5J: ANNALS NEW YORK ACADEMY OF SCIENCES 



bone level at this point is 20 feet or so below that of the other Cope quarry 



to the west. It is much higher than the bone level in the Marsh-Hatcher 



quarry. From the summit of the "Nipple" to the base of the clifE a 



complete section from the base of the Purgatoire to the upper members 



of the Eed Bed series is exposed. 



A section from the summit of the "Nipple" to the uppermost beds of 



the Eed Bed series is as follows : 



Feet Inches 



1. At the summit of the "Nipple" and about 25 feet above the top 



of the clifC, white sandstone of the Purgatoire series 1 



2. Brown joint-clay 4 



3. Brown nodules 4 



4. Brown clay 15 



5. Gray clay (at the top of the cliff, contains dinosaur bones and 



is the productive bed of the above-mentioned Cope quarry) . 5 2 



6. Sandstone 1 



7. Clay 1 



8. (o, 1), c) Clay, nodules and clay 3 



9. Variegated claj^ 9 6 



10. Sandstone 4 



11. Clay 6 .. 



12. Sandstone 3 



13. Variegated clay, gray, purple and greeu^ 204 



14. Cross-bedded sandstone 8 



15. Clay 1 



16. Sandstone 1 to 6 



17. Clay 6 



18. Sandstone 1 



19. Clay 40 



20. Sandstone 1 



21. Clay 8 . . 



22. Sandstone 1 



23. Clay 2 .. 



24. Sandstone 1 



Total , 319 1 



to 

 319 7 



25. Arkosic conglomerate. This conglomerate is here considered as belonging 



to the underlying Red Bed series, though it is possible that it may be 

 the basal member of the Morrison formation. In the latter case the 

 thickness of the formation would be increased by 40 or 50 feet. 



The contact with the underlying beds is very indistinct, and the pres- 

 ence of an erosion interval between the Morrison and these underlying 

 beds cannot be determined from the outcrops alone. 



2 The outcrop of this clay series is covered in many places with a thin clay talus, 

 which may conceal some thin beds of limestone or nodules. 



