﻿NO. 20 



RECOGNITION OF PLEISTOCENE FAUNAS HAY 



Prof. D. W. Dennis, certainly came from post-Wisconsin deposits, 

 while the Youngstown, Ohio, specimen was found within the area 

 of the Wisconsin drift-sheet. Specimens of Symbos cavifrons are 

 most numerous, and several of these are found above Wisconsin 

 drift, especially in Indiana. 



The next map (fig. 7) shows the distribution of the great eden- 

 tates, belonging mostly to the genera Megatherium, Mylodon, 

 Paramylodon, and Megalonyx. It will be observed that the locali- 

 ties lie almost wholly south of the border of the Wisconsin drift. 

 However, there is in the collection of the Ohio State University 

 a mounted skeleton, to a considerable extent restored, which was 



Fig. 7. — Distribution of Pleistocene gigantic edentates. 



discovered several years ago, near Millersburg, Holmes County, 

 Ohio. Here the terminal moraine of the Wisconsin ice-sheet had 

 dammed back the water, and formed north of it a lake that eventu- 

 ally became a marsh, and in this, about a mile north of the moraine, 

 was found a part of the skeleton of Megalonyx jeffersonii. This 

 existence of Megalonyx after the Wisconsin ice had withdrawn 

 from the Great Lakes region, is confirmed by the finding of a claw 

 of probably the same species above Wisconsin drift near Cham- 

 paign, Illinois. None of the other genera of this order has yet been 

 found at so high a geological level in the glaciated region. 



These maps, therefore, furnish us with incontestable evidence, 

 that, after the passing away of the last glacial ice-sheet and yet 

 within Pleistocene time, the country had become fitted for animal 



