GEOLOGICAL SUEVEY OF THE TEREITOEIES. 



451 



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SECTION OF THE ROCKS EXPOSED ON SULPHUR CREEK, NEAR BEAR 



RIVER, WYOMING. 



Ft. In. 



1. — Black shale, only seen in bottom of Sul- 

 phur Creek, thickness unknown. 

 2. — Slope apparently occupied by clays, 



thickness perhaps 100 feet or more 100 



3. — Soft light grayish sandstone, nearly 



vertical 90 



4. — Covered space, probably occupied by 

 clays, but showing some sandstone that 

 may or may not be in place 5 perhaps room 



enough for 250 to 300 feet 300 



5. — Two or three rather heavy beds of light 

 yellowish gray sandstone, separated by 

 clays, probably occupying some of the space 

 included in division 4. N^ar the lower part 

 two layers 15 to 18 inches each, of sand- 

 stone, containing Ostrea soleniscus, 'Trap- 

 ezium micronema, &c. Altogether 90 to 100 



or more 100 



6. — Greenish and bluish gray sandy clays, 



with some dark shale at places 100 



7. — Bed of good coal, said to be 7J feet in 



thickness 7 6 



8. — Heavy massive bed of light colored 

 sandstone, about 90 feet in thickness, stand- 

 ing nearly vertical, with some 3 to 5 feet 

 of sandy clay between it and the coal of 



division 7 95 



9. — Gray sandy shales with alternations of 



sandstone and clays. 255 



10. — Light gray saijdstone ... 20 



11. — Slope and unexposed space, perhaps 

 200 yards or more across. 

 12. — Light gray sandstones and clays, in- 

 cluding a bed of good coal, said to be 7^ 

 feet in thickness; all dipping south-south- 

 east 55° below horizon 5 and the sandstone 

 above the coal containing many casts, Inoc- 

 eramus proMematiciis, with a few casts of 

 Cardium and undetermined univalves; al- 

 together showing about 150 



13. — A valley or depression showing no 

 rocks, perhaps 150 yards across. 

 14. — Ferruginous sandstone in thin layers, 

 dipping north-west about 80° below hori- 

 zon 40 



15. — Bluish laminated clays with, at top, 

 (left or west side,) a two-foot layer of sand- 

 stone, containing fragments of shells not 



seen in a condition to be determined 125 



16. — Clays and sandstone below, (20 feet;) 

 gray and brown pebbly sandstone above, 

 (25 feet) ■ 45 



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