188 GEOLOGY OF THE EUEEKA DISTRICT. 



Feet. 



15. Yellow to buff saudy shales 40 



16. Bluish black, hard, compact limestone 12 



Fragments of fossils. 



17. Shaly sandstone in massive layers 52 



18. Gray arenaceous limestone 2 



19. (a) Buff sandy shale 40 



(b) Gray arenaceous limestone 30 



(c) Sandy calcareous shale 3 



73 



20. (a) Massive bedded bluish gray limestone 200 



Fragments of fossils. 



(b) Comj)act gray sihceous limestone, almost quartzite in places 400 



(c) Bluish black evenly bedded limestone 6 



606 



Strike N. 30° W., dip 10° E. 



21. Buff to pinlush argillaceous shale, with fossils, and a few interbedded 



layers of limestone from 3 to 15 inches thick 125 



Fossils: Eocystitesff longidactylus, Lingulella ella, Kutorginapannula, 

 Hyolithes hUlingsi, Ptychoparia piochensis, OJenoides typicalis, 

 Bathyuriscits liowelli, and B. producta. 



22. Massive bedded siliceons limestone, weathering rough and broken into 



great belts 200 to 300 feet thick by bands of color in light gray, dark 

 lead, to bluish black ; on some of the cliff' faces the weathered surface 

 is reddish 1, 570 



23. Bluish black limestone in massive strata that break up into shaly layers 



on exposure to the weather. The latter featm-e is less distinct 850 feet 

 up, and the limestone becomes more siliceous, with occasional shaly 



beds - 1, 430 



Fossils : Near the summit specimens were found that are referred to 

 Ptychoparia minor. 



The upper limestoue on the line of the section is not favorable for the 

 preservation of organic remains, but the same horizon a short distance to 

 the southward yielded a fauna similar to that from the Upper Cambrian at 

 Eureka, two species being- identically the same, while two others, Beller- 

 opJion antiquatus and DiceUocephalus pepinensis, occm- in the Potsdam sand- 

 stone of Wisconsin. 



Timpahute Range.— Mr. G. K. Gilbert reports from the southern end of 

 Timpahute Range a section over 2,300 feet in thickness, which, taken 



