72 



MAN AND THE GLACIAL PERIOD. 



identified, as from well-known trap-dykes, sixteen miles 

 or more to the north. The so-called Judge's Cave, on 

 West Eock, 365 feet above the adjoining valley and 

 weighing a thousand tons, is one of these. Professor Ed- 



Fig. 26.— Mohegan Rock. 



ward Orton * describes a mass of Clinton limestone near 

 Freeport, Warren County, Ohio, as covering an area of 

 three-fourths of an acre, and as sixteen feet in thickness. 

 It overlies glacial clays and gravels, and must have been 

 transported bodily from the elevations containing this 

 rock several miles to the northwest. 



Geological Survey of Ohio, vol. iii, p. 385, 



