628 THE JOURNAL OF GEOLOGY. 



here, therefore, appear to be essentially the same as on other 

 tributaries of the region which are crossed by the group of later 

 moraines, and which seem to indicate profound excavation 

 between the earlier and later drifts. 



The hypothesis advanced in the paper, while not new in 

 itself, having been among the multiple working hypotheses used 

 by one or more students of the region, though not so far as 

 known adopted by any one previously, is much more deserving of 

 serious consideration than its predecessor, the Cincinnati ice dam. 

 It may have some elements of truth in it, i. e., a portion of the 

 excavation of the rock below the old base-plane may have pre- 

 ceded the incursion of the glacial wash and even the glacial 

 period. If this should prove true the effect will be to extend 

 the importance of the earlier glacial epoch and to reduce the 

 time necessarily attributed to the interglacial interval of excava- 

 tion. The glacial formations of the lower Ohio and adjacent 

 regions, however, seem to indicate a more complex hypothesis 

 than this, or any previously advanced, which shall take cognizance 

 of more than one glacial episode previous to the formation of the 

 well-developed terminal moraines. 



* * 



One session of the Geological Section was adjourned to 

 permit members to listen to papers read before the Anthropo- 

 logical Section having a geological bearing. These were the 

 "Evidence of Glacial Man in America," by G. Frederick Wright; 

 and "The Antiquity of Man in America," by W J McGee. 

 The former consisted essentially of a restatement of the sup- 

 posed evidences of the existence of man contemporaneously 

 with the glacial period found in the terraces at Madisonville and 

 Newcomerstown in Ohio, and at Trenton, N. J. The latter con- 

 sisted essentially of a discussion of the character of evidence 

 required for the establishment of the antiquity of man. 

 Emphasis was especially laid upon the distinction between legal 

 evidence and scientific evidence. 



In the first paper no new discoveries were announced nor 

 any additional data of note added to previous evidence. On 



