ANCIENT MAN IN NORTH AMERICA 277 
fourteen thousand years may have elapsed since the 
deposition of the Trenton gravels. Professor Chamber- 
lin, on the other hand, regards the " Wisconsin " 
phase as having reached its climax twenty thousand 
or even sixty thousand years ago. If the deposition of 
the Trenton gravels preceded the " Wisconsin " glacia- 
tion, then a greater age than fourteen thousand years must 
Flc. 93. — Drawing of a skull of an American Indian on which the cranial 
fragment found at Trenton is represented. 
be assigned to these human fragments. If the glacia- 
tions of Europe jnd North America occurred at the same 
time — which is an unproved, but not improbable sup- 
position — then the last or " Wisconsin " phase of the one 
and the last or " Warmien " phase of the other would 
correspond. We have seen that before the last glacial 
phase in Europe occurred, mankind in the eastern hemi- 
sphere had entered on the Aurignacian stage of culture. 
