COW CREEK SECTION. 39 



Feet. Inches. 



5. Dark blue to drab calcareous shale, abundantly fossiliferous, 



containing all Snyder Creek species of Slropheodonta 1 4 



6. Interval 3 



7. Dark blue to drab calcareous shale, all of Snyder Creek Slropheo- 



donta species abundant, Lioclema occidens (Hall and Whitfield) 



abundant 1 1 



8. Interval, covered 3 6 



9. Dark blue to drab calcareous shale, containing all of the Snyder 



Creek species of Stropheodonta in abundance and many large 



specimens of Orthoceras 2 7 



Total Snyder Creek measured 22 9 



In this section it is impossible to determine the Snyder 

 Creek-Callaway contact owing to the exposures being scattered 

 for about one mile along the stream course. Below number 9 

 are thin beds of limestone and a sandstone which ranges up to 

 five or six feet in thickness, but it was not determined whether 

 the limestone and sandstone belong to the Callaway or Snyder 

 Creek. 



On Cow Creek, Sec. 23, T. 47 N., R. 8 W., the following 

 section is exposed: 



Feet. Inches. 

 Burlington 



Brown limestone which grades above into weathered materials. 

 Unconformity 

 Sylamore sandstone 



Green and brown sandstone 1 



Unconformity 

 Snyder Creek shale 



1. Brown sandy limestone 1 - 6 



2. Highly fossiliferous brown sandy limestone, containing a great 



many Stropheodonta demissa (Conrad) 1 



3. Brown sandy, calcareous shale containing many Spirifer euryteines 



Owen near the bottom 4 



4. Fossiliferous bluish-gray limestone, crowded with Spirifer eury- 



teines Owen, Stropheodontas and Schizophorias 10 



5. Blue shale, not well bedded, yields many pelecypods 3 



The section is incomplete as number 5 ends in the bottom of 

 the stream. About two miles down stream the shales are 50 

 feet thick, and the details of the shales at that place are given 

 below: 



COW CREEK SECTION OF THE SNYDER CREEK SHALE 



The thickest section of Snyder Creek shale known to the 

 writer is near the mouth of Cow Creek in Sees. 22 and 27, T. 

 47 N., R. 8 W. Owing to the nature of the shale the sections 

 are not all exposed but almost complete sections were obtained 

 by removing mantle rock from some surfaces. 



