426 CHARLES S. PROSSER 



mile north of Dublin, in the northern part of Franklin County. 1 

 This region may, therefore, be considered as typical as that in the 

 vicinity of Delaware, and has the advantage of showing clearly in 

 several sections both the upper and lower limits of the formation. 

 It will be interesting, therefore, to describe somewhat carefully a 

 section to the south and another one to the north of the one described 

 by Dr. Orton. 



Fig. i. — Shale zone forming the lower part of the Delaware formation, as shown 

 on Slate Run. Its top is indicated by the hammer. 



SLATE RUN SECTION 



In Perry Township, on the eastern side of the Scioto River, three 

 and one-half miles north of Marble Cliff, is a locality known as Slate 

 Run Hollow, on the farm of Mr. George Matthews. The run is one 

 and one-half miles north of Fishinger's bridge, and about five and 

 one-half miles in a direct line northwest of the Ohio State University, 

 and in the lower part of the stream is the pond of the Columbus Fish- 



1 Dr. Orton named it the "section of Corniferous limestone near Corbin's mill 

 Perry Township," Vol. Ill, p. 604. 



