308 



ANNUAL REPORT SMITHSONIAN INSTITUTION, 1912. 



the deforming force had migrated slowly northward, following the 

 retreat of the ice front. 



LAKE LUNDY (LAKE DANA, LAKE ELKTON.) 



When the waters fell from the level of Lake Warren they halted fii^st 

 at the Grassmere beach and later at the Elkton beach, before the final 



