Devonian Shales of Ohio and Pennsylvania. 



35 



The base may also be the locus of a clisconformitj which is 

 suggested by a rather abrupt faunal change and also by the 

 discrepancy in thickness of the shales below as they are traced 

 toward the east. In figure 1 the varying nature and thickness 

 is shown from the Huron Kiver to Ashtabula County in Ohio 

 which marks the easternmost limit of the formation. Since it 

 thins thus noticeably toward the east, it has been suggested that 



Fig. 1. 



H 



Bete, Ob 



BeA^-otcl 

 i-eSa. 



-^ 



^, 



m 





|V 



A^ 









.•:■:''-■-.:■ 





IS 





3z: 





-^ ^ 



-^ZX e,q^ _ 





._Sa. --. 









r"r-3> 



-I^'e" 





r'-:->-;v2 



^\^^<^^ 



-i-:-.---Vr 



_Si^^' ' 



WM 









.\ 



:^-f- 





__o^— - 



^Ai\ 













de, u e. L and/ 



3> 



^z^ 



Ckc 



jiiEAU£ia_^ TRUMBULL 



ITOBTflCLEt 



Fig. 1. Sections showing the Bedford and Cleveland formations across 

 northern Ohio from west to east. 



a land mass probably existed near the borderline of Ohio and 

 Pennsylvania toward the close of the Devonian and that the 

 Bedford overlaps upon this (Dr. Ulrich and others). However, 

 other evidence that should be present to substantiate this is 

 lacking. The lithologic character of the formation does not 

 indicate near shore conditions in this direction, nor is there any 

 indication of this in the dip of the rocks further east. There 

 is unfortunately a gap in exposures for some distance on both 



