STRATIGRAPHY OF OHIO WAVERLY FORMATIONS 659 



the Waverly for forty years. When the errors of interpretation and 

 correlation of various geologists during this length of time are 

 resolved out, it is peculiar that, after all the different applications 

 that have been made of these names, it should now fall to them to 

 denote precisely the same beds that they were originally applied 

 to forty years ago, or, as nearly as can be determined, the central 

 Ohio equivalents of these beds. The subdivisions of the Logan 

 here adopted constitute exactly the Logan formation at Logan, the 

 locality from which E. B. Andrews named it in 1870, since when the 



TABLE II 



Proposed Classification 



Prosser 





Vinton member 



Logan formation 



Logan 



Allensville member 



Conglomerate II 





formation 



Allerisma shale 







,Byer member 





, Black Hand 

 f formation 





Berne member 



Conglomerate I 





Cuyahoga J 



Black Hand member 









Raccoon shales, only a 

 few feet exposed 



Cuyahoga 

 formation 



name Logan has been used with precisely the same meaning 

 by no other writer. The Cuyahoga was named from outcrops on 

 the Cuyahoga River in northern Ohio where it is overlain by the 

 Pennsylvanian, the whole of the Logan and some of the Cuyahoga 

 having been removed by pre-Pennsylvanian erosion. It is not, 

 at present, possible to demonstrate that the beds to which the name 

 Cuyahoga is here applied are the precise equivalent of the beds 

 in the type section; but it is now evident that they are almost or 

 quite identical with those shales in the shale facies in central Ohio 

 which Orton knew lay between the Berea Grit and the Logan, 

 which he called Cuyahoga, but of which he never fixed the precise 

 limits. 



This does not imply that any of these workers understood the 

 true relationships. They did not; none of them knew that the 

 Black Hand (or Waverly conglomerate as it was called) and the 

 underlying coarse sandstones (which indeed were practically 



