Limestone: hard, medium-gray, massive; contains black chert layers at base

Mudstone: soft, brownish-black, thin-bedded mudstone interbedded with phosphatic, oolitic, soft, brownish-black, thin-bedded mudstone

Limestone: hard, pale-brown massive

Mudstone: phosphatic, oolitic, soft, brownish-black, thin-bedded; contains a 

few limestone lenses

Limestone: hard, pale-brown massive

Mudstone: phosphatic, oolitic, nodular, soft, brownish-black, thin-bedded

Limestone: hard, brownish-gray, massive. 'False cap" limestoae

Phosphate rock: argillaceous oolitic, soft, brownish-gray to brownish-black, 

fissile

Phosphate rock: oolitic, medium-hard, brownish-black, thin-bedded

Mudstone: medium-hard, dark-brown, thin-bedded

Phosphate rock: oolitic, hard, black, thin-bedded. Lower 0.5 foot contains whitr 

(tabular) fossil fragments

Wells formation

Figure 5. Generalized section of Phosphoria formation at Trail Canyon, Idaho (lot 1206).
STRATIGRAPHY OF THE PHOSPHORLA FORMATION 

IN MONTANA

In southwestern Montana the Phosphoria formation 

has been divided into five members: two phosphatic 

shale members, provisionally termed the B and D members, and three hard members, provisionally termed 

the A, Cj and E members (fig. 4). The lower two 

hard members, A and C, are dominated by limestone 

and the top, E member, by chert and sandstone or 

quartzite. Most of the members can be identified over 

a large part of the area of outcrop, though member correlation toward the northeast is more difficult. The 

formation ranges in thickness from less than 100 to 

more than 800 feet.

The A member is most complete toward the west 

and southwest and consists of limestone or dolomite, 

sandstone, mudstone, and chert. It has a maximum 

thickness of nearly 350 feet, overlies the Quadrant 

formation of Pennsylvanian age, and probably is partly 

equivalent to the upper part of the Wells formation of 

southeastern Idaho and adjacent Wyoming and Utah 

(McKelvey, 1949).

Near the southwest corner of the state the lower 

phosphatic shale or "B member, is 25-50 feet thick; it 

thins markedly to the north and east and pinches out 

a few miles north of Dillon. In the Centennial Mountains this member contains a rich bed of minable phosphate.

The C member consists of 40-200 feet of limestone, 

chert, and sandstone. The upper phosphatic shale or 

D member is similar to and much more uniform and 

widespread than the B member, though it contains 

minable phosphate only toward the north end of the area 

where in places the full thickness of the phosphatic 

zone consists of a single 3- to 5-foot bed of high-grade 

phosphate rock.

The E_ member is the most widespread and uniform; it averages about 100 feet in thickness and consists 

chiefly of siliceous rocks quartzitic sandstone, chert, 

and siltstone. In the greater part of the area it is overlain by the Dinwoody formation of Triassic age, but toward the north and northeast it is unconformably overlain by the Ellis group of Jurassic age,

STRATIGRAPHY OF THE PHOSPHORLA FORMATION 

IN IDAHO AND NORTHERN UTAH

At its type locality in southeastern Idaho (Richards 

and Mansfield, 1912), the Phosphoria formation consists 

of a lower member, the phosphatic shale, about 180 feet 

thick and an upper member, the Rex chert, about 240 feet 

thick (fig. 5). The upper 80 feet of the Rex consists of 

cherty mudstone and black shale (McKelvey, 1949); although it varies in thickness it is recognizable over most 

of southeastern Idaho and westernmost Wyoming. The 

phosphatic shale member thins progressively northward 

to a thickness of about 60 feet in the Caribou Range 

(lots 1338 and 1353).

The stratigraphy of the Phosphoria formation in 

the Crawford Mountains at the northeastern corner of 

Utah, near the Idaho-Wyoming corner (Smith and 

others, 1953), is similar to that in the adjacent states. 

It consists of the phosphatic shale member, about 

210 feet thick, and the Rex chert member, about

220 feet thick. The upper shale member, present in the 

adjacent region to the north, is not well defined in this 

area. Farther south in Utah the middle shale member 

of the Park City formation probably is equivalent in major 

part to the phosphatic shale member of the Phosphoria 

formation in Idaho, and the upper limestone member is 

probably equivalent to the Rex chert member of the 

Phosphoria formation to the north (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 the studies have been focused. 

It consists of many thin layers, some of which persist 

over the whole area, including northern Utah and westernmost Wyoming. They may be grouped into several 

broad units, as shown in figure 5.

In southeastern Idaho and northern Utah, the 

Phosphoria formation overlies the Wells formation of 

Pennsylvanian age, the upper part of which consists 

chiefly of cherty gray fossiliferous limestone that contains some thin phosphatic layers and may be the partial' 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). The Phosphoria is overlain in this 

region by the Din woody formation of Triassic age, consisting of limestone, calcareous siltstone, and sandstone.

More detailed correlations of the strata within 

individual states as well as over the entire area of the 

western phosphate field will be discussed in subsequent 

publications.

STRATIGRAPHIC SECTIONS

Analytical data and abstracts of stratigraphic 

sections measured at 18 localities plus additional information at three previously reported localities follow. 

Their locations as well as the locations of sections 

previously reported in these states are shown in figures 1, 2, and 3.

REFERENCES

Cheney, T. M., Sheldori, R. P., Waring, R. G., and 

Warner, M. A., 1953, Stratigraphic sections of the 

Phosphoria formation in Wyoming, 1951: U. 3. 

Geol. Survey Circ. 324.

Cheney, T. M., Smart, R. A., Waring, R. G., and 

Warner, M. A., 1953, Stratigraphic sections of the 

Phosphoria formation in Utah, 1949-51: U. S. Geol. 

Survey Circ. 306.

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

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

Survey, Mineral Inv. Prelim. Map 3-198.

Cressman, E. R., Wilson, W. H., Tandy, C. W., 

and Garmoe, W. J., 1953, Stratigraphic sections 

of the Phosphoria formation in Montana, 1949-50, 

part 1: U. S. Geol. Survey Circ. 302.

Davidson, D. F., Smart, R. A., Peirce, H. W., and 

Weiser, J. D., 1953, Stratigraphic sections of the 

Phosphoria formation in Idaho, 1949, part 2: U. S. 

Geol. Survey Circ. 305.

KLepper, M. R., Honkala, F. S., Payne, O. A., and 

Ruppel, E. T., 1953, Stratigraphic sections of the 

Phosphoria formation in Montana, 1948: U. S. Geol. 

Survey Circ. 260.
McKelvey, V. E., 1949, Geological studies of the 

western phosphate field: Am. Inst. Min. Metall. Eng. 

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

McKelvey, V. E., Armstrong, F. C., Gulbrandsen, 

R. A., and Campbell, R. M., 1953c, Stratigraphic 

sections of the Phosphoria formation in Idaho, 1947- 

48, part 2: U. S. Geol. Survey Circ. 301.

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

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

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

U. S. Geol. Survey Circ. 208.

McKelvey, V. E., Smith, L. E., Hoppin, R. A., and 

Armstrong, F. C., 1953b, Stratigraphic sections of 

the Phosphoria formation in Wyoming, 1947-48: 

U. S. Geol. Survey Circ. 210.

Mertie, J. B., Jr., Fischer, R. P., and Hobbs, S. W., 

1951 [1952], Geology of the Canyon Ferry quadrangle, 

Montana: U. S. Geol. Survey Bull. 972.

O'Malley, F. W., Davidson, D. F., Hoppin, R. A., 

and Sheldon, R. P., 1953, Stratigraphic sections of 

the Phosphoria formation in Idaho, 1947-48, part 3: 

U. S. Geol. Survey Circ. 262.

Peterson, J. A., Gosman, R. F., and Swanson, R. W., 

1954, Stratigraphic sections of the Phosphoria formation in Montana, 1951: U. S. Geol. Survey Circ. 326.

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.

Sheldon, R. P., Cressman, E. R., Carswell, L. D., 

and Smart, R. A., 1954, Stratigraphic sections of 

the Phosphoria formation in Wyoming, 1952: U. S. 

Geol. Survey Circ. 325.

Sheldon, R. P., Waring, R. G., Warner, M. A., and 

Smart, R. A., 1953, Stratigraphic sections of the 

Phosphoria formation in Wyoming, 1949-50: U. £. 

Geol. Survey Circ. 307.

Sheldon, R. P., Warner, M. A., Thompson, M. E., 

and Peirce, H. W., 1953, Stratigraphic sections of 

the Phosphoria formation in Idaho, 1949, part 1: 

U. S. Geol. Survey Circ. 304.

Smart, R. A., Waring, R. G., Cheney, T. M., and 

Sheldon, R. P., 1954, Stratigraphic sections of the 

Phosphoria formation in Idaho, 1950-51: U. S. 

Geol. Survey Circ. 327.

Smith, L. E., Hosford, G. F., Sears, R. S., Sprouse, 

D. P., and Stewart, M. D., 1953, Stratigraphic sections of the Phosphoria formation in Utah, 1947-48: 

U. S. Geol. Survey Circ. 211.

Swanson, R. W., Cressman, E. R., Jones, R. S., and 

Replogle, B. K., 1953b, Stratigraphic sections of the 

Phosphoria formation in Montana, 1949-50, part 2: 

U. S. Geol. Survey Circ. 303.

Swanson, R. W., Lowell, W. R., Cressman, E. R., 

and Bostwick, D. A., 1953a, Stratigraphic sections 

of the Phosphoria formation in Montana, 1947-48: 

U. S. Geol. Survey Circ. 209.
Troat Creek, Mont., lot 1400

Part of Phosphoria formation measured and sampled 90 feet from surface at breast of small adit opened 

northwest of Trout Creek in SW-^SW^ sec. 35, T. 10 N., R. 7 W., Powell County, Mont., by R. W. Sw

N. 45° W. and dip 45° NE. on the northeast flank of the Elliston anticline. Samples analyzed by 

Albany, Oreg.

Bed

no.

Rock description

Sample

no.

Thickness 

(feet)

Chemical analyses 

(percent)

PaOs

Acid 

insoluble

E member of Phosphoria formation basal bed only

E-l 0.2

D member of Phosphoria formation

D-5 

J_^ D-4«-}-

D-3

D-2

D-l Sandstone, phosphatic 

7508-RWS

r7CAp7 "Dl.FQ

7506 -RWS

7505 -RWS

7504 -RWS

0.7

.7 

2.0

2.5

1.1

7.10

14.4

24.5

-,£ o

9.55

f-r- r* 65.7

eft 9

36.0

6.5

72.7

C member of Phosphoria formation upper part only

C-4

C

-z

-J

C O

P 1

2.4

1.0

.5
Garrison Warm Springs Creek, Mont., lot 1402

Most of Phosphoria formation measured and sampled from natural exposures on northwest side of valley 

Creek in SE£lW£ sec. 19, T. 10 N., R. 9 W., Powell County, Mont., by R. W. Swanson in July 195^

and dip 65° SW. on southwest flank of Garrison anticline. Samples analyzed by U. S. Bureau of 

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses 

(percent)

P20 5

Acid 

insoluble

E member of Phosphoria formation top not exposed

E-3 

E-2

E

T

23.0 

3.5 

1.6

D member of Phosphoria formation

D-9 

D-8

D-7

D-6 

D-5 

D-4

D-5

D-2

D-l

Quartzite, phosphatic, and quartzitic

Phosphate rock, contains fluorite 

Phosphate rock, siliceous, contains fluoritePhosphate rock, sandy, and phosphatic

TCOO TD1 TQ

1-7 r- f~\~t T"JT ro

7519 -RWS

7518 -RWS 

7517 -RWS 

7516 -RWS

7515-RWS 

7514 -RWS

Tcon "DT.rQ

1.1

2.4

__

« (5 

.75 

.25 

1.3

Qr- 

.05

.4

1.1

5.50 

10.6

28.1

30.4 

23.2 

29.5

31.5

22.4

6.90

Q~z r\

69.0

24.0

14.0

28.7 

19.0

12.7 

34.4

_P_ _

ID' I

C member of Phosphoria formation

C-3 

C-2 

C-l ^i 1 1-d't-nn^ _ ___ __ _ _ 

2.9 

26.0 

1.0

Quadrant formation upper part only

80.0
Newman Brothers, Elliston, Mont., lot 1398

Part of Phosphoria formation measured and sampled in bulldozer trench dug by Newman Brothers of Ellis

R. 7 W., Powell County, Mont., by R. W. Swanson in June 1954, Beds strike north and dip 20° W. 

at southwest corner of Elliston anticline. Samples analyzed by U. S. Bureau of Mines laborator

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses 

(percent)

P20 5

Acid 

insoluble

E member of Phosphoria formation lower part only

E n

T? 8

E

"7

IT ^

E C

F 4

E

_ -z.

2

E o

E

n

Chert- - - --- _ - _-

nh(^T>t - _ _ __ _ - - _ -- - - --

Chert

Chert --- - - -___ - -_ _-

Steep fault, beds not correlated across. 

Chert - ______

PViOT»4- ___

Chert 

7490 -RWS

7489 -RWS

4.0

T Q

4

.4

.7

1.2

1 2

2

r~

 5

.6

4.40

2.70

Qi- -i

Qr-7 C.

D member of Phosphoria formation

D-14

D-13 

D-12

D-ll

D-10

D- 9

n- 8

D- 7

D 6

D- R

3 

D 4

D

-z.

J

D- 2

D- 1

Mi ifS Q 4~ ono r*Vi*s Y*"!"^^ QnH r*Q Y*Vi ATIQ "ho Y*r^r*l^-_-» ->

^n 1 hal-rnno.- -. -. -- ^ _ _._.__

TDVi PI^T^VIQ "l~o Y*r^r*l^" » _ ._ __.-._.-.-. _

P>ici-y»-|-_ ________ _, _ _-_._. ___ __ ____

Chert and mudstone 

7488-RWS

7487-RWS

7h.Ptf~t RU^

7485-RWS

7484 -RWS

748>RWS

7482 -RWS

748lTRWS

vliRn RU^

vlivn Rt.rct

YliVfi -RW^

7477-RWS

7476 -RWS

Thrrr: "DT.rQ

1.0

.55

.5

.6

2

rr

 y 

.6

1.3

2.1

.6

.4

1.0

.6

.3

3.65

12.0

1.30

1.60

12.8

17.7

21.2

~*f\ n

24.4

7-95

1

r\r\

2.45

2.90

27-4

c« 7

65.4

Qn -z. 01.3

12.9

65.1

li i- Q

12.7

9.27

36.6

70.2

63.0

ryQ f-\

Di- i85.5

r\(~\ r~

29.5

C member of Phosphoria formation upper part only

\j- -j 

C- 4

P "Z

p o

p i PVlfa-r»-|- _ ____ __ __ _ _

<^' j

2.7 

.2

.4
Senecal Incline, Mont., lot 1401

Part of Phosphoria formation measured and sampled on north wall about 75 feet from portal of old 12

Mrs. Kathryn Senecal in SW£Ntf£ sec. 6, T. 9 N., R. 6 W., Powell County, Mont., about 1 mile n

son in July 195^. Beds strike about N. 25 E. and dip 15° NW. in a fault block near the nose 

analyzed by U. S. Bureau of Mines laboratory, Albany, Oreg.

Bed 

no.

Rock description Sample 

no.

Thickness 

(feet)

Chemical analyses 

IpercentL

P 2 0 5 Acid 

insoluble

D member of Phosphoria formation middle part only

D-8 

D-7 

D-6 

D-5 

D-4

D-3

D-2 

D-l

Carbonate rock, cherty - --

Phosphate rock, argillaceous 

Phosphate rock 

T^Vii"! Q"PtVia "£"£> T*or*l/" Q "1 "I "T r*ootiQ 

Carbonate rock, argillaceous, cherty 

7313 -RWS 

7512-RWS 

7511-RWS

7510 -RWS

7509 -RWS

0.7

.4 

1.0 

1.0

1.1

.5 

.6 

3.0

18.9

29.5 

36.0

29.5 

1.60

48.0 

21.9 

7.67

21.9 

52.8
East Elliston, Mont., lot 1397

Part of Phosphoria formation measured and sampled in Billings-Spokane pipeline trench 1 mile east of 

R. 6 W., Powell County, Mont., by R. W. Swanson in June 1954. Beds strike N. 30° E. and dip 3

Elliston anticline. Samples analyzed by U. S. Bureau of Mines laboratory, Albany, Oreg.

Bed

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemi

PaOs

E member of Phosphoria formation basal beds only

E-3

E-2 

E-l

Chert - - -- __ - -- - _ -_ _ _

(^ a -pVv/^K-i o *t~£i ~yie~\r*\T .__ _ _ -. _ __

Chert -

1.7 

A 

1.0

D member of Phosphoria formation

D-7 

D-6 

D-5 

D-4 

D-3

D-2 

D-l

1VI 1 1 c\ ci "t~ i^n^ ^ .«.«....__ . _ ..

Chert- - -- _ __ - - _ _ __

f^Vi^yt* Q "nr^ mnrl Q'ho'n^

7474-RWS 

7^73 -RWS

7472-RWS

0.7 

 7 

2.4

1.5 

2.4

1.2 

.3

14.1 

28.7

28.2

C member of Phosphoria formation upper part only

C

-z

C o

C

T

Quartzite 

(""* QyiVs^vt Q*|~O "ne~\r*\f _ _ ^ _

2.8

1.5 

1.1
Edgar Mine East Adit, Mont., lot 1389

D member of Phosphorla formation measured and sampled about 85 feet from portal of adit on east limb 

T. 9 N., R. 13 W., Granite County, Mont., by R. W. Swanson in September 1953. Beds strike abou

ples analyzed for P2 05 and acid insoluble by U. S. Bureau of Mines laboratory, Albany, Oreg., a

U. S. Geological Survey laboratory, Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P205 A1 2'0 3

FP o, 1 Loss on 

* e2°3 | ignition

Aci

insol

E member of Phosphoria formation basal bed only

E

n 0.1

D member of Phosphoria formation

D-ll 

D-10 

D- 9 

D- 8 

D- 7

D- 6 

D- 5 

D- 4 

D- 3 

D- 2 

D- 1

Phosphate rock 

*pv\/-\ of^v\rt -f- A TV** * »!/ __ ___ _ _ __ ^«.««._»

Phosphate rock 

5960-RWS 

5959-RWS 

5958 -RWS 

5957-RWS 

5956-RWS

5955-RWS 

5954-RWS 

5953-RWS 

5952-RWS 

5951-RWS 

5950-RWS

0.5 

2.9 

2.1 

1.3 

.7

.8 

1.7 

1.4 

.6 

1.1 

.6

24.1 

24.5 

36.2 

30.1 

32.5

19.2 

11.0 

15-7 

29.7 

13.1 

14.0

1.8 

1.2 

1.1 

4.5 

2.2

8.4 

10.2 

9.1 

2.5 

7-9

2.72 

1.02 

.56

1.88 

1.48

2.58 

3.76 

3.82 

1.00 3.58

1.92

2.28 

2.50 3.50 

2.82

4.48 

4.80 

5.00 

3-32 

4.12

33.3

34.2 

5-0 

16.4 

12.2

35.4 

54.2 

41.3 

17.6 

50.5 

61.3

C member of Phosphoria formation not measured
Douglas Creek No. 3 North Mine, Mont., lot 1388

D member of Phosphoria formation measured and sampled at end of adit level about 1,650 feet north 

and Chemical Corporation Douglas Creek No. 3 North mine, sec. 31, T. 9 N., R. 12 W., Granite 

September 1953. Beds strike about N. 5° W. and dip about 50° E. on east limb of Douglas Mou

for P2 0 5 and acid insoluble by U. S. Bureau of Mines laboratory, Albany, Oreg., and for othe

Survey laboratory, Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2 0 5 Ala0 3 Fe 20 3

Loss on 

ignition

in

E member of Phosphoria formation basal bed only

tf. i i .h

D member of Phosphoria formation

D-14 

D-13 

D-12 

D-ll 

D-10

D- 9 

D- 8 

D- 7 

D- 6 

D- 5

D- 4 

D- 3 

D- 2 

D- 1

Phosphate rock - 

Phosphate rock- -- 

Phosphate rock and mudstonePhosphate rock -- 

Carbonate rock -

Phosphate rock - 

Phosphate rock, argillaceousMudstone - 

Mudstone and phosphate rock-- 

Mudstone, phosphatic -

Phosphate rock, argillaceousPhosphate rock 

Mudstone and phosphate rock-- 

Quartzite and phosphate rock5949-RWS 

5948-RWS 

5947-RWS 

5946-RWS 

5945-RWS

5944-RWS 

5943-RWS 

5942-RWS 

5941-RWS 

5940-RWS

5939-RWS 

5938-RWS 

5937-RWS 

5936-RWS

0.8 

.5 

.3 

.5 

.4

1.45 

 7 

.45 

.7

.95 

.5 

.6 

.3

32.8 

35-7 

19.6

35.5 

5.8

31.9

16.8

3.1

13.7

9.7

20.6

34

11

31.4

1.0 

1.3 

9.2 

1.6 

4.5

2.5

8.4 

12.8

10.1

11.2

7.4 

1.5 

9.2 

1.0

0.96

.72

2.78

.64

11.2

.16 

.04 

.36 

.62

2.34

1.72

.68

3.48

2.40

1.88

2.66

4.14

2.48

28.42

.58 

.94 

.14 

.32 

.94

.74 

,66

,18

C member of Phosphoria formation upper part only

C- 5 

C- 4 

C- 3 

C- 2 

C- 1

Limestone, cherty .

Limestone _ - . 0.7 

.5 

.9 

.6

.8
Gird Creek West Limb, Mont., lot 1387

D member of Phosphoria formation measured and sampled on hand trench about 1,000 feet north of Gird 

Granite County, Mont., by R. W. Swanson in September 1953. Beds strike about N. 10° W. and di

Douglas Mountain anticline. Samples analyzed for PaOs and acid insoluble by U. S. Bureau of M

and for other constituents by U. S. Geological Survey laboratory, Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P205 A120 3 Fe 203

Loss on 

ignition

Ac

inso

E member of Phosphoria formation basal bed only

E

n 0.9

D member of Phosphoria formation

D- 9 

D- 8 

D- 7 

D- 6 

D- 5

D- 4 

D- 3 

D- 2 

D- 1

p V» f~\ cf rVh a *1~£^ T^or*!/".- __ _« _

5935-RWS

5934 -RWS 

5933-RWS 

5932-RWS 

5931-RWS

5930 -RWS 

5929-RWS 

5928-RWS 

5927-RWS

0.1 

 9 

.75 

1.4 

1.2

1.8 

1.35 

.45 

.9

10.6 

29.6 

26.8 

34.0 

18.6

9.1 

16.5 

28.4 

23.8

2.7 

1.3 

5.8 

2.2 

8.7

11.5 

9.0 

2.0 

5.4

3.56 

.88 

3.88 

.*96 

1.78

2.44 

1.92 

1.32 

2.14

1.86 

1.40 

3.50 

2.10

3-76

3.96 

3.83

2.20 

2.90

66

9

16

9

37-

55-

41

10

28

C member of Phosphoria formation top bed only

C- 1 1.0
Gird Creek East Limb, Mont., lot 1299

D member of Phosphoria formation measured and sampled in bulldozer trench of Montana Phosphate Produ

north of GJrd Creek, M£ sec. 7, T. 8 N., R. 12 W., Granite County, Mont., by R. W. Swanson in 

and dip 65° E. on east limb of Douglas Mountain anticline. Samples analyzed by U. S. Bureau o

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemipal analyses 

(percent)

P205

Acid 

insoluble

E member of Phosphoria formation basal bed only

E- 1 5.5

D member of Phosphoria formation

D-ll

D-10

D- 9

i^ D

D- 7

D- 6

D- 5 

n- 4 U"" *r

D- 3

U"* <C

D- 1

Phosphate rock and quartzite 

Phosphate rock and phosphatic mudstone 

Mudstone, phosphatic 

Mudstone, phosphatic 

7503-RWS

*7 a r\ o "DT.ro.

7501-RWS 

 "7 c r\c\ "DT.ro.

7499 _RWS

'7kQP_RT.fQ

7497 -RWS

TitQfi-RW^

7495 -RWS

7494 -RWS

7493-RWS

0.6

Di^ 

.05

.85

1

OC

»O

.6

.5

.4

.7

 5

.95 

 5

or\ o

38.7

29.2 

33.0

17.4

8.10

13.2

9.15

21.0

^Q C.

f\£i *~T

2D.7

kfi f.

2 66

16.9 

12.0

44.9

67.7

4Q R ^7*D

62.0

^56 8

OA O

32.0

C member of Phosphoria formation top bed only

C l 2.0
Dissett Mine, Mont., lot

Part of D member of Phosphoria formation measured and sampled in Dissett mine, NE-^ sec. 24, T. 7 N.

All but two samples collected in sublevel about 55 feet above drift, samples 5917-5921 and 59

of raise, 700 feet from portal, and samples 5922-5925 from about 60 feet south of raise; rema

raise and along east wall of drift north of raise. Samples 7491-7492 collected in drift 20 f

level strike about N. 10° E. and dip about 40° W. on east limb of Wyman Gulch syncline, but b

are broken by faults. Section measured by R. W. Swanson and sampled by Swanson and G. Abele 

July 1954. Samples analyzed for P20 5 and acid insoluble by U. S. Bureau of Mines laboratory, 

constituents by U. S. Geological Survey laboratory, Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2 0 5 A12 03 -Pe2 03

Loss on 

ignition

Ac

inso

D member of Phosphoria formation top not exposed

T\ Ol

D-20

±j ±.~y

D-18 

D-17

D-16

D-15

D-14

D-15

D-12

D-ll

D-10

D- 9

D- 8

D- 7

D- 6

D- 5

D- 4

D- 5

D- 2

D- 1

Phosphate rock, argillaceous 

Mudstone, phosphatic 

Mudstone 

~pV» f\ a i~\Vi sa 1~ ^ T>O r* \f _________

"PVlO QTiVlfl "t~£S T^f^f~*\f _ __» _

Mudstone and phosphate rock

Mudstone and phosphate rock

Mudstone, phosphatic (sheared

OK|H Hy^n^r f*ol HoH i

Mudstone 

Covered interval 

Phosphate rock, argillaceous 

COO"Z TDT TQ

trnor} 01 TQ

59 17 -RWS 

5918-RWS

5919 -RWS 

5920-RWS

5921-RWS

59 24 -RWS

5925-RWS

cno^ "Di.rci

7492-RWS

7491-RWS

1.4

1.0

.95

1.9 

.5

.6

.45

1.1

.45

1.1

1.1?

.5 

.5

.6

1.0?

2 

CO o?

1.5

5.0?

1.0

1.0

10.0

5.5

29.4 

10.5

55.4

7-7

r\£l r\

55-7

7.1

Ofl f\

14.6

27.5

6.5

7-9 

1.5 

9-5

1.6

5.5

5.1

2

r- 

 5

4.1

4.1

5.16

5.12 

2.08

3

Or\

i -zR 1.50 

5 CO 5^

1.90 

1.62

4.72

I

rro

 5^

2.98

2.76

1.92 

5.22

1.92 

6.40

2.80

2.62

4.62

2.22

XTn 

t~rc 

75

21

crc; 

55

6

xrii 

22

16

"^8 

jf~j

19

r-T 

24

C member of Phosphoria formation upper part only

p z

C o

p 1

fYl lQY>'f~'7~?'f~£a _. __ _

F ~f TT1£> Th^KuS**? f* Vl fS T» "f~ TT

.2

1.5

4.+

*Cumulative data incomplete because of missing information.
White Gulch, Mont., lot 1403

Section of carbonaceous carbonate rock and mudstone reported as "Phosphoria(?) formation" in U. S. G

(Mertie and others, 1951), measured and sampled in part from outcrop and old mining prospect n

sec. 19, T. 10 N., R. 2 E., Broadwater County, Mont-, by R. W. Swanson in August 1954. Strata 

Quadrant formation to southwest and Madison group to northeast and are assumed to be not overt

and dip 75-80° NE. Beds on northwest side of gulch (51-65) are about on strike with those to 

could be established. The strata were judged "non-Phosphoria" by J. Steele Williams during a 

it is suggested here that they may be part of the Big Snowy group. Samples analyzed by U. S. 

Albany, Oreg.

Bed

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chem

Pa05

Big Snowy group(?) section on northwest side of gulch

65 

64

63 

62 

61

60 

59 

58 

57 

56

55 

54 

53 

52 

51

 , , , 11.6 

8.0 

3.6

.9 

4.4

3-2 

3.2 

2.0 

2.2 

7.0

1.3 

1.4 

1.1 

4.9 

2.9

Section on southeast side of gulch

25 

24 

23 

22 

21

20 

19

18

17 

16

7526-RWS

7525 -RWS 

7524-RWS

4.8 

3.4 

8.0 

2.8 

4.1

.8 

.8 

1.1 

.4 

.8

1.02

1.15 

1.00
15 

14 

l4a

13 

13a

12 

11

10

9 8

7 

6 

5 43

2 1

Carbonate rock 

Carbonate rock 

Covered Interval 

7523-KWS .4 

1.9 

(1.3) 

1.7 

(1.2)

2.8 

1.8 

.9 

4.9 

1.8

3-0 

1.5 

 5 

1.5 

1.7

4.3 

 3

1.00 
Wheatland School, Mont., lot 1584

Phosphoria formation measured and sampled near Wheatland School, SW-jSE^ sec. 7, T. 3 N., R. 1 W., Bro

eastern corner of a major dome. Beds strike about N. 20° E. and dip 25 E. Section measured b

Ruppel and D. E. Brambilla in June 1952. Samples analyzed by U. S. Bureau of Mines laboratory, 

Bed 

no.

Rock description Sample 

no.

Thickness 

(feet)

Chemical analyses 

(percent)

P20 5

Acid 

insoluble

Swift sandstone basal bed only

S

T 3.7

Phosphoria formation

P-81 

P-80 

P-79 

P-78 

P-77 

P-76 

P-75

P-21 

P-20

P-19 

P-18 

P-17

P-16 

P-15 

P-14 

P-13 

P-12

P-ll 

P-10 

P- 9 

P- 8 

P- 7

P- 6 

P- 5 

P- 4

Chert 

Pil1£l Y*"t~ 7"t "t~ ^_ _____ _- --»___.______ _» _._._.

P"h^T*t __ .- _ __ - ___ ___ __ _ __ , __ ________ _ __ _

OiiQT*i" *7 ^ i" o QKiH r*VioY*"t~ -M.JU_ _!._»«. _»j_. j^ __! _

Or^iroT^^H "^Y^^T^V\TS\~\ _ -- - ----- _ - Covered Interval, contains phosphate

T*^r*V~ "PT r\ £) ~t~ _ _ . _ _ . «.__ .._«.^

Probable fault, unit below probably near 

top of Phosphoria formation. Beds above 

probably correlate in part with beds 

17-19 and the upper part of bed 16.

Or^7"OYV~*/3 -^ rf\~ f~*Y?\T£*~\ _ __

^QnH q-hr\Ki/^*

rjhfi-nt ___ -___-. _-.-__- _____ ,_- _ ..._.__..

Covered interval (chert at base) 

PVitfa-rvh

"pVir\ '3'piViffi i~ P* T*or*lr ciT^CT"? T T ci r*arMi ci __ _« >«

Phosphate rock, argillaceous 

PVie>T»t _ _ __ ____ ___ ___________ __ ____ _

Chert _____ ___ _______________

Chert _ 

Covered interval 

Ol1GT*"t~ *7 "1 "f" O JIIL. ~. M-l ^ U__ ^ ___ ___ M-L J-lLOUJl-. -im J!__ I__ JAM. __M ^_ __1LU_

52R-7c 

52R-7b 

52R-7bl

52R-7a

52R-8

3.8 

1.0 

2.0 

1.0 

10.8 

17.0

14.5

2.8 

6.4 

9.8 

.8 

8.1

45.0 

2.0

2.7 

.6 

.2

.5

1.0

13.2

.6

8

-1

1

r-\

5.7 

1.3

26.1 

12.0 

21.0

24.9

15.0

24.4 

38.9 

20.8

26.0

55.1
P- 3 

P- 2

P- 1

3.7 

.6 

10-20

Quadrant formation top not exposed

* Cumulative data incomplete because of missing information.

**Note incompleteness of cumulative data.

Mount Humbug, Mont., lot 1404

Part of D member of Phosphoria formation measured and sampled in a longitudinal bulldozer trench exc

near top of Mount Humbug in E^ sec. 32, T. IN., R. 8 W., Silver Bow County, Mont., by R. W. S

strike N. 70° W. and dip 40 HE. Samples analyzed by U. S. Bureau of Mines laboratory, Albany

Bed 

no.

Rock description

.Sample 

no.

Thickness 

(feet)

Chemical analyses 

(percent)

P20 5

Acid 

insoluble

D member of Phosphoria formation upper part only, top not exposed

D-39

D-^8

D -~V7

D-^fi

D-35

D-34

D-33

D-32

D-^1

D-30

D oo

D-28

D-27

D

r\£i

"P V\ r\ r3~r\\r\ n 4~Q T»i^r""Lr j_

"PVi o *^"nTri 1~ ^ T>i^r"V" TT*cr"t TT?ir"^r^n*^^ i ^ _L um

"PVl/^VO-plVin -J-Q T*r^^l/"ji_ on, ji_ _.^ ». . « ._ a- __i^ u. 

PV*r^ciT^TTTf~o T»r^r"1/" *iT*rr1 T T r»f"orvici

"PV» /^ r? TiTTit" ^ T>r^r"TjT OT*rr1 T T *ir"^(rtin*7

"P V» |^ o ~r^r\ *i t* o T*Pir"lir _i_ _.^^mu j_ _.

"DV» /^v o -piV* n -J-Q T>r^r*l/" *"iT»rr1 T T ir'^Pino

"pV»r^QT^V» o'f-Q T>r^f"V" s3T>cr1 T T £tr*^oim^«. __ ..

T3V»r\OT-^V»o -f~Q T*r^i^l/" Tfcrl T T *ir"^rMi<5^ JL

Mudstone, carbonaceous, phosphatic 

Covered below

7541-RWS

7540-RWS

7539 -RWS

7538-RWS

 /c-zy 'O\J<3.

7536-RWS

7535-RWS 

7534 -RWS

7533-RWS

TC"XO or ra

7R"^1 -RW^

7530-RWS

'ycon TDi.rQ

7528-RWS

0.4

1.1

.7 

2.2

.4

 95 

1.0

.95Qi-

.05

.95

.9

Qr-

.05

.7

2.0

1 D-l5.4o

32.8

r\fL -I

-2CT Q

35.O

/-,/" £ 

27.2

22.3

34.0

oo c 29.5

OC C OO 

/-,/- gr\fl o

11.9 

8.90

61.9

13-9

23.3

4.97

17.0 

22.1

33.9

8

~\ r\

17.0

24.3 

21.8

22.8

39.6 

44.3
Logan, Mont., lot 1367

Bed P-ll of Phosphoria formation at Logan, Mont., sampled by R. W. Swanson in August 1954. For sectio

 Geological Survey Circular 326 (Peterson and others, 1954)« Sample analyzed by U. S. Bureau of 

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses 

(percent)

P20 5

Acid 

insoluble

Phosphoria formation

P-ll 7ROr7 pt-JQ 1.1 8

Tr\ *7~\ C

fJ-O

Cave Creek, Mont., lot 1257

Base of D member and upper part of C member restudied at Cave Creek trench, Mont., by R. W. Swanson, 

in September 1951. For section see U. S. Geological Survey Circular 260 (Klepper and others, 1

by U. S. Bureau of Mines laboratory, Albany, Oreg.

Bed 

no.

Rock description Sample 

no.

Thickness 

(feet)

Chemical analyses 

(percent)

P205

Acid 

insoluble

D member of Phosphoria formation basal beds only

D- 3

D- p

D- 1

Cumulative figures carried forward 

Sandstone, phosphatic 

5586-RWS

5587 -RWS

I

0.3 1 26.6

.9 | 13-5

27-9

61.3

C member of Phosphoria formation top beds only

C- 4

D- "^

C o

C

-\

Qo rtA o "i~OnO TtVlO^'T'lVln "t" "i f*

Sandstone, cherty 

Sandstone, cherty 

RCiRR-RU^

RRRq _T?W^

Reran -RW1^

2.2

.4

.9

2

C

9.6

2.6

4.2

70.7 

87.3

ryQ £
Little Long Valley, Idaho, lot 1391

Phosphatic shale member of Phosphoria formation measured and sampled from bulldozer trench dug by J

side of Little Long Valley in KE£ sec. 10, T. 7 S., R. 43 E., Caribou County, Idaho, by R. P. Sh

1955- Beds strike N. 30° W. and dip 50° SW. on east limb of Wooley Valley anticline. Sample

soluble by U. S. Bureau of Mines laboratory, Albany, Oreg., and for other constituents by U. 

Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P205 AlaOa Fe 2 0 3

Loss on 

ignition

A

ins

Rex chert member of Phosphoria formation basal bed only

R

-\ PVipT"'!- _______ _____ _ ________ 1.5

Phosphatic shale member of Phosphoria formation

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

P-44 

P-43

P-42

P-4l 

P-40 

P-39 

P-38

P-"57

Phosphate rock, argillaceous and

MnH ci i" i"\r"no _.«.___»«-..._ _. __ _» _.

IWnH ci'tr^r'no .»__ _._.._._

Muds tone 

Muds tone 

Phosphate rock 

Phosphate rock and mudstone 

Phosphate rock 

Phosphate rock, argillaceous and

Mudstone 

Mudstone 

Mudstone and argillaceous phosVludstone and argillaceous phosMudstone 

2 7410-RPS 

2 7409-RPS 

2 7408-RPS 

2 7407 -RPS 

2 7406 -RPS

2 7405-RPS 

2 7404-RPS 

2 7403 -RPS 

2 7402-RPS 

2 7401-RPS

2 7400 -RPS 

^7399 -RPS 

7398 -RPS

7397 -RPS 

7396-RPS

7395-LDC

7394 -LDC 

7393-LDC

7392-LDC 

7391 -LDC

7390 -LDC 

7389 -LDC 

7388 -LDC 

7387 -LDC 

7^86 -T .DO

2.0 

2.0 

2.0

1.5

4.0

 7 

4.2

1.9 

1.1 

.8

5-2

1.5 

2.2

11.0 

3.4

1.3

14.0 

2.0

18.0 

2.0

3.0 

5-6 

3.6 

.4 

.q

36.2

22.2 

7.4

4.2

14.5 

4.3

10.4 

7-7

1.7 

2.2 

3-4

22.9 

2.2

1.5

6.2

5.8

0.64 

2.04

2.12

5.66 

9.96

4.90

2

6

7

4

8

5

7

8

8

8

3

8
Little Long Valley Continued

Bed 

no.

Rock description Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

PsOs A12 03 FezQs

Loss on 

ignition

Acid 

insolu

Phosphatic shale member of Phosphoria formation Continued

P-56 

P-55 

P-54 

P-55 

P-52

P-51 

P-30 

P-29 

P-28 

P-27

P-26 

P-25 

P-24 

P-25

P-22

P-21 

P-20

P-19 

P-18 

P-17

P-16 

P-15 

P-14 

P-15 

P-12

P-ll 

P-10

P- 9 

P- 8

P- 7 

P- 6 

P- 5 

P- 4 

P- 5 

P- 2 

P- 1

Mudstone, phosphatic 

MnH ^T"hon& _ _ ..

"pVi (~\ Q T"»Vi o "h^ Y*f^r»lr o Y*cp~1 1 1 Q r»&cv i a 

Mudstone 

WlnH Q"hc^no __ _

"pV|("\OTlV» Q "f"Q Y*C^f"*lr««-« __« _ _

Mudstone and argillaceous phosMi IC^ a + /^Kio _ _ _

Mudstone, argillaceous phosphate

i/I nH Q"H("\n& . mm ~

Mudstone, phosphatic 

3V|(^OTjVici "l~o T*Or*l^" O T*Cf"1 ~\ ~\ Q r*&(^l Id ~-

T^ Vi c\ *smVi o "ho ~rtc\r*\r _ .^ m^ j. j^ ^^ _^.

Mudstone and carbonatic mudstone 

7385-LDC 

7584-LDC 

7383-LDC 

7582-LDC 

7581-LDC

7580 -LDC 

7579 -LDC 

7578-LDC 

7577-LDC 

7576-LDC

7575-LDC 

7574 -LDC 

7575-LDC

7572-LDC 

7571 -LDC

7570 -LDC

7569 -RPS 

7568-RPS 

7567 -RPS 

7566-RPS

7365-RPS 

7564-RPS 

7565-RPS 

7562-RPS 

7561-RPS

7560 -RPS 

7559-RPS 

7558-RPS 

7557 -RPS 

7356 -RPS 

7355-RPS 

7554-RPS 

7355-RPS 

7352-RPS 

7551-RPS 

7350 -RPS

1.0 

2.0 

2.0 

1.0 

5.5

1.8 

2.0 

.8 

.8 

1.5

1.8 

2.6

.5

.8 

.45

 7

5.0 

6.0 

1.4 

2.5

1.0 

4.2 

5.0 

4.8 

4.0

6.0 

5.0 

5-5 

.5 

6.0 

.5 

4.5 

.2-. 8 

5.8 

5.5 

 5

15.7

1.1 

17.8 

1.1 

1.4

18.9 

1.9 

24.3 

1.1 

28.7

8.6 

2.7 

7.8

13-5 

5.0

4.5

12.8 

9-7 

2.7 

8.8

2.6

8.8 

15.8

15.7 

28.8

18.2 

15.5 

54.6 

21.4

3:1

26.8 

28.2 

52.4 

1.5 

55.4

4.4

1.7 

6.5 

2.1 

10.5 

4.7

1.5

 9

1.72

.64 

2.14 

.84 

5.20 

1.02

.60

1.58

6.64

5-94 

6.10 

5.76 

6.90 

7-72

8.00

5-54

52.1 

88.5 

44.5 

88.0 

88.6

57-2 

85.9 

29.0 

88.1 

17.7

65.2 

8o.l 

65.6

47.0 

77.1

75.0

59-4 

50.5 

75.6 

59.2

8o.O 

60.5 

43.8

45.7 

16.5

56.5 

44.8 

5.0 

54.5 

8.0 

63-5 

18.5 

19-2 

5.7 

48.3 

4.5

2 Sample lost in shipment.

**Note incompleteness of cumulative data.
East Georgetown Canyon, Idaho, lot 126ja

Part of phosphatic shale member of Phosphoria formation measured and sampled in bulldozer trench of 

ative on east side of Georgetown Canyon about 1,000 feet above Twin Creek in NE^NW^ sec. 30, 

County, Idaho, by L. D. Carswell in September 1953- Beds strike N. 10° E. and dip 70° W. on 

Section measured represents the 40-foot covered interval in previously described section, lot 

logical Survey Circular 262 (O'Malley and others, 1953). Samples analyzed for P20 5 and acid 

Mines laboratory, Albany, Oreg., and for other constituents by U. S. Geological Survey laborat

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2 05 A12 03 Fe203

Loss on 

ignition

Ac

inso

Phosphatic shale member of Phosphoria formation partial section

P-20 

P-19 

P-18 

P-17 

P-16

P-15 

p-14

P-13 

P-12 

P-ll

P-10 

P- 9 

P- 8 

P- 7 

P- 6

P- 5 

P- 4 

P- 3 

P- 2 

P- 1

"pVi (~\ cs T~\Vi Q + G* T*or»lr £5T*fT'T 1 1 Q r»/7toi i o

"PVi t~\ ctTiVi Q "ho T>O c* \r

"DVi f-\ qT\Vi Q'hck T» o <" If" QT* rf^ ~\ ~\ Q r*a*t^\\id

Upper 0.4 foot of bed P-16 is black 

carbonaceous zone.

"PVlC^QTiVift "t~d T*i^r»l/~ flycr^T ~\ ~\ ar»eki^ii<a

Carbonate rock _________

PVin^TiVifl i~f* T*nr*V_ _

Phosphate rock -_ - 

Phosphate rock, argillaceous _ 

PVin ^tTlVifl ~\~f^ Voplr fl T*cr"1 "I "I Q f"^ i^n Q

7297 -LDC

700^ T TV

"~7OOC T T\^t

7294 -LDC 

7293-LDC

7292-LDC 

7291 -LDC 

7290 -LDC 

7289 -LDC 

7288 -LDC

7287 -LDC

"7PR^i T "HP

7285-LDC 

7284 -LDC 

7465 -LDC

7h.fth. T nr

7h.f\^ T nr

7462-LDC 

7461 -LDC 

7460 -LDC

6.0 

.8 

.6 

.9 

1.2

2.3 

2.3

3-0 

2.4 

1.0

1.0 

.5 

2.0 

1.6 

2.0

2.8 

3-8 

 7 

.7

1.8

23.0 

26.7 

4.1 

28.6 

19.0

24.1 

3.8 

11-3 

1.1 

21.0

25-4 ' 

27.2 

22.6 

24.0 

12.4

26.9 

27.9 

27-1 

8.6 

22.1

5-0 

3.7

2.6 

4.9

3.7

3.3

3.4 

2.6 

4.1 

3-5

3.0 

2.8 

2.8

4.0

1.46 

1.58

1.48 

2.08

1.60

1.16

1.16 

 54 

1.28 

1.34

1-32 

1.10 

1.16

1.38

12.12 

11.70

10.60 

16.98

11.40

12.00

8.76 

12.24 

11.32 

10.80

9-66 

9.08 

8.84

10.04

22

15

69

12

27

21

17-

50-

20.

26.

22.

15-

27.

23-

51.

18.

17-

21.

58.

24.
Clear Creek, Idaho, lot 1392

Phosphatic shale member of Phosphoria formation sampled in bulldozer trench of Monsanto Chemical Com

R. 45 E., Caribou County, Idaho. Beds strike N. 30° E. and dip 15° -W. on east limb of Webster 

R. P. Sheldon and L. D. Carswell and sampled by Sheldon, Carswell, and G. Abele in September 19

'and acid insoluble by U. S. Bureau of Mines laboratory, Albany, Oreg., and for other constitue

laboratory, Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2 0 5 A1 2 03 Fe2 03

Loss on 

ignition

Aci

insol

Rex chert member of Phosphoria formation basal bed only

R- 1 7549 -RPS

Phosphatic shale member of Ph

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

M n r\ ci + f~\r} & « ~ *

TDV-i /-\ C3 T-\V-i Q 4- ci T>f"slf"> l^ QT>Ot "1 ~\ ~\ Q f> £1 f"M 1 Cl

-pV-i/-\caT~\'hQ 4- £1 T'fM'"*!^-. _ «

"pV-i /-i o T"Vh Q ~\~ f* ~r> f~\r*\r ~* *» .

"DV-i (-) cy T\h Q + o y> or* lr_«._ _ _ _. _.

TDV-i pi^TVh o "h & ~Y*rw~t \r , . _ _

Mudstone and phosphatic mudstone-- 

Mudstone, phosphatic and argil7348 -RPS

7~x,h.7 RP1^

7346-RPS

 / ZLilC RpQ

7344 -RPS 

7343 -RPS

 VXjfO TD"DQ

7341-LDC 

7340 -LDC

7339 -LDC

7337-LDC 

7336 -LDC 

7335-LDC

7334-LDC -7-z.-z.-z, T TV"1

7332 -LDC 

7331 -LDC 

7330 -LDC

73 29 -LDC 

7328-LDC 

7327-RPS

73 26 -RPS 

7325 -RPS

0.5 

10.5

.7 

1.2

 5

2.3 

 7 

2.9 

1.4 

 9

1.6 

 9 

 7 

2.4 

2.3

.8 

1.4 

.9 

2.6 

4.5

2.5 

2.6

1-5

4-7 

1.0

21.6 33-

osphoria formation base not exposed

2.2 

3.0

1.8 

19.1

2.7 

24.6

1-5 

35.9 

36.4

5.8 

23.6 

10.3 

31.6 

32.9

18.2 

27.8

35-5 

36.0

27-9

25.8 

18.3 

6.0

17-9 

29-5

5.0

 9 

.4

2.8

2.1 

1.7

3-3 

1.2

.9

2.8

3.4

2.7

1.84

.48 

.24

1.16

1.02 

.76

1.22 

.48 

.36 

1.04

1.12

2.56

6.94

4.86 

2.76

11.92

4.98 

5-90

7-90 

5.26 

6.48 

13-42

16.00

4.66

72.6 

69-5

16.0 

36.6

74.7 

23-5 

76.9 

3-6

5-9

69.0 

17.2 

59-4 

13-7 

9.4

41.8 

18.7 

5.0 

3.1 

12.6

15-7 

31.4 

68.8

35-7

18. .
P-30 

P-29

P-28 

P-27

P-26

P-25 

P-24

P-25

P-22 

P-21

P-20 

P-19

P-18 

P-17

P-16 

P-15

P-14 

P-13

P-12 

P-ll

P-10 

P- 9 

P- 8 

P- 7 

P- 6

P- 5 

P- 4 

P- 3 

P- 2 

P- 1

Mudstone and argillaceous phosMuds tone and argillaceous phosMudstone and argillaceous phosMudstone, phosphatic mudstone, and

Mudstone and carbonatic mudstone-- 

Mudstone and cherty, argillaceous

Mudstone and argillaceous phosMudstone and argillaceous phosCarbonate rock, argillaceous, mudQ~t~ f~\"n^ flinc^ r*Vi^T*'t~ _ .. «

Mudstone, phosphatic mudstone and

Mudstone and argillaceous phosMudstone, phosphatic (highly

Sample missing (highly weathered

"pVi ociTVhfl 1~ ^ ~r*t~\r*\r a Y*cfl ~\ ~\ fi^^r^ii 11^ 

Carbonate rock, phosphatic 

Phosphate rock 

7324 -EPS

73 23 -EPS 

7322-EPS

73 21 -EPS 

7320 -EPS 

7319 -EPS 

7318-EPS

7317 -EPS 

7316 EPS

7315 -EPS 

7314 -RPS

73 13 -EPS 

7312 -EPS

7311-LDC 

7310-LDC

7309 -LDC 

7308-LDC

7307-LDC

7306 -LDC 

7305 -LDC 

7304 -EPS 

7303 -EPS 

7302-EPS

7301 -EPS 

3 7300 -EPS 

7299 -EPS 

7298 -EPS

3-0

3-3 

1-7

2.2 

6.6 

4.0 

3-4

4.2 

 7

7.4 

4.0

5.2 

7.0

2.9 

1.0

2.2 

1.2

5-0

7.0 

1.4

3.3

2.4 

4.6 

1.2 

7-1

1.0

3.5

1.4 

4.0-6.0

11.4

8.8

5.2

7-9 

11.5 

1.3 

12.2

9-5 

2.3

11.6

1-7

1.0 

3-9

8.8 

6.9

18.0 

5-8

11.7

10.5 

.9 

25^3 

16.5

25-7 

4.8

8.3 

33-7

3-0

2.7

1.2

1.06

1.12

.60

12.54

7.70

6.08

5

5

7

6

5

6

5

6

8

3

41

40

75

56

67

32

69

46

57

28

18

45

23

11

9

4

* Cumulative data incomplete because of missing information.

**Note incompleteness of cumulative data. 

3 Sample lost in shipment.
Phosphor-la Gulch, Idaho, lot 1393

Part of phosphatic shale member of Phosphoria formation measured and sampled 2,000 feet from portal 

erative mine in Phosphoria Gulch in NW£-Ntf£ sec. 30, T. 10 S., R. 45 E., by L. D. Carswell in 

K. 15° E. and dip 45° W. on east limb of Georgetown syncline. Samples analyzed for P2 05 .and 

Mines laboratory, Albany, Oreg., and for other constituents by TJ. S. Geological Survey labora

Bed

no. Rock description

Sample 

no-.

Thickness 

(feet)

Chemical analyses (percent)

P2 05 Ala Oa FesOa

Loss on 

ignition

Ac

inso

Phosphatic shale member of Phosphoria formation lower phosphate z

P- 6 

P- 5 

P- 4 

P- 3 

P- 2 

P- 1

Phosinhat6 rc^lr

7415-LDC 

7414-LDC 

7413 -LDC 

7412-LDC 

7411 -LDC

1-5 

.9 

.8

 7

 5

31.6 

34.0 

35.4 

30.3 

5.6

1.4 

.8 

-.6 

1.7

0.50 

.42 

.40 

.80

7-44 

7.10 

6.10 

7.96

6

2

1

9

57
South end Crawford Mountains, Utah, lot 1395

Rex chert member and upper part of phosphatic shale member of Phosphoria formation measured and sam

R. 7 E., Rich County, Utah, by T. M. Cheney in October 1953- Beds strike N. 10° E. and dip 8

Crawford anticline. Samples analyzed for P2 0s and acid insoluble by U. S. Bureau of Mines la

for other constituents by U. S. Geological Survey laboratory, Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P 20 5 A12 03 Pe2 03

Loss on 

ignition

Ac

inso

Rex chert member of Phosphoria formation

R

1 V - M

R-16

R-15 

Ri ii

R

-i -z. L2

R-12

R

-| ~1

R-10

R- 9

R- 8

R

<-7

R- 6

R- 5

R- 4

R- 3

R Q

R

-I

Covered Interval: predominantly

Chert .- -- ----- -------

Covered interval: float dominantly

Covered interval: float dominantly 

carbonate rock and silty carbonCovered interval: float dominantly

Chert 

2.0

7-3

3-5 

8~

8 ^.

35-0

21.0

23.0

7-0 

21.0

4.5

8

~

10.0

4.0

8

r- 5

/~jrr r\

5-0

Phosphatic shale member of Phosphoria formation upper part only

P- 9 

P- 8 

P- 7

P- 6 

P- 5 

P 4

P- 3 

P- 2 

P 1

Phosphate rock, cherty 

Phosphate rock, cherty, and cherty

Mudstone and carbonatic phosphate

Chert 

7471 -TMC

7470 -TMC 

7469 TMC

7468 -TMC

Tll^T rpMP

7466 TMC

0-7 

2.6

2.4

1.9 

3-7

 9 

2.2 

2.1 

8.0

8.5

10.5 

33.6

22.2 

32.9 

29.8

8.0

3-7 

.9

3-9 

1.0 

2.1

3.40

1.60 

.64

1.60 

.56

.80

9.24

21.40 

5-46

9.38 

6.30 

6.62

55

27

4

23

4

10
Sugar Pine Creek, Utah, lot 1394

Upper part of phosphatic shale member of Phosphoria formation measured and sampled in hand trench 150 

in SE£ sec. 4, T. 8 N., R. 5 E., Rich County, Utah. Beds are overturned and strike N. 25° E. a

by T. M. Cheney and sampled by Cheney and Richard Hughes in September 1953. Samples analyzed f

U. S. Bureau of Mines laboratory, Albany, Oreg., and for other constituents by U. S. Geological 

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2 05 AlsOa FesOa

Loss on 

ignition

Acid 

insolu

Rex chert member of Phosphoria formation basal bed only

R l nVioY'i- ________ _ __ 8.0

Phosphatic shale member of Phosphoria formation top and bottom parts o

P-19

P 18

P-17 

P 16

P-15

P-14

P-15

P-12

P-ll

P-10

P- 9

P- 8

P- 7 

P- 6

P- 5

P- 4

P- 3

P- 2

P- 1

"PVt c\ ci "piVi Q "h £^ ~Y* r\ r* \r

"pVi/-\o-r\Vi Q + Q ~Y*r\r*\r _. _

Phosphate rock and phosphatic

Phosphate rock and phosphatic

"pVi/-\o-i^ViQ ~t~ c* ~Y*r^r*\f~ &Y~if~\ mti(*^ci"h (^T^P*

"P Vi o ° Y*I Vt *i + f^ T1 r\ r* \r

'pV|(^c3Tr\Vi Q i~f^ ~Y* f~\ r*\r _. . _

"pVi/^vcj-r^Vio "ho T*or*l^" . -»_»-»-» «. _. . 

Possible fault zone, parallel to 

strike in upper 1.0 foot of bed 

P-5-

Wll lf~\ Q"t~ OT1O "PlVlf^QT^VlQ i" "i r*

"DV* /-\ q -r\V» Q i"Q TJO/^l^" QT'O*'? 1 1 a/^f^f^tlQ

M 1 1 (~\ CJ i" OT1!^

Muds tone, phosphatic and muds tone -

 yliii."^ "PMP

7'iLiLp_rrMP

Tii-ii-1 TMP

 yiliLO-TMP

TlL^Q TMP

7438 -TMC

yii'-ST'-TMP

Vil"^^i TMP

7435 -TMC

74^4 -TMP

7il"^"^ TMP

H'h'z.O TMP

Yli"^! TMP

yll."^O-TMP

r7lLpQ_TMP

7iloft TMP

7h.O7 TMP

r7iLpfi_TMp

74 25 -TMC

1.1

1.1

1.1

 5

1.9

2.8

1-5

1-5 

1.2

1.1

1-7 

1.6

l.l

1.6

.4

1-5

32.4

9-5 

29.4

12.7

30.4

32.9 

31.4

30.3 

33-6

35-3

or* ~z. <^9-3

r\£ ll

n i~i Q

33.2

23-3

11-5

i Q r\

3-3

, 11-7

1

Q/-N

8

- 

.0

2-9 

8.2

2.9

1.7

2.4

2.2

-i p

1.2

3.1 

3.4

5.6

1.5 

4.4

8

).

3

p.0

8

-2

 3

7.2

l.6o

3.32

1.32 

2.38

.7*

.24

.46

 70 

.20

.14

of.

r-O

 5o

1.16

.40

-i r^f

2.84

2.34

1.90 

3.26

5

nC.

.76

7-70

8

-z r\

9.64

3

i"7/~v

.70 

ii £i-\

6 ^8 \J . J/O

7.74

5

or\

4.46

3

OO

.dd

-i /-\ oQ

13-30

f. Ok

16.80

13-64

4.48

5

C.r\ 

.62

4.28

8

-1

59-9

13.1 

50.6

14.0

9-7

12.1

13-6

9-2 

4.2

16.4

17-9

29.7 

6.9

19.3 

45-6

39-0

ryO -z

7«.3 

55-3

Wells formation top bed only

Hrr 1 1.6