ga 
LITERATURE CITED. 67 
WoopwortH, J. B. 
Ancient water levels of the Champlain and Hudson valleys. Bull. 84, N. Y. state mus., 
1905. 
See SHaLer, N. S., WoopwortH, J. B., and Marsur, C. F. 
Wricat, G. F. 
The ice age in North America. Third edition. New York. 1891. : 
Age of the Don River glacial deposits, Toronto, Ontario. Bull. Geol. soc. Amer., 1914, 
25, p. 205-214. 
