43 2 



CHARLES S. PROSSER 



is well exposed about one and one-half miles farther up the river and 

 about one-half mile south of the Lewis Center road, in a run on the 

 farm of Mrs. Amelia Case, a view of which is given in Fig. 2. 



Professor Winchell in the Delaware County report described an 

 exposure in the southern part of the county, under the heading of a 

 "Section through the Olentangy Shale and Hamilton Limestone, 

 Five and a Half Miles below Stratford." 1 Professor Winchell 



Fig. 2. — View of the zone of alternating limestone and chert in the lower Delaware 

 on the farm of Mrs. Amelia Case. 



described a small quarry not far below the ravine of his section, and 

 such an abandoned quarry and river bluff occur a few rods south 

 of Deep Run; so it is believed that the localities are identical. Pro- 

 fessor Winchell gave the thickness of the Olentangy shale as thirty 

 feet, which is probably not greater than its true thickness in this glen, 

 and the combined thickness of what he called the Tully limestone ( ?) 

 and Hamilton ( ?) (our Delaware limestone) as thirty-seven feet, 

 with seventeen feet of Corniferous (Columbus) limestone below. 



1 Report of the Geological Survey oj Ohio, Vol. II, Part I (1S74), p. 293. 



