GEOLOGICAL SURVEY CIRCULAR 906

STRATIGRAPHIC SECTIONS OF THE 

PHOSPHORIA FORMATION IN 

IDAHO, 1949, PART 2

This report us 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 

Doug as McKay, Secretary

GEOLOGICAL SURVEY 

W. E Wra her, Director

GEOLOGICAL SURVEY CIRCULAR 305

STRATIGRAPHIC SECTIONS OF THE PHOSPHORIA FORMATION

IN IDAHO, 1949, PART 2

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

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., 1953

Free on application to the Geological Survey, Washington 25, D. C.
STRATIGRAPHIC SECTIONS OF THE PHOSPHORIA FORMATION

IN IDAHO, 1949, PART 2

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

CONTENTS

Lot no. Page

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

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

Stratigraphy of the Phosphoria.

formation in southeastern Idaho .... 4

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

Selected bibliography ............... 4

Tables of Stratigraphic

sections

Reservoir Mountain............ 1313 5

Lot no. Page

Tables of Stratigraphic 

sections Continued

Rocky Canyon.................. 1304 9

Spectrographic analyses ... 13 

Gravel Creek Divide............ 1308 16

Corral Creek.................. 1315 19

Henry......................... 1309 20

Enoch Valley .................. 1314 24

Ballard trench ................. 1316 28

ILLUSTRATIONS

Page

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

2. Generalized section of the Phosphoria formation at Trail Canyon, Idaho, lot no. 1206. ............ 3

INTRODUCTION

The U. S. Geological Survey has recently measJired and sampled the Phosphoria formation at many 

localities in Idaho and other western states. These 

data will not be fully synthesized and analyzed for 

several years, but segments of the data, accompanied 

by little or no interpretation, are published as preliminary reports as they are assembled. This is the fifth 

report of data containing abstracts of sections measured 

in southeastern Idaho (fig. 1); it includes about half the 

data gathered in Idaho in 1949. The field and laboratory 

procedures adopted in these investigations are described 

rather fully in a previous report (McKelvey and others, 

1953a).

Many people have taken part in this investigation, 

which was organized and supervised by V. E. McKelvey. 

,F. J. Anderson, A. L. Bush, R. S. Jones, K. B. Krauskopf, 

K. Lutz, M. E.' Thompson, R. G. Waring, and 

M. A. Warner participated in the description of strata 

and the collection of samples referred to in this report. 

T. K. Rigby assisted in the preparation of trenches 

and the collection, crushing, and splitting of samples 

in the field. The laboratory preparation of samples 

for chemical analysis was done in Denver, Colo. , 

under the direction of W. P. Huleatt.

The PzOf, 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 AlzOa, FezOs, and loss-on-ignition analyses were 

made in the Trace Elements Section laboratory of the 

Survey in Washington, D. C., under the direction of 

J. C. Rabbitt, by chemists H. Alberty, I. Barlow, 

A. Caemmerer, N. Guttag, C. Hoy, J. J. Rowe, and 

W. P. Tucker, and the spectrographic analyses were 

made in this laboratory by C. L. Waring and H. Worthing.

The data were compiled largely by K. S. Bergman 

under the supervision of R. W. Swanson. Organization 

of the tabular data was by Anita Wise.

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 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.;andG. A. 

McHugh and H. B. Fowler of the Simplot Fertilizer Co. 

have been especially helpful in this connection.
5T a'20»£T277-8>l ll fc,303 l

nr%^jj/°''i

^r^.. 2 o8\% ////r2fr8 ,

Outcrop of Phosphoria formation, 

dotted where questionable

Location and lot number of sample 

locality included in this report

0 1262

Location and lot number of sample 

locality to be included in other reports

MONTPELIER

Recompiled and modified from Clabaugh, 1946

112° 111

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

2
PE

3 

0

50 

100 

150 

ZOO 

250 

300 

350 

400

Pt

44O

:ET

0

v

MMCI

20

I

li

[NT

10

I

^

§!§§§§§§§

wm

0 LlTHOLOay

\

\

\ 

\

1

1

^^

I

 H

1

11

11

^

i

i\ i ; *

r »**'

 a. t. 

t~ x ± jf

JL

JL

THICK- ** "r" DE3CRIPTIOM

IM"«ET PMCMIT Phosphoria formation

JL

uc

', JC XL It

- -x-^*~ * 

-I JCL JT

r v x i

I JC JL

_X v Jf

'"*" ^ T 

A .i.

L-_l_ _J_ r~*~i \~

JL 

IiZj_ 

_L!

r :>c x

L_ Jt JT

Jf JT

. 

 fTff

Tp

Vp

- -

^ -_ 

_2

L

A

JL

/ 

/

/

^\

/

/ ^

/

=-\// /

_____

_ 

\ 3l_ t-X-

-r4 r1 r

 .

'-I'-i

 \ t^

X V 

1 , » '

 

2

H^

\///

/ /

/ 

/

/,

y

46

32

68

82

I

n 

n

22

28

3

5

5

16

2

\S

IS

4

19

2

14

3

2

3

15

7

4

2

1

1

1

1

19

2 

22

14

6

13

2

12

4

14

4

8

1

6

3

17

5

11

4

25

33

2

30

Upper shale member (not exposed)

Rex chert member (top pot exposed) 

Chert: hard, black, thin-bedded

Mudatone: hard, black, thin-bedded

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

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

dark-gray, massive limestone

Phosphatic shale member

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

omphalotrochus gastropods

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

Phosphate rock: argillaceous, oolitic, pisslitic, medium-hard, brownish-gray to 

black, thin-bedded; contains a few limestoae concretions

Mudstone 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

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

contains phosphatic aoduies in middle 12 feet

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

Mudstone; hard, browaish-gray, thick-bedded.

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

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

joints

Mudstone: phosphatic, nodular, oolitic, medium-hard, brownish-gray to blrclc, 

thin-bedded

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

Mudstone: phosphatic, oolitic, soft, brownish-black to black, thia-bedded; contains many limestone lenses

Limestone: hard, medium-gray, massive; contains black chert lay era 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-Mack, 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* limestone

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 white 

(tabular) fossil fragments

Veils formation

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

3
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; another member, a thinbedded cherty mudstone 15 to 75 feet thick, overlies 

the Rex chert member in most of southeastern Idaho 

a.nd western Wyoming, although it is not well defined 

at the type locality.

The Phosphoria formation overlies the Pennsylvanian Wells formation and underlies the Triassic 

Dinwoody formation. The upper 50 to 75 feet of the 

Wells formation consists of gray fossiliferous cherty 

limestone that contains some thin phospnatic layers. 

It may be the correlative the lowermost member 

(A. member) of the Phosphoria formation in Montana 

and the lower limestone member of the Park City 

formation in Utah (McKelvey, 1949).

In southeastern Idaho most of the phosphatic beds 

are in the phospnatic shale member, and it is on this

member that most of our 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 

seven localities, and the available analytical data, are 

presented in the following pages. Their locations, as 

well as the locations of those reported previously 

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

and others, 1953; and Sheldon and others, 1953), 

and of others to be reported later, are shown in 

figure 1.

The semiquantitative spectrographic analyses 

are based upon comparison with a standard plate representing known quantities of the elements tested for 

and made at the same exposure. Greater sensitivities 

for many elements can be obtained by additional exposure. The standard sensitivities for the elements 

noted in the report are listed below:

Spectrographic sensitivities

O"U.

Ba 

Be 

Cd 

Ca 

Po

Cs 

Or 

Co 

Pn

Dy 

"Bin 

Percent

 0.001

 .01

 .1

 .0001

 .0001

 .001

 .001

 .01 

 .001

 .1

 *1.0

 .001

.01 

 .0001

 .01

 .01

 .m

Gd 

Ga 

(To

TIP

Ho 

In 

ir 

TPo

la 

Pb 

Li 

Lu 

Mg 

Mn 

Hg 

Mn 

Percent

 0.01

 .01

 .001

 .01

 .1

 .01

 .001

 .1

 .001

 .01

 .01

 ¥ n

 .01

 .0001

 .001

 .1

 .nm

Nd 

Ni 

Nb 

r\o __

Pd 

P 

pr 

Re 

T3Vi

Rb 

"Dii

O-VM

Sc 

en

ACT 

Percent

 0.01

 .01

 .01

 .1

 .01

 .1

 .01

 #1.0

 .01

 .1

 .01

 *10.0

 .01

 .1

 .001

 .0001

 .0001

Mr, _____ ___ ___

Sr 

Tb 

Tl 

Th 

Tm 

Q -v.

Ti 

_ _ __ _

V 

Yb 

Y 

r7,_

Zr 

Percent

 *0.1

 .01

 .1

 .1

- .01

 .1

 .1

 .01

 .01

 .001

 .1

 .01

 .0001

 .001

 .01

 .001

' A greater sensitivity may be obtained by additional exposures.

SELECTED BIBLIOGRAPHY

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

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

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

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

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

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

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

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

sections of the Phosphoria formation in Idaho, 

1947-48, pt. 2: U. S. Geol. Survey C ire. 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, pt. 1: 

U. S. Geol. Survey Circ. 208.

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, pt. 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, pt. 1: 

U. S. Geol. Survey Circ. 304.
Reservoir Mountain, Idaho, lot 1313

Phosphatic shale member of Phosphoria formation sampled in bulldozer trench on Reservoir Mountain, sec. 20, T. 

on east limb of Reservoir syncline. Beds strike 58* NW and dip 38* W. Section measured by J. D. Weiser, 

H. W. Peirce, and D. F. Davidson, and sampled by R. G. Waring and Peirce in September 1949. Samples an

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

Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A1203 Fe2°3

Loss on 

ignition

Ac

inso

Rex chert member of Phosphoria formation basal beds only

R- 2 

R- 1

4730- JDW 

4706-HWP

4. 1 

1.0

0.3 

7. 1 __

-- -- 86

60

Phosphatic shale member of Phosphoria formation

P- 94 

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

Mudstone- - - 

Mudstone -- -- _-__ _ _

Mudstone, phosphatic -- - -

Mudstone -- -- - -- -

Phosphate rock - - -

Thickness of bed P-77 uncertain 

because of crumpling.

Mudstone and argillaceous phosphate rock -

4729-HWP 

4728- JDW 

4827- JDW 

4726- JDW 

4725- JDW

4724- JDW 

4723- JDW 

4722- JDW 

4721- JDW 

4720- JDW

4719- JDW 

4718- JDW 

4717- JDW 

4716- JDW 

4715- JDW

4714- JDW 

4713- JDW 

4686- KBK

4685- KBK 

4 684 -KBK

4683- KBK 

4682- KBK 

4681 -KBK

1.3 

.6 

1.6 

1.0 

.6

.8 

1.3 

2.4 

.5 

.5

3.5 

2. 1 

.9 

1.0 

1.9

.8 

2.0 

3.0

5.0 

1.0

.8 

3.5 

1.7

28.8 

5.4 

5.6 

1.2 

.8

.8 

1.6 

4.0 

15.2 

29.9

1.3 

34.8 

36.0 

7.0 

33.9

21.2 

34.5 

29.0

22.0 

7.6

1.2 

9.4 

10.9

5.80 

1.44

9.85 

1. 17 

.95 

7.92 

1.62

4.80 

1.34 

2.94

1.12

2.78 

1.00

3.40 

.60 

.53 

3.28 

.88

2.10 

.63 

1.19

1.85

4. 10 

2.35

5.30 

2.75 

2.90 

10. 15 

2.95

4.45 

3.35 

7. 15

9. 10

20

68

60

79

79

79

75

68

49

18

80

6

3

68

8

34

6

12

28

64

81

52

55
Reservoir Mountain Continued

Bed 

no.

P-70 

P-70 

P-69 

P-68 

P-67

P-66 

P-65 

P-64

P-63 

P-62

P-61 

P-60 

P-59 

P-58

P-57 

P-56 

P-55 

P-54 

P-53

P-52 

P-51 

P-50 

P-49

P-48 

P-47 

P-46 

P-45 

P-44

P-43

Rock description

Mudstone, phosphatic and phosphate rock --

Phosphate rock, argillaceous, and

True stratigraphic thickness and 

lithology unknown.

TWT n H Q t rin & «. _ _ «

Stratigraphic interval along trench not 

exposed. True thickness and lithology 

of missing rock unknown.

Sample 

no.

4680- KBK 

4679- KBK 

4678- KBK 

4677- KBK 

4676- KBK

4675- KBK 

4674- KBK

4673- KBK 

4712- KBK 

4711 -KBK

4710- KBK 

4 709 -KBK 

4708- KBK 

4707- DFD

4755-MET 

4754-MET 

4753-MET 

4752-MET 

4751-MET

4750-MET 

4749-MET 

4748-MET 

4747-MET

4784-MET 

4783-MET 

4782-MET 

4781-MET 

4780-MET

4779-MET

Thickness 

(feet)

3.6 

3.9 

3.8 

3.5 

1.7

.8 

2.5

.7 

.8 

2.9

1. 1 

1. 1 

.5 

1.2 

9.

3.2 

.6 

2.0 

3.5 

2.5

1.3 

1.0 

1.5 

2.0 

27.

1.6 

1.3 

1.7 

.7 

2.0

1.7

Chemical analyses (percent)

P2°5

10.4 

9.4 

11. 5 

4.4 

20.4

10.2 

14.2

15.6 

7. 2 

5.8

3.3 

12.5 

11.3 

12.8

6.2 

13.9 

3.7 

2.8 

.2

14.4 

.4 

16.4 

1.4

2. 7 

2. 5 

2. 7 

7.5 

.9

14. 7

A12°3

--

Fe203

Loss on 

ignition

--

Ac

insol

56

61

60

75. 

36

62

52. 

42. 

66

68

78

48. 

55

44

72. 

45

80

82. 

83

45

87

41

86

85

79. 

73

69

89

46
P-42 Mudstone 4778-MET

P-41 Mudstone 4760-MET

P-40 Mudstone 4759-MET

P-39 Mudstone, phosphatic -- 4758-MET

P-38 Mudstone, phosphatic-- -- 4757-MET

P-37 Mudstone 4756-MET

P-36 Phosphate rock and mudstone- -- 4786-MET

P-35 Mudstone and phosphate rock 4785-MET

P-34 Carbonate rock -- -- - 4746-MET

P-33 Phosphate rock, argillaceous- - 4745-MET

P-32 Mudstone, carbonatic-- - 4744-MET

P-31 Phosphate rock 4743-MET

P-30 Phosphate rock - 4742-MET

P-29 Phosphate rock, argillaceous- -- 4741-MET

Thickness of bed P-29 is uncertain 

because of crumpling.

P-28 Phosphate rock, argillaceous- - -- 4740-MET

P-27 Carbonate rock, phosphatic 4739-MET

P-26 Mudstone, phosphatic 4738-MET

P-25 Carbonate rock 4737-MET

P-24 Phosphate rock __ 4736-MET

P-23 Mudstone, phosphatic 4735-MET

P-22 Carbonate rock, argillaceous- _ _ __-_ 4734-MET

P-21 Phosphate rock - 4733-MET

P-20 Phosphate rock, argillaceous- _____ 4732-MET

P-19 Phosphate rock, argillaceous- - 4731-MET

P-18 Phosphate rock - -- -- 4788-MET

P-17 Phosphate rock 4787-MET

P-16 Phosphate rock 4777-DFD 

P-15 Phosphate rock, argillaceous,

carbonatic -- --- - 4776-DFD

Limestone concretion _ -- --- 4775-DFD

P-14 Limestone, phosphatic- - - --- - 4774-DFD

P-13 Phosphate rock - 4773-DFD

P-12 Phosphate rock 4772-DFD

P-ll Phosphate rock, argillaceous--- - -- 4771-DFD

Thicknesses of beds P-ll and P-10 

uncertain due to crumpling and 

weathering.

P-10 Phosphate rock -- - 4770-DFD

P- 9 Phosphate rock 4769-DFD

1.0

.8

1.4

2.5

2.6

1.0 

3.6 

3.3 

1.0 

1.4

1.3

1.5

1. 1

.8

1.8

4.6 

.9 

1.7 

1.0 

2.0

1. 1 

2.8

1.6

1.7 

1.9

.8 

1.3

1.6

(-5)

2.5

1.8 

1.3 

2.4

1.5 

2.0

4. 1 

6.4 

5.7 

9.0 

13.5

5.0

20.8

24.4

4.6

23.6

7.4

31.0

33. 1

27.2

19.3

14.6

12.7

1.3

34. 5

14.9

5.2

30.9

26.6

20.0

34.9

30.8

30.0

14. 1 

8. 1

28.2

28.2

23. 1

33.0

33.8

6.20

5.34

1.34

4.76

5.16

2.35

1.47

3.28

4.76

1.26

5.92

.60

4.36

2.57

80

78

06

40

95

2.04

1. 11

3.32

1.30

1.84

2.50

2.83

78

67

2.76

2.48

1. 10

1.70

1.73

.93

1.05

1.75

1: 83

.65

2. 18

.78

.90

1.85

1.35

.87

1. 10

1.50

.80

1.20 

C.67

1.65 

.65

.74

.92

1.33

.37 

.36

5.85

7.40

31.47

4.50

21. 25

05

50

4.21

4.92

24.25

9.30

37.35

2.65

8.90

22.55

3.45

3.75

3. 15

1.50

2.60

6.70

17.35

30.80

6.35

3.40

6.90

5.50

5.40

73

64

62

50

38

75

34

27

16

28

35

10

6

17

37

11

45

16

7

40

34

13

23

40

6

14

8

23

7

10

15

24

3

3

* Cumulative data incomplete due to missing information.
Reservoir Mountain Continued

Bed 

no

P- 8 

P- 9 

P- 6 

P- 5 

P- 4

P- 3 

P- 2 

P- 1

Rock description

Phosphate rock -- -- - 

/""* g» yV^riTisj t<^ TTii"*lr d T*tfi 1 1 s> r*(^nn Q

Mudstone- -- --

Phosphate rock -- --- _______

Sample 

no.

4768-DFD 

4767-DFD 

4766-DFD 

4765-DFD 

4764-DFD

4763 -DFD 

4762-DFD 

4 761 -DFD

Thickness 

(feet)

1.3 

1.1 

1. 1 

1.7 

.5

.7 

1.3 

.2

Chemical analyses (percent)

P2°5

33.9 

33.0 

2.2 

. 1 

.3

.5 

. 7 

29.1

A1 2°3

1.01 

1. 10

Fe2°3

0.45 

.45

Loss on 

ignition

4.35 

2.40

Acid 

insolu

4.0 

7.8 

72.8 

42.4 

67.6

74.9 

56.2 

6.0

** Note incompleteness of cumulative data.
Rocky Canyon, Idaho, lot 1304

Phosphatic shale member of Phosphoria formation sampled in two adjacent bulldozer trenches on the west limb of t

Canyon, NE^ sec. 1, T. 6 S., R. 38 E., Bannock County, Idaho. Beds strike N. 40* W. and dip 20* E. Sect

R. A. Smart, R. S. Jones and H. W. Peirce and sampled by Smart and Peirce in August 1949. Samples analy

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

Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3 Fe2°3

L.OSS on 

ignition

Ac

inso

Rex chert member of Phosphoria formation

R- 6 

R- 5 

R- 4 

R- 3 

R- 2

R- 1

Mudstone - - - 

4320- FJA 

4319- FJA 

4318- FJA 

4317- FJA 

4316- FJA

4315- FJA

3.4 

2.8 

2.2 

.2 

2.8

2.3

0.8 

2. 1 

.5 

.4 

.4

1. 5

-- -- --

Phosphatic shale member of Phosphoria formation

P-94

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

Phosphate rock, argillaceous and

TV/Tiid ct rtno c*a yV^rvnu "M c*

Bed P-88 is highly weathered.

Mudstone- -- 

Fault between beds P-82 and P-83, ^ 

unexposed strata probably thin.

Phosphate rock, argillaceous- - --

4314- FJA 

4313- FJA 

4312- FJA 

4311- FJA 

4310- FJA

4309- FJA 

4308- FJA

4307- FJA 

4306- FJA 

4305- FJA

4304- FJA

4303- FJA 

4302- FJA

0.9 

1.4 

.9 

2.5

.7

.6 

2.5

.8 

.9 

1.2

2.9 

1.0

.7 

.7

4.3 

6.5 

.4 

15. 1- 

1.0

1.9 

.8

2.3 

8.5 

3.6

1.0

24.7 

8.6

--

--

--

8

8

8

8

8

8

7

6

4

4

8

7

4

5

5

6

7

2

4

* Cumulative data incomplete because of missing information.
Rocky Canyon Continued

Bed 

no.

Rock description

Sample 

no

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3 Fe2°3

Loss on 

ignition

Ac

insol

P-80 Phosphate rock 4301- FJA

P-79 Phosphate rock, argillaceous 4360- FJA

P-78 Phosphate rock 4359- FJA

P-77 Phosphate rock, argillaceous -- 4358- FJA

P-76 Phosphate rock and mudstone -- 4357- FJA

P-75 Mudstone, phosphatic 4356- FJA

P-74 Phospha.e rock, argillaceous -- 4355- FJA

P-73 Phosphate rock and phosphatic

	mudstone - 4354- FJA 

P-72 Mudstone, phosphatic 4353- FJA 

P-71 Mudstone, phosphatic 4352- FJA

P-70 Phosphate rock, argillaceous -- -- 4351- FJA

P-69 Mudstone, phosphatic - - 4325- FJA

P-68 Phosphate rock, argillaceous - --- 4324- FJA

P-67 Phosphate rock, argillaceous -- 4323- FJA

P-66 Phosphate rock, argillaceous -__- 4322- FJA

P-65 Mudstone, carbonatic - 4321- FJA

P-64 Mudstone 4350- RAS

	There is a possible overlap between 

	beds P-63 and P-64 due to difficult 

	correlation across shear zone.

P-63 Phosphate rock, argillaceous - 4349- RAS

P-62 Mudstone, phosphatic, and argillaceous

	phosphate rock- *4348- RAS 

P-61 Mudstone 4347- RAS

P-60 Mudstone, phosphatic 4346- RAS

P-59 Carbonate rock, argillaceous ------ -_-- 4345- RAS

P-58 Mudstone 4332- RSJ

P-49 Mudstone 4332- RSJ

P-56 Mudstone 4331- RSJ

P-55 Phosphate rock, argillaceous -- -- 4330- RSJ

P-54 Mudstone --- 4329- RSJ

P-53 Mudstone and phosphatic mudstone -- 4328- RSJ

P-52 Mudstone 4327- RSJ

P-51 Phosphate rock and mudstone - 4326- RSJ

P-50 Mudstone, phosphatic -- 4368- RAS

1. 1 

1.3 

1.6 

1.2 

1.6

1.9 

.8

2.2 

2.4 

1.9

1. 1

.5

.9

1.4

1.6

1.0 

3.0

1.3

2.0 

1.0

1.7 

3.2 

.6 

1.4 

2.4

.4 

2.6 

1.1 

2.6

.2

.7

35.3

18. 1

31. 7

17.8

15. 1

14.5

20.8

15.9

9.6

12.6

16.9

11.8

17.3

18.2

21.8

3.9 

5.4

23.0

22,7 

3.3

9.8

.5

8.5

2.3

.6

25.4

3.3

7.7

5.1

20.8

9.8

2

38

10

40

43

44

28

38

58

48

37

39

24

22

22

53

68

30

22

73

59

40

65

66

84

27

78

47

72

28

58
P-49 

P-48 

P-47 

P-46

P-45

P-44 

P-43 

P-42

P-41 

P-40

P-39 

P-38 

P-37

P-36 

P-35 

P-34 

P-33 

P-32

P-31 

P-30 

P-29 

P-28 

P-27

P-26

P-25 

P-24 

P-23

P-22 

P-21 

P-20 

P-19 

P-18

Mudstone - 

Mudstone - --- -- --

Mudstone, phosphatic - 

Mudstone ----- - - - --

Correlation between trenches is 

uncertain but sample 4392-HWP 

probably equals sample 4339 -HWP.

Mudstone -- -- -- 

Phosphate rock, argillaceous 

v^ druuncLic i ucjv

*D l*m cnlt Q to T*r»r»W a T*cfi 1 1 a r»or»nft

"PV^ncnViQ t a T*f^r*lr a T*cri 11 a r*<ion Q. _

Carbonate rock concretion in bed P-26 -

Phosphate rock, contains concretions

4367- RAS 

4366- RAS 

4365- RAS 

4364- RAS 

4363- RAS

4362- RAS 

4361- RAS 

4344-HWP 

4343-HWP 

4342-HWP

4341-HWP 

4 340 -HWP 

4339-HWP 

4338-HWP 

4337-HWP

4336-HWP 

4395-HWP 

4394-HWP 

4393-HWP 

4392-HWP

4391 -HWP 

4390-HWP 

4389-HWP 

4388-HWP 

4400- RAS

4399- RAS 

4398- RAS 

4397- RAS 

4396- RAS 

4379- RAS

4377- RAS 

4378- RAS 

4376- RAS 

4375- RAS 

4374- RAS

4373- RAS 

4372- RAS 

4371- RAS 

4370- RAS

4369-RAS

2.8 

2.7 

.6 

1.0

1. 1

1.7 

2.5 

1.4 

1.7 

2.0

1.2 

2.0 

1.0

(1C?

2.6 

1.5 

1.2 

1.6 

(.3

1.2 

1.3 

2.4 

1.6 

1.0

.7 

1.0 

1.6 

1.7 

1.2

1.4 

(1-0) 

1.2 

.9 

1.9

1.7 

2.0 

.6 

1.0

1.3

. 7 

.5 

7.3 

3.7 

19.7

22.9 

1.0 

3.7 

26.4 

8. 1

10. 5 

3.8 

29.4 

2.4 

17.0

19.4 

4.3 

3.. 8 

6.4 

28. 1

3. 1 

27.0 

22.7 

22.5 

1. 1

24.4 

6.6 

22.0 

21.0 

14.7

6.7 

.7 

8.6 

5.4 

13.3

14. 1 

7.3 

28.5 

32.6

32.6

0.51 

1.0

1.0

0.52 

.50

.55

11.88 

7.34

7.24

83

85

66

68

34

27

46

71

22

67

61

77

16

80

41

30

66

77

70

18

72

17

22

22

10

16

29

23

24

35

58

3

44

58

33

36

10

3

5

6
Rocky Canyon Continued

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3 Fe2°3

Loss on 

ignition

Ac

inso

P-17 Phosphate rock, argillaceous -- 4387-HWP

P-16 Mudstone and carbonate rock---- -- -- 4386-HWP

P-15 Phosphate rock and mudstone--- -- 4385-HWP

P-14 Phosphate rock, argillaceous- -- -- -- 4384-HWP

P-13 Carbonate rock, argillaceous 4383-HWP

P-12 Phosphate rock, argillaceous- -- 4382-HWP 

P-ll Phosphate rock, carbonatic ---- 4381-HWP 

P-10 Mudstone, phosphatic, and argillaceous

phosphate rock - -- -- 4380-HWP 

P- 9 Phosphate rock 4335-HWP 

P- 8 Phosphate rock, argillaceous 4334-HWP

P- 7 Phosphate rock, argillaceous, contains

carbonate rock concretion--- _--_ ____ 4407- RAS

P- 6 Phosphate rock, argillaceous --- ------- 4406- RAS

P- 5 Carbonate rock, phosphatic -------------- 4405- RAS

P- 4 Phosphate rock -- 4404- RAS 

P- 3 Phosphate rock 4403- RAS 

i-1

CO

P- I Phosphate rock, argillaceous- - -- 4402- RAS 

P- 1 Phosphate rock - 4401- RAS

0.7 

2.2 

1. 1 

1.3 

.7

1.2

1.3

3.0 

1.0 

1.7

2.6

1.3

1.4 

2.0 

2.0

1.0 

2.0

28. 1

4.9

26.7

20.5

5.3

17.4

23.8

20.3

28.8

26.8

19.6

24.7

8.3

33.0

35.7

20.2

35.3

2.0 

3.6 

2. 1 

3.6 

3. 1

5.2 

.32

2.4 

1.3 

2.7

3.2

2.6 

.65 

.85 

.35

3.9 

1. 1

0.83

1.36

.84

1.40

1.24

2. 04 

.26

1.50

.55

1.08

1.16 

.87 

.30 

.50 

.28

1.37 

.57

7.80

26.50

9.58

9.50

27.80

9.02

17. 78

8.24

11.34

10.46

14.24

10. 12

31.50

6.40

6.20

8.80

4.56

17

29

16

29

27

39

4

34

10

17

31

18

10

4

1

29

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PL, ft, PL, ft, PL, ft, ft, ft, ft, ft, ft, PL, PL, ft, 15
Gravel Creek Divide, Idaho, lot 1308

Phosphatic shale member of Phosphoria formation measured and sampled in a trench on south limb of Gray anticline 

T. 5 S., R. 43 E., Caribou County, Idaho. Beds strike N. 50* W. and dip 45* S. Section measured by R. G. W

Smart and sampled by Peirce and M. A. Warner in August 1949. Samples analyzed for P2Oc and acid insolub

laboratory, Albany, Oreg., and for other constituents by Trace Elements Section laboratory, U. S. Geologica

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3 Fe2°3

Loss on 

ignition

Acid 

insolu

Rex chert member of Phosphoria formation basal bed only

R- 1 Chert and mudstone -- 1.7 -- -- -- -- -- 

Phosphatic shale member of Phosphoria formation

P-74 

P-73 

P-72 

P-71 

P-70

_ P-69 

o» P-68 

P-67 

P-66

P-65 

P-64 

P-63 

P-62 

P-61

P-60 

P-59 

P-58 

P-57 

P-56

P-55 

P-54 

P-53 

P-52 

P-51

P-50 

P-49 

P-48 

P-47

X lllsO^Jlld LC J. l/l*J^, 1*I1C?JL LJr

Piiospiiate rock ______________

{** sa yhrwia t& Tf*f\f*\r 

1-^ Vi r\ Q Ti In Ji t ^ Tf*r\f+\r QYt crillQf> or\iiQ

"pl-i/-iQf-il-io 4-^ y»r\r*lf Q ycri 1 1 o r*omi Q

5849- RGW 

5848- RGW 

5847- RGW 

5846- RGW 

5844- RGW

5845- RGW 

5843 -RGW 

5842- RGW 

5841 -RGW 

5840- RGW

5839- RGW 

5838- RGW 

5837- RGW 

5821 -HWP 

5820- HWP

5819- HWP 

5818- HWP 

5817-HWP 

58 16- HWP 

5815- HWP

5814- HWP 

5813- HWP 

5812-HWP 

5811- HWP 

5810- HWP

5870- RAS 

5869- RAS 

5868- RAS 

5867- RAS

1. 1 

.8 

1.8 

1.8 

2.3

0.3)

1.8 

1.2 

1.7 

.5

1. 1 

1.3 

.6 

.9 

1.3

.7 

1. 1 

.8 

1.0 

1.3

1.0 

2.0 

1.5 

1.5 

1.4

1.3 

1.3 

1.4 

1.7

2.0 

1.4 

.4 

. 1 

2. 1

5.4 

5.5 

6.5 

1. 1 

2. 7

2.2 

2. 1 

25.7 

4.7 

1.3

1.3 

36.8 

35.2 

36.6 

34.0

37.2 

32. 0 

28.2 

9.6 

.6

16.8 

16.4 

6.7 

14. 1

0.54 

.82 

.75 

1.2

.76 

2.0 

2.6

0.59 

.70 

.50 

.59

.34 

.80 

1. 52

2.69 

2.33 

3.20 

2.20

3.26 

7.48 

8.27

72. 

74.

78.

81.

72. 

78.

64.

59.

81.

66.

84.

89.

29.

72.

81.

79.

4. 

8. 

4.

10.

2.

9.

16.

57. 

12.

39.

41.

64.

46.
P-46 

P-45 

P-44 

P-43 

P-42

P-41 

P-40 

P-39 

P-38 

P-37

P-36

P-35 

P-34 

P-33 

P-32

P-31 

P-30 

P-29 

P-28 

P-27

P-26 

P-25 

P-24 

P-23 

P-22

P-21 

P-20 

P-19 

P-18 

P-17

P-16

P-15 

P-14 

P-13

P-12 

P-ll 

P-10 

P- 9

P- 8 

P- 7

\^f cll?DOricL t6 I*OClt j cLrglllcLCGOUS "

f * 3 T*l"innsi'f'^ T*nr*k 9 T*cfi Tin r*^rtn ci _ _ _ _ _______

Phosphate rock, argillaceous,

"PVlrtQT^VlQ i"O TT\r»lf £1 Y* tf 1 lid r»Of"\ll C _

Mudstone, phosphatic and phosphate rock --

Phosphate rock, argillaceous, carbonatic --

JT iiuo^JllcL tt? * U^Jn.

5866- HAS 

5865- RAS 

5864- RAS 

5863- RAS 

5862- RAS

5861- RAS 

5860- RAS 

5859- RAS 

5858- RAS 

5857- RAS

5856- RAS 

5855- RAS 

5854- RAS 

5853- RAS 

5852- RAS

5851- RAS 

5809 -HWP 

5808- HWP 

5 807 -HWP 

5806- HWP

5805- HWP 

5804- HWP 

5803- HWP 

5 802 -HWP 

5801 -HWP

5836-RGW 

5835- RGW 

5834- RGW 

5833- RGW 

5832- RGW

5831 -RGW 

5830- RGW 

5 829 -RGW 

5828- RGW 

5827- RGW

5826- RGW 

5889- HWP 

5888- HWP 

5887- HWP

5886- HWP 

5885- HWP

1.4 

1.4 

.9 

2.1 

1.0

1.8 

.8 

.9 

1.0 

.8

1.6

1.5 

1.7 

1.3 

1. 1

1.0 

.9 

.8 

1.7 

3.0

2.5 

1.0 

1.0 

3.0 

1.9

2.0 

2.4 

1.9 

1.4 

.9

2.0 

(1.5) 

2. 1 

.8 

1.6

2. 1 

2.8 

1.2 

1.6

3.0 

2.4

19.3 

2.8 

6.4 

12. 1 

8.9

1. 2 

13.3 

17. 1 

5.4

16.6 

17.5 

2.2 

17.6 

20.5

4. 5 

20.5 

17.0 

1.3 

1.4

8. 1 

26.1 

2.8 

28. 1 

18.7

27. 1 

24.7 

16.6 

16.3 

13.8

16.9 

6.4 

12.9 

34.9 

27.6

2. 1 

19.5 

16.8 

5.8

28.8 

33.6

2.2 

10.5 

2.9 

3.6

2.2 

2.4 

4.2 

4.6 

2.2

4.7

5.0 

.59 

2.3

2.8 

3.8 

5. 1 

3.2

2.0 

1.0

1.01 

3.34 

1. 12 

1.65

.98 

1.00 

1.61 

1.92 

.94

1.68

2.23 

.51 

1.03

1.06 

1.63 

2.09 

1. 11

1.01 

.58

10.05 

21.85 

10.00 

14.08

11.32 

11.53 

12. 75 

12.03 

23. 10

10; 53

13.50 

7.81 

9.72

34.35 

9.15 

6.50 

29.22

8.80 

6.50

36

31

71

54

64

39

41

32

43

23

28

70

34

26

24

22

38

6

6

62

18

48

13

29

14

18

35

36

17

37

10

39

2

15

22

32

43

24

12

5

* Cumulative data incomplete because of missing information. Computations start from zero after interrupti
Gravel Creek Divide Continued

Bed 

no.

P- 6 

P- 5 

P- 4 

P- 3 

P- 2

P- 1

Rock description

J. I1VJO£J11CL LC JL f wJR.

Sample 

no.

5881-MAW 

5880-MAW 

5879-MAW 

5878-MAW 

5877-MAW

5876-MAW

Thickness 

(feet)

0.7 

1.7 

1.7 

2.4 

4.8

.4

Chemical analyses (percent)

P2°5

27. 7 

35. 2 

33.8 

30.6 

.80

34. 5

A1 2°3

2.2 

.74 

.85 

1. 7 

4.0

.74

Fe2°3

1.32 

.48 

.69 

1.26 

1.80

.56

Loss on 

ignition

6.93 

5.96 

7. 12 

6.35 

29.80

4. 19

Ac

inso

18

2

3

10

32

4
Corral Creek. Idaho, lot 1.315

Lower part of phosphatic shale member of Phosphoria formation measured and sampled in a bulldozer trench in SE

County, Idaho. Beds strike approximately north-south and dip 40* E. Section is incomplete due to faulting 

K. Lutz and A. L. Bush and sampled by H. W. Peirce and R. G. Waring in October 1949. Samples analyzed 

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

Washington, D. C.

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3 Fe2°3

Loss on 

ignition

A

inso

Phosphatic shale member of Phosphoria formation lower part only

P-7

P

i

P-5

P-4

P-3

P_?

P-l

Bed P-2 is slightly crumpled and 

weathered.

4565- KL

4564- KL

4563- KL

4562- KL

4561- KL

A£AA- ATT*

0.6

1.9 

.6

1.2

1

0

.4

23. 1

34.5 

35.6

7 K Q

34.3

31.7

6.4

1.3

1.0

.91

1.5

.64

2.51 

.64

.61

CO

on

.37

6 QQ

4.04

3.91 

300

5. 10

2

5

3

f

5

10
Henry. Idaho, lot 1309

Phosphatic shale member of Phosphoria formation measured and sampled in bulldozer trench on the east limb of the W

T. 6 S., R. 42 E., Caribou County, Idaho. Beds strike N. 50* W. and dip 50-75° E, Section measured by M. 

R. A. Smart and sampled by Smart in August and September 1949. Samples analyzed for P2O,-and acid insolub

laboratory, Albany, Oreg., and for other constituents by Trace Elements Section laboratory, u. S. Geologica

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3 Fe203

Loss on 

ignition

Acid 

insolu

Rex chert member of Phosphoria formation basal beds only

R- 4 

R- 3 

R- 2 

R- 1

--

1.9 

3.7 

3.5 

5.0

-- -- -- -- --

Phosphatic shale member of Phosphoria formation

P-119 

P-118 

P-117 

P-116

P-114 

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

Phosphate rock, contains carbonate

T*f"ir»lr loncoc

4477-MET 

4476-MET 

4475-MET 

4474-MET 

4473-MET

4281- JDW 

4280- JDW 

4279- JDW 

4278- JDW 

4500- JDW

4499- JDW 

4498- JDW 

4497- JDW 

4496- JDW 

4276- RAS

4275- RAS 

4274- RAS 

4273- RAS 

4272- RAS 

4271- RAS

4270- RAS 

4269- RAS

4268- RAS 

4267- RAS 

4266- RAS

1.6 

3.9 

1.3 

1.8 

2.0

4.0 

1.6 

.7 

1.0 

1.2

3. 1 

1 3 

1.2 

1.4 

.3

.8 

.7 

3.0 

.7 

1.7

2.0 

.8

1.2 

.6 

.7

0.80 

2. 55 

21 40 

5.35 

2.00

1. 10 

2.20 

4 65 

1 25 

.45

5. 00 

2.60 

2.60 

1 10 

14.30

2.30 

3.60 

1.80 

28.40 

3. 10

1.40 

34.00

36.00 

36.00 

8.50

1.2 

8.3

8.8 

.65

.76 

.66 

8.5

1.56 

2.88

2.80

.57 

.35 

3.36

3.92 

5.78

9.15 

2.15

5. 14 

7.30 

4.27

84.3 

68.6 

35.9 

61.0 

72.8

78.6 

83. 1 

63.6 

78.9 

80.7

63.0 

72.2 

35.5 

15. 1 

36.3

77. 5 

64.9 

83.5 

20.6 

76.7

73.4 

12.3

2.7 

3.4 

67.2
P- 94 

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 

P- 57 

P- 56

P- 55 

P- 54 

P- 53

Carbonate rock concretion in bed P-89

Carbonate rock and phosphatic

Phospiiate rock, argillaceous 

T-^ViOQnliKi t^ Y*f\f*\t & vff i llsift^fiiiQ _ _ _

Mudstone, phosphatic - - - --- --

Mudstone---- -- -- - 

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

4265- RAS 

4277- RAS 

447Z-MET 

4471-MET 

4470-MET

4469-MET 

4468-MET 

4467-MET 

4466-MET 

4465-MET

4464-MET 

4463-MET 

4462-MET

4461 -MET 

4460-MET

4300-MET 

4299-MET 

4298-MET 

4297-MET 

4296-MET

4495- JDW 

4494- JDW 

4493- JDW 

4492- JDW 

4491- JDW

4490- JDW 

4489- JDW 

4488- JDW 

4487- JDW 

4486- JDW

4485- JDW 

4484- JDW 

4483- JDW 

4482- JDW 

4481 -JDW

4480- JDW 

4264- RAS 

4263- RAS 

4262- RAS 

4261- RAS

4260- RAS 

4259- RAS 

4258- RAS

1.9 

.7 

1.5 

1.0 

1.2

(.8) 

1.6 

1.6 

1.9 

1.6

1.8 

2.3 

4.2

1. 1 

2.2

3.0 

1.9 

1. 1

i. 1 

2.0

2. 1 

.9 

1.5 

1.5 

5.0

.9 

1.0 

2.2 

5.0 

1.0

.8 

1.0 

.8 

1.5 

1.8

.5 

.5 

.7 

1.7 

1.3

1.2 

1.2 

1.8

34.80 

21.9 

34.9 

33.8 

29.6

4.05 

30.7 

22.6 

23.95 

19.4

8.75 

1.9 

9.3

5.85 

15.0

5.2 

12.2 

9. 1 

12.9 

21.8

1.2 

4.8 

16.4 

14,6 

8.5

20.7 

13.3 

6.0 

4.3 

7.3

27.2 

9.2 

13. 1 

17.5 

8.3

14.2 

3.6 

32.0 

8.65 

3.3

8.4 

.9 

2.65

.76 

5.6 

.81 

1.2 

2.0

.50 

.20 

.49 

.56 

.70

5.88 

5. 15 

5.55 

5.95 

8.90

5.0 

34.5 

4.4 

4.9 

10.6

2. 

7.2 

23.0 

21.9 

28. 

54.2 

25.3 

52. 

19.5 

42.7

67.0 

48. 

58.7 

49.9 

34.2

42.2 

77.0 

45.5 

45.7 

61.8

33.7 

50.8 

68.6 

72.0 

55. 

16.3 

60.2 

40.9 

33.6 

62.5

49.6 

82. 

10.7 

64.3 

79. 

60.9 

59.0 

76.3
Henry Continued

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3 Fe2°3

Loss on 

ignition

Ac

insol

P-52 Phosphate rock, argillaceous- --- 4257- RAS

P-51 Mudstone, carbonatic---- ----- 4256-RAS

P-50 Mudstone, phosphatic -- 4255- RAS

P-49 Phosphate rock, argillaceous - - - 4665-JDW

P-48 Carbonate rock and carbonatic mudstone --- 4664-JDW

P-47 Limestone-- 4663-JDW

P-46 Mudstone 4662-JDW

P-45 Mudstone -- 4661-JDW

P-44 Mudstone -- 4660-JDW

P-43 Phosphate rock, argillaceous - --- - 4295-MET

P-42 Mudstone 4294-MET

P-41 Mudstone, phosphatic, carbonatic----- -- 4170-MET

P-40 Mudstone, phosphatic, carbonatic ------ - 4169-MET

P-39 Carbonate rock 4168-MET

P-38 Mudstone and phosphate rock 4167-MET

P-37 Phosphate rock, argillaceous - ---- -- 4166-MET

P-36 Carbonate rock, argillaceous - --- ----- 4165-MET

P-35 Mudstone, phosphatic-- ______ -_- 4164-MET

P-34 Phosphate rock, argillaceous - ----- -- 4163-MET

P-33 Phosphate rock - -- - - 4162-MET

P-32 Phosphate rock ---- -- 4161-MET

P-31 Phosphate rock, argillaceous 4119-MET

P-30 Phosphate rock 4118-MET

P-29 Mudstone, phosphatic -- 4117-MET

P-28 Phosphate rock, argillaceous --- -- 4116-MET

P-27 Phosphate rock, argillaceous- 4659-JDW

P-26 Carbonate rock, phosphatic -- 4658-JDW

P-25 Phosphate rock, argillaceous 4657-JDW

P-24 Mudstone -- 4656-JDW

P-23 Phosphate rock 4655-JDW

P-22 Phosphate rock, argillaceous- - - 4654-JDW

P-21 Mudstone, carbonatic ------ 4653-JDW

P-20 Phosphate rock, argillaceous-- ----- 4652-JDW

P-19 Mudstone, phosphatic --- ---- 4651-JDW

P-18 Carbonate rock, argillaceous- - 4115-MET

P-17 Phosphate rock, argillaceous - 4114-MET

P-16 Phosphate rock and argillaceous

	phosphate rock --- ---- 4113-MET

1.6 

1.2 

2.0 

.8 

3.1

5.0 

5.0 

2.4

1.7

1.8

3.4 

2.5 

1.9 

.9 

1.9

1.0 

1.6 

.7 

2.5 

1.8

1.3 

1.3 

2.0 

1.3 

1.1

1.4 

1.6 

2.2 

1.2 

.9

3.6 

2.2 

2.0 

2.3

1.8

2.2 

1.5

15.0

5. 2

14.8

19.7

7.6

2.3

7.4

3.2

17.6

6.8

11.6

10.6

1.5

11.2

16.6

1.0

8. 2

21.2

26.4

30.0

24. 0

29.4

15.4

18. 1

17. 

10. 

22.

2.05

33.6

27. 2

3.7

26.8

17.0

2.9

27. 5

26.1

2.0

.44 

1.5 

3.8

3.2

5.8 

3.5

2. 1 

3.7 

2.0 

5.3 

4.3

4.5 

1.3 

2.8 

6.9 

1.0

2.8 

6.3 

2.6 

5.0 

3.3

2.3 

3.0

0. 70

. 15

.58

1.45

1.26

2.56

1.73

1. 12

1.48

1.50

2.00

1.57

1.63

.34

1.01

2.43

.37

.67

2.38

.96

2.44

1. 10

1. 19 

.93

8.90

39.78

9.55

11.68

10. 65

8. 87

9.93

7.23

10. 13

8.92

12.90

10.70

12.37

30.70

10.50

7.25

7.57

7. 53

14.03

7.65

20

29.52

7.72

7.85

28

46

37

27

29

15

78

68

81

39

62

36

25

1

40

39

18

54

27

13

9

20

10

37

38

33

9

24

76

5

19

59

20

43

26

18

20
P-15 Phosphate rock -- -- 4112-MET

P-14 Phosphate rock - 4111-MET

P-13 Mudstone, carbonatic -- 4110-MET

P-12 Phosphate rock---- -- -- 4109-MET

P-ll Carbonate rock-- ----- 4108-MET

P-10 Phosphate rock 4254- RAS

P- 9 Phosphate rock -- ---- 4253- RAS

P- 8 Phosphate rock -- 4252- RAS

P- 7 Phosphate rock 4251- RAS

P- 6 Phosphate rock -- ----- 4250-RAS

	Beds P-6 through P-8 are slightly 

	crumpled and weathered.

P- 5 Phosphate rock---- -- 4249- RAS

P- 4 Mudstone, phosphatic---- --- ---- 4248- RAS

P- 3 Mudstone, carbonatic---- 4247- RAS

P- 2 Mudstone - -- 4246- RAS

P- 1 Phosphate rock - 4245- RAS

2.8 

2.8 

.7 

1.3 

1. 1

2.5 

1. 1 

1.8 

1.7 

1.5

1.0

.8

2.6

1.0

.3

29.8

30.6

6.0

29.2 

4.6

29.3

28.0

34.0

33.8

33.5

32.4

8. 1

.55

1.35

34.5

1.8 

1.5 

5.9 

2.2 

2. 1

2.4 

.71 

.78 

.90 

.75

1. 2

.83

1.31

1.99

1. 13

.57

.62 

.89 

.47 

.45 

.57

.74

6.44

7.67

15.85

6.50

35.55

7. 18

6.42

6. 15

6.80

6.55

4.85

13

10

52

15

11

13

14

3

3

3

8

52

62

64

4
Enoch Valley. Idaho, lot 1314

Phosphoria formation sampled on west limb of Snowdrift anticline on west flank of Rasmussen Ridge in Enoch Valley, 

County, Idaho. Beds strike N. 65° E. and dip 40° W. Section measured by J. D. Weiser, R. A. Smart, K. B. 

Peirce, and D. F. Davidson and sampled by Peirce and R. G. Waring in August 1949. Samples analyzed for P

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

ington, D. C.

Bed

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3 Fe203

Loss on 

ignition

Acid 

insolu

Rex chert member of Phosphoria formation basal beds only

R- 2 

R- 1

r^VioT*t 6050- JDW 

6049- JDW

0.4 

.8

0.2 

8.4 __

--

--

90.

66.

Phosphatic shale member of Phosphoria formation

P-106

P-105 

P-104 

P-103

CO

^P-102

P-101 

P-100 

P- 99 

P- 98 

P- 97

P- 96 

P- 95 

P- 94 

P- 93 

P- 92

P- 91 

P- 90 

P- 89 

P- 88 

P- 87

P- 86 

P- 85 

P- 84 

P- 83 

P- 82

Phosphate rock and argillaceous

nHnonVi Q to T*r\*"* t

Mudstone ------ -- - _________

Phosphate rock and argillaceous

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

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

6048- JDW 

6073- RAS 

6072- RAS

6071- RAS 

6070- RAS

6069- RAS 

4283- KBK 

4282- KBK 

3919- KBK 

3918- KBK

3917- KBK 

3916- KBK 

3915- KBK 

3914- KBK 

3913- KBK

3912- KBK 

3911- KBK 

3910- KBK 

6068-MAW 

6067-MAW

6025-MAW 

6024-MAW 

6023 -MAW 

6022-MAW 

6021-MAW

0.7 

1.5 

1.6

1.0 

1.8

.8 

.9 

1.8 

1. 1 

1.6

1.8 

1.6 

2.6 

2.0 

1.4

.8 

1. 1 

1.9 

1.9 

1.2

2.2 

1.8 

1.9 

1.9 

1.7

24.3 

1. 1 

35. 7

29.3 

35.2

16.8 

6.5 

2. 7 

2.6 

.8

.8 

.9 

4. 1 

1.2 

6. 5

1. 5 

20.9 

1.8 

34. 7 

32. 8

27.2 

27.0 

23.6 

9.3 

1.8

0.96

2.74 

1. 11

.92 

1.76

3.00 

2.83

0.46

1.28 

.76

.48 

.71

1. 14 

.96

3.57

4. 70 

3.05

3.30 

5.48

10.90 

9.88

25.

81.

5.

16.

6.

45.7 

60.

67.

71. 

77.

78. 

76.

65.4 

13.4 

65.

58.

39,

78. 

4.

7.

13.

15.

23.

57. 

49.
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

DO

en p- 62

P- 61 

P- 60 

P- 59 

P- 58 

P- 57

P- 56 

P- 55 

P- 54 

P- 53 

P- 52

P- 51 

P- 50 

P- 49 

P- 48 

P- 47

P- 46 

P- 45 

P- 44 

P- 43 

P- 42 

P- 41

Mudstone ____ ______ ___ _ __

Mudstone, phosphatic - __- - -

Mudstone, phosphatic - -_ -- ---

Mudstone -- - ______ 

Mudstone--- - - - - 

Mudstone, phosphatic - - -- --

Beds P-63 and P-64 are slightly 

crumpled.

Mudstone-- --- - --

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

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

"pV)|-|QT\V)o t/a T»of*lr ai"cfi 11 a r*f» ruiQ

Mudstone, phosphatic- ---- - - 

Oarbonate roclc argillaceous

6020-MAW 

6019-MAW 

6018-MAW 

6017-MAW 

6016-MAW

6015-MAW 

6014-MAW 

6043- JDW 

6042- JDW 

6041- JDW

6040- JDW 

6039- JDW 

6038- JDW 

6037- JDW 

6036- JDW

6035- JDW 

6034- JDW 

6033- JDW 

6032- JDW

6031- JDW

6030- JDW 

6029- JDW 

6028- JDW 

6027- JDW 

6026- JDW

6013-MAW 

6012-MAW 

60 11 -MAW 

6010-MAW 

6009-MAW

6008-MAW 

6007-MAW 

6006-MAW 

6005-MAW 

6004 -MAW

6003-MAW 

6002-MAW 

6001 -MAW 

6000-MAW 

6066- RAS 

6065- RAS

2.0 

1.1 

1.6 

2. 1 

2.3

1.6 

1.0 

2.2 

1.7 

2.2

.6 

.9 

.9 

1.4 

.5

.6 

2.2

.8 

1.2

.6

2.0

.5

2.0

1. 1

.5

2.3 

3.4 

3.4 

1.9 

1.2

1.9 

.6 

1.3 

2.0 

1. 1

2.3 

2.8 

2.5 

2.8 

2.5 

1.0

12.7

10.6

16.4

6.4

15.5

24.4 

9.9

12.6 

8.7

12.7

4.7 

8. 1 

5.4 

6.9 

23.3

10.3

24. 1

26.7

32.9

18.5

6.6

15. 7

7.8

16.5

9.0

18.2

14.4

.6

3.2

1.2

8.5

.8

1.8

17.5

7.8

12.6

9.7

9.4

8.5

1.0

11.7

44.

57.

37. 

59.

42. 

30.

61.

56.

64.

53.

60.

63.

69.

66.

25.

63.

22.

26.

12.

42.

71. 

41. 

65.

37.

62.

39.

42.

11.

72.

81.

63.

87.

83.

38.

64. 

49.

44. 

30

39.

34.

44.
Enoch Valley ^Continued

Bed 

no.

P-40 

P-39 

P-38 

P-37 

P-36

P-35 

P-34 

P-33

P-32 

P-31

P-30

P-29 

8 P-28 

P-27 

P-26

P-25 

P-24 

P-23

P-22 

P-21

P-20 

P-19

P-18 

P-17 

P-16

P-15 

P-14 

P-13 

P-12

Rock description

Mudstone, phosphatic - - 

f~* Q i^l-vrtn Q to T* fir* lr ..

13 Vi rvcnVia to Y*fir»lr Q T*CFI 1 la f*^fin c

"DVirv cnVl Q to T*fir»lr _ _ 

"PhfkQnVia to T*fir»lr

TD Viffc Q n Vi Q t o T*/"k("»lr » _ __ »_

Phosphate rock, argillaceous and

nVifkcnViQ to T*fif*lr _ _ _ _

"PVi ft cm Vi si t o T* fir* lr Q f*cf^ 1 1 n f*^/"in c _ _ «. «. . »

"PVi /"hdiniVisi to T* fir* lr Q T*cri 1 1 Q r»^/"Mi Q . _ . .. »_.

Beds P-30 and P-31 are slightly 

crumpled.

Mudstone, phosphatic, and argillaceous

"Phf\cr^ViQ to T*rtr*lr a nH tvi nH dtrtno .

Phosphate rock and argillaceous

Bed P-19 is slightly crumpled.

Sample 

no.

6064- RAS 

6063- RAS 

6062- RAS 

6061- RAS 

6060- RAS

6059- RAS 

6058- RAS

6057- RAS 

6056- RAS 

6055- RAS

6054- RAS

6053- RAS 

6052- RAS 

6051- RAS 

4692- HWP

4691-HWP 

4690- HWP

4689- HWP 

4688- HWP 

4687- HWP

4666- KBK 

4292- KBK

4291 -KBK 

4290- KBK 

4289 -KBK

4288- KBK 

4287- KBK 

4286- KBK 

4672- DFD

Thickness 

(feet)

0.5 

.9 

.6 

2.3 

1. 1

1.3 

2.0

1.5 

1. 1 

1.4

1.3

1.9 

1.1 

.9 

2.7

2.0 

1.5

1.4 

2.0 

1.6

4.4 

1.9

3.8 

2.0 

1.2

2.6 

1.5 

2.0 

1.4

Chemical analyses (percent)

P2°5

0. 8 

10 6 

.2 

17.3 

30.4

29.5 

28.5

27.0 

19.6 

15. 7

19.7

16.1 

21.3 

22.3 

33.2

26.? 

6.4

13. 1 

25.9 

18.3

4.5 

27.6

5.4 

29.3 

34.5

35.4 

34.4 

29.9 

6.4

A12°3

1.40 

1.06

1.01 

1.27 

2.12 

2.44

Fe2°3

0. 77 

.68

.49 

.76 

1. 14 

.91

Loss on 

ignition

8.95 

5.45

3.85 

4. 10 

5.50 

30.58

Aci

insolu

3.

46.

13. 

31.

6.

14

13

15. 

31.

40. 

31. 

38. 

35. 

29.

7. 

19.

69.

50.

25.

41.

41.

17

46.

11.

5.

5.

7.

16

19. 
P-ll Phosphate rock, argillaceous- - - 4671-DFD 

Bed P-ll is slightly crumpled.

P-10 Carbonate rock-- -- 4670-DFD

P- 9 Phosphate rock 4669-DFD

P- 8 Phosphate rock, argillaceous - - - 4668-DFD

P- 7 Phosphate rock -- - - 4667-DFD

P- 6 Phosphate rock-- -- ---- 4285-DFD 

P- 5 Phosphate rock ---- - 4284-DFD

Bed P-5 is slightly crumpled and 

weathered.

P- 4 Phosphate rock 5825-HWP

P- 3 Mudstone, carbonatic -- 5824-HWP

P- 2 Mudstone 5823-HWP

P- 1 Phosphate rock 5822-HWP

1.4

1.2

2.7

..8

1.0

.8 

1.5

1.4 

2.9 

1.5

.5

27.0

5.4

28.6

28.2

33. 7

33.4

32.4

31.3

.4

4.2

35. 1

2.50

1.66

1.86

1.96

.69

.54 

.75

1.31

5.10

7.40

.62

1.03

.51

.86

1.08

.41

.52 

.59

.83 

..98 

1. 61

.53

8.98

34.95

8.63

6.85

6. 18

36.60

7.72

5.90

23.72

8.57

3.30

16

8

10

16

2

3

3

7. 

44

62

3
Ballard Trench, Idaho, lot 1316

Lower portion of the phosphatic shale member of the Phosphoria formation sampled in bulldozer trench on the west 

sec. 7, T. 7 S., R. 43 E., Caribou County, Idaho. Section measured and sampled by H. W. Peirce and R. G. 

analyzed for P->Oc and acid insoluble by U. S. Bureau of Mines laboratory, Albany, Oreg., and for other con

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

Bed 

no.

Rock description

Sample 

no.

Thickness 

(feet)

Chemical analyses (percent)

P2°5 A12°3 Fe2°3

Loss on 

ignition

Ac

inso

Phosphatic shale member of Phosphoria formation

P-18 Carbonate rock, phosphatic-- ------ 4579-HWP

P-17 Phosphate rock 4578-HWP

P-16 Phosphate rock 4577-HWP

P-15 Phosphate rock 4576-HWP

	Carbonate rock, argillaceous,

	phosphatic lens- - - 4775-HWP

P-14 Phosphate rock 4574-HWP

P-13 Phosphate rock and mudstone lens-------- 4573-HWP

P-12 Phosphate rock and argillaceous carbonate

	rock 4572-HWP 

P-ll Carbonate rock 4571-HWP 

P-10 Phosphate rock 4570-RGW

P- 9 Carbonate rock, phosphatic - -- ---- 4569-RGW

P- 8 Carbonate rock, phosphatic 4568-RGW

P- 7 Phosphate rock 4567-RGW

P- 6 Phosphate rock 4566-RGW

P- 5 Phosphate rock 4549-RGW

P- 4 Phosphate rock 4548-RGW

P- 3 Carbonate rock, argillaceous - 4547-RGW

P- 2 Carbonate rock, argillaceous- _______ 4546-RGW

P- 1 Phosphate rock 4545-RGW

1. 1

. 7

1.0

1.5

(.7)

.8 

2.7

1.5 

'.5

1.5

1.6 

.7 

1.6 

1.0 

1.8

.7 

2.3 

1.2

.6

15. 1

36.4

35.4

32. 1

7.9

35.6

27.3

16.2

2.0

27.8

10.4

12.9

34.7

33. 5

32.3

31.5 

.5 

.7

32.2

0.88 

.37 

.74

1.8

3.0

.78 

3.0

2.0 

2.9 

2.5

1. 1

1.0 

.64 

.94 

.73

1.4 

3.9 

5.3 

.35

0.42 

.49 

.49 

.85

1.15

. 54 

1.21

.83 

.38 

.95

.49 

.63 

.40 

.50 

.48

.57

1.43

1.87

.33

25. 88

5.22

5.68

5.81

27. 73

6.31

15.38

22.75

41.21

8.64

30.90

29.50

6.49

7.72

6.98

5.47

29.24

23.33

7.51

10

2

3

9

23

2

19

12

9

13

12

6

2

3

4

9

35

43

4