380 REPOET UNITED STATES GEOLOGICAL SURVEY. 



6. Chocolate-colored shales, 60 yards across the exposure. 



7. Heavy-bedded, hard, gray limestone, obscure exposure. 



8. Eeddish shales, thick deposit. 



9. Gray sandstone, obscure exj)osure, 200 yards K. E. of bed 3 ; dip 

 50O, S. 55° W. 



10. Eed shales, 100 yards. 



11. Heavj^-bedded, rough-weathered, bluish-drab limestone, much 

 fractured by joint and cleavage structure; dip 50° to 55°, S. 50° W. 



11a. Drab, spar-seamed limestone, probably belonging to preceding 

 bed, curved over and forming part of an arch, as seen at — 



11&. Limestone same as preceding ; dip IS". 45° E. at an angle of 18°, 

 more or less. 



lie. Limestone, similar to the preceding bed, exi^osed in foot of accliv- 

 ity rising into Station XXIY ; dip south westward at an angle of 30°. 



lid. Limestone, similar to preceding, bedding much obscured by Joint 

 and cleavage structure, exposed 20 feet ; dip 30°, W. 20° X. Forms 

 summit ledge at Station XXIV. The limestones mentioned under the 

 above numbers, 11-11<^, ai)pear to be inverted in a sharp fold in the oppo- 

 site side of the gulch to the northwest, as mentioned in a preceding 

 page. 



12. Red shales, 50 yards. 



13. Eeddish-gray sandstone, beautifully laminated, a heavy bed, 10 

 feet exposed ; clip 25° to 30°, westward. 



14. Unexposed. 



15. Sandstone, similar to preceding bed. 



16. Unexposed. 



17. Sandstone, like the preceding. 



18. Eeddish chocolate-colored shales. 



19. Dark brown and gray, gritty, shaly limestone, with Ostrea strigu- 

 lecula {?), underlaid by gray shaly sandstone, 20 feet exposed; dip 30°, 

 S. 65° W. Outcrop 200 to 300 yards below bed l^o. 13. 



20. Unexposed, 20 to 30 feet. 



21. Heaw-bedded reddish sandstone, 20 feet exposed. 



22. Eed shales, 50 to 75 feet. 



23. Thin-bedded, reddish-gray sandstones, with ripx^le markings, 15 

 feet exposed. These heavy sandstone ledges are finely exposed in the 

 slopes on the opposite side of the caiSon to the southeast. 



24. Dark blue and chocolate-colored shales, 100 feet or more, exposed 

 in saddle. 



25. Heavy-bedded gray limestone, with obscure spiculse and Fentacrmus 

 remains, exposed 10 feet ; dip 25°, W. 30° IST. The bluii' or transverse 

 ridge outcrop of the ledge is some 300 or 400 yards below the bluff ex- 

 posure of bed Xo. 19, the west-facing slope being covered with limestone 

 debris to the saddle. 



26. Drab or blue indurated calcareous shales. 



27. Drab limestone, obscure bench exiDOsure. 



28. Eeddish and drab shales. 



29. Drab, brittle limestone, even bedded below, exposed 15 feet, 400 

 to 500 yards below bed Xo. 25. Dij) 25°, west. 



30. Unexposed space, 50 to 75 yards. 



31. Dark drab, fragmentary, spar-seamed limestone, 15 feet exposed. 

 Dip 32°, W. 5° S. 



32. Unexposed space, 30 to 50 yards. 



33. Blue, drab-mottled, rather even-bedded limestone, like Xo. 31, con- 

 taining Ostrea strigulecula {f). This ledge here makes a slight fold or 

 wrinkle, gently inclined on the south west, but more steeply pitching on 



