STRATIGRAPHIC SECTIONS OF 

THE PHOSPHORIA FORMATION 

IN IDAHO, 1950-51

is report concerns work done on 

behalf of the U* S. Atomic Energy 

Commission and is published with 

the permission of the Commission.
UNITED STATES DEPARTMENT OF THE INTERIOR 

Douglas McKay, Secretary

GEOLOGICAL SURVEY 

W. E. Wrather, Director

GEOLOGICAL SURVEY CIRCULAR 327

STRATIGRAPHIC SECTIONS OF THE PHOSPHORIA FORMATION

IN IDAHO, 1950-51

By R. A. Smart, R. G. Waring, T. M. Cheney, and R. P. Sheldon

This report concerns work done on 

behalf of the U. S. Atomic Energy 

Commission and is published with 

the permission of the Commission.

Washington, D. C., 1954

Free on application to the Director, Geological Survey, Washington 26, D. C.
STRATIGRAPHIC SECTIONS OF THE PHOSPHORIA FORMATION

IN IDAHO, 1950-51

By R. A. Smart, R. G. Waring, T. M. Cheney, and R. P. Sheldon

CONTENTS

Lot no. Page

Introduction........................ 1

Acknowledgments ................... 1

Stratigraphy of the Phosphoria

formation in southeastern Idaho ... 4 

Stratigraphic sections .............. 4

References......................... 4

Tables of stratigraphic

sections

Fall Creek ................... 1338 5

Lot no. Page

Tables of stratigraphic 

sections Continued

Wolverine Canyon ........... 1322 8

Bear Creek ................. 1353 11

Fort Hall Indian 

Reservation ............... 1349 14

Snowdrift

Mountain.................. 1372 15

Mud Spring.................. 1351 20

Figure 1. 

2.

ILLUSTRATIONS

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

Generalized section of Phosphoria formation at Trail Canyon, Idaho '[lot no. 1206]

Page

2

3

INTRODUCTION

The U. S. Geological Survey has recently measured 

and sampled the Phosphoria formation of Permian age 

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 assembled. This 

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

of this series and is the sixth report of data gathered 

in Idaho; it includes the data gathered in Idaho during 

1950 and 1951. 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. R. Cressman, F. D. Frieske, R. A. Gulbrandsen, 

H. W. Peirce, J. A. Peterson, B. K. Replogle, and 

M. A. Warner participated in the description of 

strata and the collection of samples referred to in 

this report. Crushing and splitting of samples in the 

field was done by T. K. Rigby. The laboratory preparation of samples for chemical analysis was done in 

Denver, Colo., under the direction of W. P. Huleatt.

Most of the P205 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 rest were made in the Survey 

laboratory in Denver, Colo., under the supervision 

of L. F. Rader, by chemists M. Appling, G. T. Burrow, 

N. Jammer, W. Mountjoy, and M. Stevens. The 

A1 2 03 , Fe 2 03 , and loss-on-ignition analyses were 

made in the Survey laboratory in Washington, D. C., 

under the direction of J. C. Rabbitt, by chemists 

H. Alberty, I. Barlow, and C. Hoy.

The data were compiled largely by K. 8. Bergman 

under the supervision of R. W. Swanson. Anita Wise 

organized the tabular data.

ACKNOWLEDGMENTS

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

Williams, and A. E. Weissenborn who have given 

much 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 parties by the local residents, 

property owners, and operating phosphate companies, 

who furnished information and services and gave 

access to property. A. J. Winters, 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 San Francisco 

Chemical Co.; G. A. McHugh of the Simplot Fertilizer
Outcrop of Phosphoria formation, 

dotted where questionable

01372

Location and lot number of sample 

locality included in this report

Location and lot number of sample 

locality included in other reports

Recompiled and modified from Clabaugh, 1946

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

2
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7

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19 

2

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14 

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Upper »hale member (not eicpoaed)

Rez chert member (top rot ezpoeed) 

Chert: hard, black, thin-bedded

Mndatone: hard, black, thin-bedded

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

Chert and limeetone: 80 percent hard, black, thin-bedded chert; 20 percent hard, 

dark-gray, massive limeetone

Phosphatic shale member

Phoephate rock: oolitic, nodulnr, medtum-hnrd, light brownieh-gray; contains 

omphalotrochue gastropoda

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

Phosphate rock: argillnceous, oolitic, piealitic, medium-hard, brownish-gray to

black, thin-bedded; contains a few limestone concretions 

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

Mndstone: medium-hard, brownish-gray, thin-bedded; 2-foot limestone bed at top; 

contains phosphstic nodules in middle 12 feet

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

Mndstone; hard, brownish-gray, thick-bedded

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

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

joints

Mndstone: phospbatic, nodular, oolitic, medium-hard, brownish-gray to blrck, 

thin-bedded

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

Mudstone: phosphatic, oolitic, soft, brownish-black to black, thin-bedded; cootaias many limestone leeses

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

Mudstone: soft, brownish-black, thin-bedded mndstone 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: phosphstic, oolitic, nodular, soft, brownish-black, thin-bedded

Limestone: hard, brownish-gray, massive. 'False cap* limestone

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

fissile

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

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

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

(tabular) fossil fragments

Veils formation

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

3
Co.; and O. A. Power of the Westvaco Chemical 

Division, Food Machinery and Chemical Corp., 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 

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

thick and an upper member, the Rex chert, about 

240 feet thick. Though not well defined at the type 

locality, a third member, a thin-bedded cherty mudstone 15 to 75 feet thick,overlies the Rex chert member 

in most of southeastern Idaho and western Wyoming. 

The phosphatic shale member thins progressively 

northward to a thickness of about 60 feet.

The Phosphoria formation overlies the Wells 

formation of Pennsylvania age and underlies the 

Dinwoody formation of Triassic age. The upper 50 to 

75 feet of the Wells formation consists of a gray fossiliferous cherty limestone that contains some thin phosphatic layers and may be the correlative of the lowermost member (A member) of the Phosphoria formation 

in Montana and, according to McKelvey, the lower 

limestone member of the Park City formation in Utah.

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. They may be grouped into several broad units, as yet unnamed, as shown in figure 2.

STRATIGRAPHIC SECTIONS

Abstracts of stratigraphic sections measured at 

six localities, and the available analytical data, are

presented in the following pages. Their locations, 

as well as the locations of sections reported previously 

(McKelvey and others, 1953a and b, and O'Malley and 

others, 1953, Sheldon and others, 1953, Davidson and 

others, 1953) are shown in figure 1.

REFERENCES

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

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

Survey, Strategic Minerals Inv. Prelim. Map 3-198.

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.

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

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

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

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., Armstrong, F. C., Gulbrandsen, 

R. A., and Campbell, R. M., 1953b, Stratigraphic sections of the Phosphoria formation 

in Idaho, 1947-48, part 2: U. S. Geol. Survey 

Circ. 301.

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.

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., 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.
Fall Creek, Idaho, lot 1338

Phosphoria formation measured and sampled in bulldozer trench and at natural exposure on north side of Fall Creek 

T. 1 N., R. 43 E., Bonneville County, Idaho, on the southwest limb of an anticline trending northwest. Beds 

Section measured and sampled by R. P. Sheldon, F. D. Frieske, T. M. Cheney and R. G. Waring in September 

P2O5 and acid insoluble by U. S. Bureau of Mines laboratory, Albany, Oreg., and for other constituents by T

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

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent).

P2°5 A12°3 Fe203

Loss on 

ignition

Ac

insol

Rex chert member of Phosphoria formation top not exposed

 S.\3

 it

" iJ

~ ifR- 1 1

R- 1 0

R Q

R Q

R_ 7

R- 6

R- 5

R- A.

R

_ -i

R _ f

R_ i

Chert 

Phprt ---------- -

fl-101-t

Chert 

5339-RGW

26.5

22.0 

31.0

.2 

1.4

1.9

5.2

6.4

4.2

.4

1 Q

2.7

7.4

? 4

i Q n

?c 4

'

9 

P-33 

P-32 

P-31 

P-30 

P-29

P-28 

P-27 

P-26 

P-25 

P-24

Phosphatic shale member of Phosphoria formation

Carbonate rock --- -- ----.

Phosphate rock, argillaceous- --- 

Phosphate rock; fos. col. no. 12293- 

Carbonate rock, argillaceous------

Phosphate rock, argillaceous ----

Mudstone, carbonatic------- -

Phosphate rock, argillaceous--- - Mudstone--- - --------- --

Carbonate rock, argillaceous------

Mudstone, carbonatic -----------

P-23 Mudstone5338-RGW 

5337-RGW 

5336-RGW 

5335-RGW 

5334-RGW

5333-RGW 

5332-RGW 

5331-RGW 

5330-RGW 

5329-RGW

5328-RGW

1.0

1.0

1.4

.6

.4

.7 

1.4 

1.3

1. 1 

.6

2. 1

0.8 

30". 8 

34.3

1. 1 

27.2

1.0

17.6

.5

.6

4. 1

6.0

14

20

35

30

15

53

28

70

31

50

66

1 Fossil collection made by J. E. Smedley, U. S. Geological Survey.

2 Acid-insoluble analysis probably too high.
Fall Creek Continued

Bed 

no.

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

Rock description

f"1 a T*l"^nnQ to t*cir*\r st T*cri 1 1 st r*oon ct

TVyTii H Qtono f*a i^hifina 1 1 f* _ _ __ _ __

f** a T*hf\na to t*f\f* If o T*CM 1 1 a f*o<"*n Q

Phosphate rock, argillaceous, and

aT*cfillaf*Of\iiQ f* a T* h f\n si t o T* Of* lr ___________

Phosphate rock and carbonatic phosphate

Carbonate rock, argillaceous, and

Phosphate rock, argillaceous and 

carbonate rock, interbedded; fos. col. 

no. 12292 

Phosphate rock and argillaceous 

phosphate rock ---- ---- - --

Phosphate rock and mudstone,

Carbonate rock, argillaceous, contains 

small amounts of fluorite; fos. col. 

no. 12291 

Phosphate rock, calcareous, and 

phosphatic mudstone; fos. col. no. 12290-

Carbopate rock, argillaceous and

A fault near base of bed P-l omits 

. 5 to 5 feet of section.

Sample 

no.

5327-RGW 

5326-RGW 

5325-RGW 

5324-RGW 

5323-RGW

5322-RGW 

5321-RGW

5320-RGW 

5319-RGW 

5318-RGW

5317- RPS

5316- RPS

5315- RPS 

5314- RPS

5313- RPS

5312- RPS 

5311- FDF

5310- FDF 

5309- FDF 

5308- FDF

5307- FDF 

5306- FDF

Thickness 

(feet)

2.8 

2.2 

1.2 

.9

.4

.9 

1.4

1.6 

3.3 

.9

2.4

2.6

2. 1 

1.7

.7

1.0 

.9

2.4 

1.2 

.9

.7 

9.6

Chemical analyses (percent)

0. 7 

.7 

10.7 

1. 5 

12.6

2. 7 

13.2

24.4 

1.6 

3.9

10.2

15.8

24.2 

5.5

26.3

2.4 

20.4

28.9 

.6 

31.7

3.5 

.9

A12°3

3.20

2.77 

1.83

2.55

.62

3.79

5.72 

5.36 

.62

Fe2°3

1.25

1.46 

.51

.92

1.78 

1.50

.75 

1.80 

.43

Loss on 

ignition

22.62

15.60 

37.88

10.54

26. 72 

16.83

9.02 

19. 78 

6.90

Acid 

insolu

25.8 

49.6 

40.3 

24.9 

33. 

15.0 

26.4

. 11.7 

23. 

28. 

26. 

15. 

12.0 

6.7

12.6

37.7 

18.7

6.7 

55.0 

4.3

72.3 

35.9
Wells formation upper part only

Cw- 1 Chert, sandy, calcareous, and

	calcareous sandstone ----------

Cw- 2 Chert, sandy, and calcareous

	sandstone ---------------------

Cw- 3 Dolomite, argillaceous, sandy-- 

Cw- 4 Dolomite, silty and chert; fos. col.

	no. 12289 -- 

Cw- 5 Limestone, argillaceous---------

Cw- 6 Siltstone and calcareous siltstone -

Cw- 7 Siltstone ---- ----- --------

Cw- 8 Siltstone, calcareous - --------- --

Cw- 9 Siltstone, sandy --- - --------

Cw-10 Sandstone ----------------------

Cw-11 Covered interval-------------- 

Cw-12 Sandstone, calcareous----- ---

Cw-13 Covered interval--- - ------

Cw-14 Limestone ---------------------

Cw-15 Covered interval----------------

Cw-16 Limestone ---------------------

Cw-17 Limestone, cherty --------------

Cw-18 Dolomite ------ --- ---- - 

-aCw-19 Limestone ----- ---- --- -

Cw-20 Limestone, sandy------------ -

Cw-21 Limestone, cherty --------------

Cw-22 Limestone -------- --_____-___

Cw-23 Sandstone, calcareous -----------

Cw-24 Limestone ------------------- 

Cw-25 Dolomite, sandy, argillaceous ---

1.3

.9 

5.8

11.0 

9.8

1.2

5.5

5.0

18.0

14.0

32.

4.0 

5.

4.0 

15.

5.0 

5.0 

2.0 

5.0 

5.0

2.0

3.0

1.4

22.6

11.0
Wolverine Canyon, Idaho, lot 1322

Phosphatic shale member of Phosphoria formation sampled in a bulldozer trench in Wolverine Canyon, SEj NWi sec. 

County, Idaho. Beds strike north-south and dip 65* W. Section measured and sampled by R. A. Gulbrandsen, 

Cressman, and H. W. Peirce in June 1950. Samples analyzed for P^^S. an<* ac^ insoluble by U. S. Bureau of M

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

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet) P2°5

Chemical analyses (percent)

A12°3 Fe 2 03

Loss on 

ignition

Acid 

insolu

Rex chert member of Phosphoria formation lower bed only, base not exposed

R- 1 Limestone

Thrust and normal faults occur at 

Rex-phosphatic shale contact; thickness 

of missing strata unknown.

0.8 

Phosphatic shale member of Phosphoria formation top not exposed

P- 48 Phosphate rock 4840-HWP 

P- 47 Phosphate rock 4839-HWP

Bed P-47 is highly crumpled and 

weathered.

P- 46 Phosphate rock T 4838-HWP

P- 45 Limestone; fos. col. no. 12115 4837-HWP

P- 44 Phosphate rock, argillaceous - 4836-HWP

P- 43 Mudstone -- 4835-HWP 

P- 42 Limestone, argillaceous; fos. col.

no. 12114 4834-HWP 

P- 41 Phosphate rock, argillaceous - 4833-HWP 

P- 40 Phosphate rock, argillaceous ------- 4832-HWP

P- 39 Mudstone, phosphatic; fos. col. no.

12113 . 4831-HWP

P- 38 Phosphate rock, argillaceous -- - 4830-HWP 

P- 37 Phosphate rock, argillaceous -- 4829-HWP 

P- 36 Limestone, argillaceous - - ---- 4828-HWP 

P- 35 Phosphate rock, argillaceous -- 4827-HWP 

P- 34 Mudstone, phosphatic; fos. col. no.

12112 4826-BKR

P- 33 Mudstone, phosphatic - 4825-BKR 

P- 32 Phosphate rock, argillaceous and

mudstone - -- - 4824-BKR

Due to structural complications, the 

stratigraphic interval between beds 

P-31 and P-32 is unknown.

0.6 

1.4

1.0 

.7 

.8

1.2

1.0

.7

1.5

1.3

1.0 

.7 

.9 

.6

4.8 

3.7 

2.4

29.5

25.3

32. 5

2. 2

23.3

6.4

1. 2

19.9

19. 0

13. 8

17.3

24. 1

2.7

23. 2

12. 7

10.5

19.7

11.2

10.3

6.0

3.6

18.9

57. 

25.8

29.8

33.8

48.3

40. 5

22. 1

34. 

23.5

43.4

48.0

26.7
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

P- 11 

P- 10 

P- 9 

P- 8 

P- 7

P- 6 

P- 5 

P- 4

P- 3 

P- 2

P- 1

Mudstone, phosphatic, carbonatic; 

fos. col. no. 12111 

Phosphate rock, argillaceous,

Phosphate rock and argillaceous

nVirtQnHja to T*or*lr

"PHoQT^Hu to T*or*lr

T3Vi OQr^Hu to T*or*lr

"PHoQT^Hd to T*or*lr

T^HoctriVia to T*or*lr a ipcH 1 1n r*onn ct

Limestone (lens?) - -- - 

Phosphate rock - -- - ----- ---

Phosphate rock and mudstone.

Limestone, argillaceous; fos. col. 

no. 12109 

Phosphate rock; contains limestone

4 823 -RAG

4822- RAG 

4821 -RAG

4820 -RAG 

4819- RAG

4818- RAG 

48 17- RAG 

4816- RAG

48 15- RAG 

4814- RAG

4813- RAG 

4812- RAG 

4811-RAG 

4810- RAG 

4809- RAG

4808- RAG 

4807- RAG 

4806- RAG 

4805- ERG 

4804- ERG

4803- ERG 

4802- ERG 

4801- ERG 

4800- ERG 

4799- ERG

4798- ERG 

4797- ERG

4796- ERG 

4795- ERG 

4794- ERG

4793- ERG

1.3

3.0 

.9

.6 

1.3

1.8 

.5 

.8

1.0

.7

1.5 

.7 

1.7 

1. 1

.7

.7 

1.2 

1.6 

.7 

2.4

.8 

.4 

1.3 

1.0 

.5

2.0 

1.3

1.'9 

1. 1 

1.0

.8

1.6

12.6 

20.5

16.1 

5.9

23. 1 

11.8 

5.2

28.3 

3.7

27.9 

24.6 

1.5 

27.4 

20.1

3.0 

23.4 

26.3 

9.2 

13.4

.3 

16.4 

33.0 

29.6 

11.5

23.4

5.4

34.2 

36.2

37.4

24.3

4.35 

7.06 

3.23

2.29

2.77

2.83 

2.30 

.87 

2.84 

5.56

1.97 

4.04 

2.29 

1.54 

5.44

3. 15 

6.10 

.74 

2.29 

6.28

3.99 

2.35

1. 12 

.69 

.38

.40

1.52 

2. 19 

1. 10

.88 

.88

.90 

.96 

.27 

1. 15 

1.92

.75 

1.52 

.83 

.37 

1.81

1. 17 

. 18 

.54 

.73 

1.91

1.13 

.86

.55 

.44 

.35

.23

10.72 

11.99 

33.08

9.98 

36.36

11.66 

15.48 

43.41 

11.22 

10.96

38.86 

12.98 

12. 15 

32.61 

13.32

33.63 

13.82 

6.87 

9.16 

12.69

7.82 

30.60

6.01 

4. 10 

3.29

15.69

6.6

24.0 

13.2

15.7 

7.5

24.3 

46.3 

18.0

13.9 

15.2

11.7 

10.6 

4.3 

12.9 

24.7

9.7 

19.6 

14.6 

10. 

40. 

22.4 

39.7 

5.0 

12.9 

43.7

26.0 

17.9

5.2 

3. 

1.7

5.7

Wells formation top beds only

Cw- 1 

Cw- 2 Limestone, cherty - --- ---- -- --

4792- BKR 

4791- BKR

2.4 

2.6

0.7 

1.0 --

-- 27.8 27.8 

78.6

1 Fossil collection made by J. E. Smedley, U. S. Geological Survey.

Cumulative data incomplete due to missing information. 

** Note incompleteness of cumulative data.
Wolverine Canyon Continued

Bed 

no.

Cw- 3 

Cw- 4

Rock description

Sample 

no.

4790-BKR 

4789-BKR

Thickness 

(feet)

3.8 

2.3

Chemical analyses (percent)

P2°5

1.0 

.8

A12°3

--

Fe2°3

--

Loss on 

ignition

--

Acid 

insolu

68.9 

62.

o
Bear Creek, Idaho, lot 1353

Phosphatic shale and upper shale members of the Phosphoria formation sampled near Bear Creek, NEi sec« 31, T. 

Idaho, on the west limb of an anticline trending N. 35* W. and plunging southeast. Beds strike N. 70* W. and 

measured by R. P. Sheldon, T. M. Cheney, R. G. Waring, and M. A. Warner in August 1951. Samples analy

U. S. Bureau of Mines laboratory, Albany, Oreg., and for other constituents by Trace Elements Section labo

Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3

Fe 0 ! Losson 

* 62U3| ignition

Ac

inso

Dinwoody formation lower beds only

td-l 

-E-d-S 

l-d-2 

1-d-l

Mudstone, carbonatic; fos. col. no. 12535 -

--

70.5 

32.0 

13.0 

1.2

--

-- --

--

-

Upper shale member of Phosphoria formation

U- 3 

U- 2 

U- 1 6571 -MAW

0.9 

1.2 

.9 23. 8

-- __

""

__

--

28

Rex chert member of Phosphoria formation

R- 4 

R- 3 

R- 2 

R- 1

Chert; fos. col. no. 12536 - _________

Covered interval; rocks probably faulted- --

--

24.0

(?) 

2.3

1.4

-- -- -- --

-

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

T-^Vir*c_TiViJ5 to Y*f^r*lr* "FrtQ r*ol no 1 ^' i'^-t ___.

Phosphate rock and mudstone; fos.

r>ol nr» 17^^d. _________________________

6567-MAW 

6566-MAW 

6565-MAW 

6564-MAW 

6563 -MAW

6 562 -MAW 

6561 -MAW

6560 -MAW 

65 59 -MAW 

6558-MAW

6 5 57 -MAW 

6556-MAW

0.6 

2.3 

1.0 

1.9 

1. 1

1.6 

1.3

1.2 

1.4 

.3

.6

1.3

31. 1 

29.5 

35.4 

35.8 

34.2

35.4 

35.6

24.2 

34.8 

31. 5

12. 2 

.3. 7

0. 82 

1.94 

.57 

.88 

. 72

.23 

.30

3.78 

.56 

1.80

0.70 

.90 

.68 

.46 

.51

. 15 

.25

1.70 

.30 

1.28

10.33 

9.41 

7. 72 

9.07 

8. 65

5.85 

7. 89

4.03 

11.04 

11. 52

15

13

6

5

3

2

2

30

4

11

57

79

1 Fossil collection by J. E. Smedley, U. S. Geological Survey.
Bear Creek Continued

Bed 

no.

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

KP-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

Rock description

Mudstone - - - 

Mudstone, phosphatic - - 

Mudstone, phosphatic - - 

Phosphate rock, argillaceous and

"pVinQnVin f^ T*fir*lf

Mudstone -- - - - -- -

Mudstone - --- ---- - - -

Mudstone -- - --- - -

"Plirtttffclm to Y» nr» lr Q T*eri 1 1 Q c*c*nii c

"PHn^nHa to T*rtr*lf 9 Y*Cfl 1 In OOrtll Q

Mudstone, phosphatic and mudstone-- 

"PHnQnHa to T*rtr*lr a f»cfi 11 a i^onnc .._ _

"PhrtQnHa to T*rtr*lf 9 Y*Cf1 llQ^O^IIQ _ _ . «

"Plif^Qnlus to T*c%f*\F a T»cH lino of^ii Q

"PHncinVia to T*nr*lr ... _ _

Sample 

no.

6555-MAW 

6554-MAW 

6553-MAW 

6552-MAW 

6551 -MAW

6 550 -MAW 

6549- RGW 

6548- RGW 

6547- RGW 

6546- TMC

6545-TMC 

6544- TMC 

6543- TMC 

6542- TMC 

6541 -TMC

6540 -TMC 

6539- TMC

6538- TMC 

6537- TMC 

6536- TMC

6535- TMC 

6 534 -TMC 

6533- TMC 

6532- TMC 

6 531 -TMC

6530- TMC 

6 529 -TMC 

6528- TMC 

6527- TMC 

6526- TMC

6525- TMC 

6524- RPS 

6523- RPS 

6522- RPS 

6521- RPS

6520- RPS 

6519- RPS

Thickness 

(feet)

0.5 

.5 

.7 

1.0 

2.0

2.6 

.9 

.5 

1.5 

1.3

1.6 

.6 

1.2 

1.3

.5

.7 

.4

.7 

.7 

1.3

.9 

1.2 

1.0 

.7 

.5

.8 

.7 

.7 

.4 

.7

.4 

.5 

1.0 

.9 

.6

.9 

1.3

Chemical analyses (percent)

P2°5

24.8 

4.1 

21.7 

10.0 

.3

5.8 

1.0 

4.5 

.4 

7.7

5. 1 

6.6 

3.0 

14. 1 

5.9

13.7 

9.4

17. 5 

8.4 

14.6

28.4 

26.8 

3.4 

2.9 

7.5

5.0 

10.0 

13.0 

4.9 

19.2

19.3 

12.2 

24.8 

22.8 

20.4

18.4 

27. 1

A12 03

5.48

5.44 

8.60 

3.70 

4.94 

6.64

5.80 

2.60

Fe2°3

2.29

2.36 

3.18 

1.50 

1.70 

2.18

2.65 

1.29

Loss on 

ignition

11.96

11.23 

14.54 

9.83 

10.02 

10. 12

12.36 

9.40

Ac

insol

23

74

26

48

76

68

82

75

84

55

54

64

78

44

71

43

61

35

47

35

9

12

77

78

56

69

46

40

57

27

28

40

17

22

27

30

11
P-12 

P-ll 

P-10 

P- 9 

P- 8

P- 7 

P- 6 

P- 5 

P- 4 

P- 3

P- 2 

P- 1

6518- RPS 

6517- RPS 

6516- RPS 

6515- RPS 

6514- RPS

6513- RPS 

6512- RPS 

6511- RPS 

6510- RPS 

6509- RPS

6508- RPS 

6570- RPS

1.0 

1.0 

.8 

1.4 

1.0

.3 

1.8 

1.6 

1.0 

1.3

.4 

2.0

22.6 

25.2 

7.0 

27.2 

32.8

26.5 

31.5 

.9 

31. 2 

5.0

31. 7 

1. 7

5.10 

3.84 

8.92 

2.64 

1.14

3. 74 

. 72 

8.48 

.74 

6.48

.80

2.20 

1.60 

3.43 

1.37 

.84

1.30 

.60 

3.83 

.56 

3. 18

.73

8.97 

7.45 

8.85 

8.49 

4.61

7.28 

4.27 

6.73 

5.82 

8.73

5.68

21

19

64

6

4

15

9

83

6

69

6

36

Wells formation upper beds only

Cw-24 

Cw-23

Cw-22 

Cw-21

Cw-20

Cw-18

Cw-17 

Cw-16 

Cw-15

Cw-14 

Cw-13 

Cw-12 

Cw-11 

Cw-10

Cw- 9 

Cw- 8 

Cw- 7 

Cw- 6 

Cw- 5

Cw- 4 

Cw- 3 

Cw- 2

Cw- 1

Carbonate rock, sandy; fos. col.

flUo A £ -*-/ ji «*

Chert, phosphatic, and cherty phosphate

Chert, siltstone, and cherty, carbonatic

Chert---- ---- _ ..... _ ................

Mudstone, cherty, argillaceous carbonate 

rock and chert - .... . ....

C arbonate rock .....

Sandstone, cherty, carbonatic and

Sand stone carbons. tic ... . .

QQ ndst one .... .... .. . HHHHH 

f^MSS Vf'yi'fc* f*£l t^hrtflQ 4"! f*

6569- TMC 

6568- TMC

2.7

.5 

3. 1

3.9 

.5

3.0

1.2 

.5 

22.0 

10.0

12.0 

52.0 

13.0 

39.0

9.0

9.0 

42.0 

20.0 

3.0 

47.0

12.0 

15.0 

10.0 

25.0

8.8 

8. 1

--

--

61

66
Fort Hall Indian Reservation, Idaho, lot 1349

Upper portion of phosphatic shale member of Phosphoria formation sampled in bulldozer trench of the Westvaco Chem

Machinery and Chemical Corporation, on Fort Hall Indian Reservation, sec. 23(?), T. 4 S., R. 37 E., Bingha

strike N. 50° W. and dip 25" SW. Section measured and sampled by M. A. Warner and R. A. Smart in July 19

by Trace Elements Section laboratory, U. S, Geological Survey, Denver, Colo.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses 

(percent)

P2°5

Acid 

insoluble

Cumulative 

thickness 

(feet)

Rex chert member of Phosphoria formation basal bed only

R- 1 IVludstone chex*tv «.«.««.«.«.

' J

-- 2, 5 -- -- 2.5

Phosphatic shale member of Phosphoria formation upper part only

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

IVEudstone 

TVTn rf^t nni^ 53nH mantle «.«.» _»_«. «. «.»«. . . .

IVTudstone 

Beds P-64 through P-67 badly weathered 

and slumped.

M d t

Beds P-59 through P-61 badly weathered.

TV/Til H ct ono r^Vi OQT*VIQ ti i** . _ _ _«.

"PVi ocnlisj t^ T*or*lr a Y*cfi 1 1 Q f^oon c _ » . .

IVIucistoriG phosohcitic 

Bed P-49 (sample 6321 -MAW) correlates 

with bed P-49 (sample 2720-WOM) of 

lot 1269.

6337- RAS 

6336- RAS

6335- RAS

6334- RAS 

6333- RAS 

6332- RAS 

6331 -MAW

6330-MAW

6329-MAW 

6328-MAW 

6327-MAW 

6326-MAW 

6325-MAW

6324-MAW 

6323-MAW 

6322-MAW 

6321 -MAW

0.6 

11.5 

1.8 

2.6

1.6

1.5 

3.5 

2.5 

2.3

.6

2.8 

.6 

2.1 

1.5 

2.6

3.0 

1.1 

.6 

1.5

18.9 

5.25

1.40

28.0 

6.80 

7.65 

20.0

29.5

8.15 

26.8 

18.0 

10.8 

15.4

17.0 

32.8 

6.85 

33.0

42. 1 

73.0

84.7

16.3 

72.3 

70.6 

37.4

16.8

66.5 

23.7 

42.0 

58.7 

44.2

44.4 

9. 14 

72 0 0 

11.8

0.6 

12. 1 

13.9 

16.5

18. 1

19.6 

23.1 

25.6 

27.9

28.5

31.3 

31.9 

34.0 

35.5 

38.1

41. 1 

42.2 

42.8 

44.3

1 See O'Malley and others, 1953.
Snowdrift Mountain, Idaho, lot 1372

Phosphatic shale member of Phosphoria formation measured and sampled on Snowdrift Mountain, NW^NWi, sec. 8, T

Idaho, on the east limb of the Georgetown syncline. Beds strike N. 20° E. and dip 65° W. Section measured a

A. Peterson, R. G« Waring, R. A. Smart, and E. R. Cressman in September 1951. Samples analyzed for P,Ov 

of Mines laboratory, Albany, Oreg., and for other constituents by Trace Elements Section laboratory, U. St G

Bed

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P °

25

A12°3

Loss on 

ignition

Acid 

insolub

Rex chert member of Phosphoria formation basal bed only

R- 1 .Chert and mudstone 6775- JAP 2,6 2.3 75.3 

Phosphatic shale member of Phosphoria formation

P-156 Phosphate rock, argillaceous ----- ___- 6774- JAP

P-155 Mudstone - 6773- JAP

P-154 Mudstone r 6772- JAP

P-153 Mudstone; fos. col. no. 12595 6771- JAP

P-152 Mudstone; fos. col. no, 12595 6770- JAP

P-151 Mudstone 6769- JAP

P-150 Mudstone, carbonatic 6768- JAP

i '

01 Bed P-150 highly weathered.

P-149 Mudstone; fos. col. no. 12594- - 6767- JAP

P-148 Mudstone 6766- JAP

P-147 Mudstone, phosphatic -- 6765- JAP

P-146 Phosphate rock -- -- 6764- JAP

P-145 Mudstone; fos. col. no, 12593--- 6763- JAP

P-144 Mudstone 6762- JAP

P-143 Phosphate rock 6761- JAP

P-142 Phosphate rock 6760-JAP

P-141 Phosphate rock-- -- 6759- JAP

P-140 Mudstone 6758- JAP

P-139 Phosphate rock and mudstone - 6757-ERG

P-138 Phosphate rock, argillaceous - 6756-ERG

P-137 Phosphate rock -- -- 6755-ERG

P-136 Phosphate rock 6754-ERG

.P-135 Phosphate rock 6753-ERC

P-134 Phosphate rock, argillaceous - - 6752-RGW

P-133 Phosphate rock, argillaceous and

	phosphatic mudstone- -- - 6751-RGW 

P-132 Phosphate rock - 6750-RGW

0.5 

.8 

1.0 

1.9 

6.0

6.2

1.2

1.4

2. 1

.6

2.0 

. 7

1.0 

.5

.9 

1.6 

1. 1 

1.9

.8

1.7 

.9 

.6

,6

29.5 

2.4 

7.3 

1. 2 

1.6

3.6 

6.5

6.4 

1.8 

9.3

30.9

1.5

2.7

36.2

35.7

34.7

4.4

23.4

27.4

32.0

33.6

30.3

17. 7

23.4

34.6

0.49 

.98

.95

10.24

4.84

3.63

2.02

1.80

2.74

7.04

5.92

1.67

0.37 

.53

.55

3.43

1.81

1.24

.88

.75

1.24

2.23

1.56 

.65

5.52

4.41

5.58

6.04

5.45

5.68

4.81

5.28

6.22

6.92

7.44

4. 11

21.3

75.5

60.8

81.4

78.5

73.0

53.4

68.9

80.7

51.0

12.6

80.4

73.4

2.5

2.8

71.1

28.2

20.6

10.0

6.6

13.3

40.6

26.5 

6.3

1 Fossil collection made by J. E. Smedley, U. S. Geological Survey.
Snowdrift Mountain Continued

Bed 

no.

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-H5 

a>P-ll4 

P-113 

P-112

P-lll 

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 

P- ?4

Rock description

Phosphate rock 

Phosphate rock, argillaceous - 

Mudstone, phosphatic _______

Phosphate rock, argillaceous --

Mudstone, phosphatic - ___-- _

Phosphate rock, argillaceous ---------- 

Mudstone - - - --_

Mudstone, phosphatic - - -

Phosphate rock, argillaceous _______

Mudstone, phosphatic; fos. col. no. 

1?.5Q?.. _____________________ _ ___ _ _ _

Mudstone, phosphatic - _______

Mudstone - - 

Phosphate rock, argillaceous and

Phosphate rock, argillaceous - 

Mudstone, phosphatic and mudstone -

Mudstone -

Mudstone 

Mudstone, pho phatic; fos. col. no. 

12591 _ - _ - _ _ -_ _ _ ______ _ ____

Sample 

no.

6749 -RGW 

6748-RGW 

6747-RGW 

6746-RGW 

6745-RGW

6 744 -RGW 

6743-RGW 

6742-RGW 

6 741 -RGW 

6 740 -RGW

6739-RGW 

6738-RGW 

6737-RGW 

6736-RGW 

6735-RGW

6734-RGW 

6733-ltGW 

6732-RGW 

6731 -RGW 

6730-RGW

6729-RGW 

6728-RGW 

6727-RGW

6726-RGW 

6725-RGW

6724-RGW

6723-RGW 

6722-RGW 

6721 -RGW 

6720-RGW

6719- RAS 

6718- RAS 

6717- RAS 

6716- RAS 

6715- RAS

6714- RAS 

6713- RAS 

6712- RAS

Thickness 

(feet)

0.8 

.8 

.8 

.7 

1.1

1.4 

1.4 

1.2 

1.5 

.8

1.3 

.7 

1.7 

1.0 

.8

1.6 

.7 

1.5 

.6 

1.3

.6 

1.3 

.7

1.4 

1.8

1.4

1.0 

.6 

1.9 

2.5

1.3 

1.7 

.9 

3.3 

.7

1.3 

.5 

.6

Chemical analyses (percent)

P2°5

29.9 

36.7 

36.6 

34.5 

26.9

31.6 

28.5 

26.5 

25.8 

23.6

18.6 

11.7 

5.3 

12.4 

14.9

19.6 

11.4 

18.6 

15. 7 

26.9

3.2 

7.8 

23.6

12.7 

8.7

5.6

13.5 

22.8 

8. 1 

3.8

7.4 

5.5 

2.2 

3.3 

15.7

8.4 

10.3 

18.3

A12°3

3.66 

.78 

1. 18 

1.74 

4.44

2.27 

3.10 

3.88 

4.72 

4.30

Fe2°3

1. 18 

.40 

.53 

.75 

1.38

1.04 

1.40 

1.20 

1.39 

1.65

Loss on 

ignition

5.37 

4.95 

5.49 

5.75 

10.98

14.79 

10.72 

11.88 

12.76 

14.39

Aci

insolu

14.

1.

2.

7.

16.

8.

12.

15.

16.

19.

30.

50.

68.

47.

34.

34.

54.

38.

43.

19.

80.

69.

25.

55.

64.

69.

48.

30.

59.

76.

58.

67.

78.

72.

35.

64.

47.

32.
P- 93 

P- 92

P- 91 

P- 90 

P- 89

P- 88 

P- 87 

P- 86 

P- 85 

P- 84

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

Phosphate rock----- _--_----__ ---_

Phosphate rock, argillaceous and 

phosphate rock -- _________ ____

Mudstone ---------- __-------__-_--__

Phosphate rock, argillaceous, cherty; 

fos. col. no. 12590- ---- ----

Mudstone, phosphatic -------- --------

Phosphate rock, argillaceous,

Mudstone and calcareous, argillaceous

X A.lWh9fl.lCl k^ J. WrA

J. 1 1. V -7 £-* _J,CL tt. J. WV*A.j d J. gXJ.J.O.^>^> VSU._7

Phosphate rock, argillaceous; phosphatic

Phosphate rock, argillaceous and

Mudstone, phosphatic, mudstone and

31.5

19.9

14. 1

11.3

21.9

4.2 

1.3 

9.6 

2.7

22. 7

9.5

19.3

3.0

12.9

15.4

18.6

6.3

22.3

11.3

15.9

9.4 

12.9

16.3

9.5

16.8

14.7 

11.6 

2.6 

.5 

.3

2.4 

3.9 

4.4 

2.2 

12.4

18.7 

1 Cumulative data incomplete because of missing information. Computations start from zero after interruption.

6711- RAS

6710- RAS 

6709- RAS 

6708- RAS 

6707- RAS

6706- RAS 

6705- RAS 

6704- RAS 

6703- RAS

6702- RAS

6701- RAS 

6700- RAS 

6699- RAS 

6698-TMC

6697-TMC

6696-TMC 

6695-TMC 

6694-TMC 

6693-TMC 

6692-TMC

6691 -TMC

6690-TMC

6689-TMC 

6688-TMC

6687-TMC

6686-TMC 

6685-TMC 

6684-TMC 

6683-TMC 

6682-TMC

6681 -TMC 

6680-TMC 

6679-TMC 

6678-TMC 

6677-TMC

6676-TMC

.5

.5 

.4 

.4 

.7

1.8 

3.5

.5 

.9

.8

.9 

.4 

2.2 

.7

1.0

.5 

1.0 

.7 

.7 

.5

.6

1. 1

.7 

.8

.5

.8 

2.2 

2.0 

3. 1 

1.2

1.6 

2.2

4.5 

2.0 

1.9

.7

8

26

47

54

32

79

18

64

82

32

64

33

77

38

28

26

64

18

45

38

52

38

33

42. 

55

39. 

45

71

92

88

74

69

70

71

48

35
Snowdrift Mountain Continued

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

00

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

Rock description

Mudstone, phosphatic - -- 

"PVirtcnVijit ^ f**"ir*lr 9 T*CTI 1 1 a f*^fMi Q

PHn^fVhat^ t*nf*lr ar*cfi 1 1ar*^niiQ _

Phosphate rock, argillaceous,

Phosphate rock, argillaceous and

f*a 1 oa T*O fkiic mnr?6t rtno

Phosphate rock, argillaceous and 

phosphatic mudstohe; fos. col. no. 12589 - 

Mudstone -- --- -------- - --

Mudstone, phosphatic and mudstone ---

Phosphate rock, argillaceous -- - 

Phosphate rock, argillaceous and

Mudstone, phosphatic - ----

Mudstone, phosphatic - - -- - -

Phosphate rock; fos. col. no. 12558 --- --

Sample 

no.

6675-TMC 

6674-TMC 

6673-TMC

6672-TMC 

6671 -TMC

6670-TMC 

6669-TMC 

6668-TMC 

6667-TMC 

6666-TMC

6665-TMC 

6664-TMC 

6663-TMC 

6662-TMC 

6661 -TMC

6660-TMC 

66 59 -TMC 

6658-TMC 

6657 -TMC 

6656-TMC

6655-TMC 

6654-TMC 

6653-TMC 

6652-TMC 

6651-TMC

6650-TMC 

6649-TMC 

6648- JAP 

6647- JAP 

6646- JAP

6645- JAP 

6644- JAP 

6643- JAP 

6642- JAP 

6641- JAP

6640- JAP

Thickness 

(feet)

1.7 

.8 

1.0

.5 

.5

1.1 

.7 

.9 

1.2 

.9

.5 

1.0 

2.6 

.9 

.7

1. 1 

.6 

.5 

1.3 

.8

1.1 

.7 

.4 

.7 

.6

.6 

.6 

2.0 

3.0 

2.5

1.2 

1.0 

2.9 

1.8 

1.9

3.5

Chemical analyses (percent)

P2°5

9.4 

20.2 

20.8

17. 7 

17. 1

17.5 

7.6 

13.6 

14.4 

19.2

19. 1 

16.7 

12.4 

13.1 

21.9

19,1 

23.4 

25.2 

25.0 

24.6

31.2 

25.5 

3.5 

23.7 

26.4

21.8 

24.8 

12.7 

11.2 

7.6

21.5 

29.6 

27. 1 

23.2 

12.6

27.3

A12 03

6.08

6.92 

4.48 

3.80 

4.20 

4.08

1.65 

3.72 

7.70 

3.22 

2.54

4.04 

3.33 

7.20 

8.94 

9.22

3.62 

2.14 

2.76 

4.36 

7.76

2.60

Fe2°3

2.02

1.30 

1.73 

1.20 

1.58 

1.62

.90 

1.64 

4.34 

1.77 

1.43

1.65 

1.28 

2.35 

2.84 

3.38

1.28 

.78 

.64 

1.45 

2. 12

.95

Loss on 

ignition

11.78

11.25 

14.82 

12.80 

12.57 

9.36

10.55 

9.59 

25.43 

13.74 

12.20

11.56 

10. 14 

8.98 

7.89 

6.74

5.89 

6.89 

8.39 

6.86 

6.85

7. 22

Aci

insolu

59. 

30. 

27.

29.

33.4

37. 

65.

45.9 

42.5 

30.5

29.7 

34.5 

46.6 

47.3 

25.4

32.2 

18.7 

14. 

16.7 

21.1

6.9 

18.9 

47.1 

18.1 

11.4

25.3 

20. 

52.9 

53.5 

64.8

29.5 

15.2 

18.1 

28.4 

52.9

19.3
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

Phosphate rock-------------

Phosphate rock--- --------

Phosphate rock--- - --- 

Phosphate rock, argillaceous 

Phosphate rock-------- ---

Muds tone, phosphatic ----- --- --- 

Phosphate rock, argillaceous; fos. col.

no. 12587 

Phosphate rock, argillaceous and

phosphatic mudstone -------- -----

Phosphate rock ----- _-_-__------ 

Phosphate rock ------ ___-__-----

Phosphate rock---------

Phosphate rock- -- 

Phosphate rock ---- 

Limestone, argillaceousLimestone, argillaceous 

Limestone, argillaceous-- - -- --- 

Phosphate rock --- _-_--_-__--- -. 

Limestone --- -------- _-__-_-____.

Phosphate rock, calcareous; fos. col.

no. 12585 - 

Dolomite, argillaceous; fos. col. no. 12584-

Phosphate rock; fos. col. no. 12583

6639- JAP 

6638- JAP 

6637- JAP 

6636- JAP 

6635- JAP

6634- JAP 

6633- JAP

6632- JAP 

6631- JAP 

6630- JAP

6629- JAP 

6628- JAP 

6627- JAP 

6626- JAP 

6625- JAP

6624- JAP 

6623- JAP 

6622- JAP

6621- JAP 

6620- JAP

6619- JAP

.6

.8

2.2

2.1

.6

.7 

2.7

1.4 

.9 

.9

1.5 

1.5 

2.2 

2.6 

2.0

2.0 

.5 

.9

.7 

1.2

.7

28.8

29.5

28. 1

21.7

30.6

11.5

23.3

17.7

32.6

33.7

33.4

34.9

32.3

1.0

.4

33.8 

1.2

29.4 

.7

32.3

2.22

2,04

2.52

4.86

3. 10

8.34 

.92

5.72

1.70

1.00

1.03

.46

1.19

.59 

.60 

.74 

1.30 

.93

1.88

1.20

2.22 

.53 

.33

.37 

.50 

.69

7.95

7.80

7.05

7.77

6.37

7.43

5.97

5.94

6.56

7.04

7.42

6.34

5.89

15

14

17. 

30. 

15

50

27

39

6.

3.

3.

2.

6.

38.

34. 

45.

6.

2.

4. 

27.

6.

Wells formation not measured

Cw-1

**Note incompleteness of cumulative data.
Mud Spring, Idaho, lot 1351

Phosphatic shale member of Phosphoria formation measured and sampled near Mud Spring, sec. 7, T. 12 S., R. 29 

Idaho. Beds strike N. 75* W. and dip 30* S. Section measured and sampled by T. M. Cheney, R. A. Smart, 

M. A. Warner in July 1951. Samples analyzed by Trace Elements Section laboratory, U. S. Geological Surv

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses 

(percent)

P2°5

Acid 

insoluble

Cumulativ

thickness 

(feet)

Rex chert member of Phosphoria formation lower part only

R-13

R- 1 ?

R- 1 1

R- 1 n

R_ Q

R

Q

R

_ -7

R

f.

R_ a

R - &.

R- 3

R_ ?

R

_ i

Mudstone; fos. col. no. 12642 made 3.5 

fggt hiffher 

Mudstone----- - - - -

Mudstone-- - - - - - -- 

Mudstone-- - -- -- - -

Mudstone- - ---- - - -

Mudstone- - -- - -

1.4

2.1

7.3

5.6

3.0

3.5

5.6

5.0

4.6

0 L

3

Q

2.9

 \ o

"

1.4

4.1

11.4

17.0

20.0

23.5

29.1

34.1

1Q "7

46.1

49.0

at Q

Phosphatic shale member of Phosphoria formation

P-47

P-46

P-45

P-44

P-43TCta/

P-42

P-41

P-40

P-39

P

_-3 Q 

 JO

P-37

Mudstone, phosphatic ---------------------

Mudstone------- ---- _____________

Mudstone-- --- --- - - - --

Mudstone-- - -- - - - - - -

Mudstone-- --- -----------------------

Mudstone and argillaceous phosphate rock --

Mudstone, phosphatic -------------------

Beds P-41 through P-45 highly crumpled,

slumped, and weathered. Thicknesses

are only approximate.

Mudstone--- - - - - -

Mudstone, phosphatic---- ---- --_ ____

Mudstone, phosphatic---- ---- ______ _

Mudstone, phosphatic; fos. col. no. 12641 ___

6454- RGW

6453-RGW

6452 -RGW

6451 -RGW

6450- RGW

6449 -RGW

6448- RGW

644 7 -RGW

6446 -RGW

6445- RGW

6444 -RGW

1.4

.9

2.0

2.0

2.0

1.0

1.0

5.2

2.3

2.4

1,4

10.2

6.95

3. 10

2.65

4.50

10.8

11.6

4.85

9.50

10.4

9.65

52.6

Z -y 0

O_.. 0

75. 1

79.1

73 2 I -J « b

59.2

57.4

n

o 

. o

58.7

57.2

58.7

1.4

? 3 £< _*

4.3

6.3

8 7

. -3

9.3

10.3

15.5

17.8

20.2

21.6
P-36 Mudstone, cherty, phosphatic-- 6443-RGW

P-35 Mudstone 6442-TMC

P-34 Mudstone and chert; fos. col. no. 12639 6441-TMC

P-33 Mudstone 6440-TMC

P-32 Phosphate rock, argillaceous; fos. col.

	no. 12640 6439-TMC

P-31 Phosphate rock 6438-TMC

P-30 Phosphate rock, argillaceous - - 6437-TMC

P-29 Mudstone, phosphatic and argillaceous

	phosphate rock--- __-__ - 6436-TMC 

P-28 Mudstone, phosphatic --- -- -- - 6435-TMC 

P-27 Phosphate rock, argillaceous 6434- RAS

P-26 Mudstone, phosphatic ---- 6433- RAS

P-25 Mudstone, phosphatic -- 6432- RAS

P-24 Mudstone, phosphatic - 6431- RAS

P-23 Mudstone 6430- RAS

P-22 Mudstone 6429- RAS

P-21 Mudstone 6428-RAS

P-20 Mudstone 6427- RAS

P-19 Mudstone 6426-RAS

P-18 Mudstone 6425-MAW

	Beds P-18 and P-19 highly weathered.

CO

*-* P-17 Mudstone, phosphatic 6424-MAW

P-16 Mudstone 6423-MAW

P-15 Mudstone 6422-MAW

P-14 Mudstone 6421-MAW

P-13 Phosphate rock ---- 6420-MAW

P-12 Phosphate rock, argillaceous -- 6419-MAW

P-ll Mudstone, phosphatic 6418-RAS

P-10 Phosphate rock, argillaceous - ---- 6417- RAS

P- 9 Phosphate rock, argillaceous -- -- -- 6416- RAS

P- 8 Phosphate rock, argillaceous - -- 6415- RAS

P- 7 Phosphate rock - 6414-RAS

P- 6 Phosphate rock, argillaceous - --- 6413- RAS

P- 5 Mudstone, phosphatic - - 6412- RAS

P- 4 Mudstone; fos. col. no. 12638 6411- RAS

P- 3 Phosphate rock, argillaceous; fos. col.

	no. 12638 - 6410- RAS 

P- 2 Mudstone, phosphatic --- - 6409- RAS

P- 1 Mudstone and phosphate rock; fos. col.

	no. 12637 6408- RAS

1.9

2.2

.6

2.0

2.0 

1.4

1.0 

2.2 

2.0

1.0

1. 1

.8

3.2

2.5 

1.4 

1.0 

2.2

3.5

4.0 

4.0 

3.9 

1.0 

1.5

5.2

1.1

.9

.6

.6

.8

1.0

.7 

1.3

.9

9.05

7.50

7.20

5.70

21.8

28.4

23.3

19.2

10.4

19.5

16.4

9.35

10.0

7.75

2.20

4.90

2.20

6.50

.75

9.15

6.75

1.80

.95

32.3

26.0

9.40

19.9

30.1

21

28.2

27. 1

11.9

.90

19.7

12.8

28.0

62.1

69.0

66.1

70.0

33.0

17.6

32.5

42.2

64.4

40.4

46.2

66.8

64.1

71.6

86.7

78. 1

86. 1

71.1

84.8

61.9

70.5

88.7

92.0

15.9

26.6

63.9

38.3

15.7

33.8

18.9

23.4

57.0

93.6

42.8

55.6

24.9

23.5

25.7

26.3

28.3

29.2

31.2

32.6

33.6

35.8

37.8

38.5

39.5

40.6

41.4

44.6

47.1

48.5

49.5

51.7

55.2

59.2

63.2

67.1

68.1

69.6

74.8

75.9

76.8

77.4

78.3

78.9

79.7

80.7

81.4

82.7

83.6
Mud Spring Continued

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses 

(percent)

P2°5

Acid 

insoluble

Cumulativ

thickness 

(feet)

Wells formation

Formation present but not measured; fos. 

col. no. 12636 taken 37 feet below bed P-l; 

fos. col. no. 12635 taken 83 feet below 

bed P-l.

to

INT.-DUP. SEC., WA