THE DELAWARE LIMESTONE 1 



CHARLES S. PROSSER 

 Ohio State University 



CONTENTS 



Historical Review. 



Description of the Delaware Limestone. 



Slate Run section. 



Deep Run section. 

 The Sandusky Limestone. 



Lake Shore & Michigan Southern Railroad quarry. 



Schoepfle & Son's quarry. 



Correlation of limestone in and near Sandusky. 



HISTORICAL REVIEW 



The division and correlation of the Devonian limestones of Ohio 

 have been a subject of consideration by geologists for many years, 

 and there have been decided differences of opinion. Recently Dr. 

 Charles K. Swartz, of Johns Hopkins University, and the writer 

 have studied these limestones, in the main working independently, 

 but arriving at quite similar general conclusions. The following 

 rather brief chronological review of the most important opinions 

 will probably acquaint the reader with an outline of the subject 

 under consideration. 



In 1838 Professor Locke adopted the name "Cliff limestone" 

 "for the very extensive deposit of limestone above the blue lime- 

 stone" 2 (the latter limestone he described as alternating with layers 

 of marl in southwestern Ohio, and it belongs in what is now known 

 as the Cincinnatian series). In 1842 Dr. A. Clapp, in describing 

 the rocks at the Falls of the Ohio and vicinity, stated that "under 

 the name Cliff limestone is here included all the group above the 

 blue limestone and marls of Cincinnati, to the black slate." 3 The 



1 Published by permission of Edward Orton, Jr., state geologist of Ohio. 



2 Second Annual Report oj the Geological Survey of Ohio, p. 211. 



3 Proceedings of the Academy oj Natural Science, Philadelphia, Vol. I, p. 178. 



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