628 



THE ICE AGE IN NORTH AMERICA. 



after working it up and down a few times, so as to loosen the 

 gravel about it, I drew out the implement now exhibited. 



w 



Fig. 161.— Argillite implement found by Dr. C. C. Abbott, March, 1879, at A. K. Rowan's 

 farm, Trenton, New Jersey, in gravel sixteen feet from surface, a, face view ; b, 

 side view. (No. 11,286.) (Putnam.) 



On the same day I discovered a second specimen in place 

 eight feet from the surface, and Dr. Abbott's son Richard 

 found another about four feet from the surface. These three 

 specimens were found within twenty or thirty feet of each 

 other, after a heavy shower had made the most favorable con- 

 ditions for their discovery. 



My own first visit to the locality was in November, 1880, 

 in company with Professors W. Boyd Dawkins, Henry W. 

 Haynes, and H. Carvill Lewis, when we were conducted by 

 Dr. Abbott to the various localities favorable for investiga- 

 tion. Professor Lewis and myself also repeatedly visited the 



