ice-bdy-10-5k.GIF (76696 bytes)


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GlacialLkLegend.jpg (46215 bytes) LEGEND


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dg-43.GIF (97748 bytes)

Glacial Lake Algonquin inundated most of the eastern and southern UP, as well as parts of the northern lower peninsula.  These areas were isostatically depressed, and were lower than the outlets of the lake---Chicago and Port Huron. 
dg-44.GIF (103976 bytes)

Below is a detailed map showing what Lake Algonquin and the surrounding landscapes probably looked like, some 10,800 years ago.  (Thanks for Scott Drzyzga, a Geography graduate student, for the map!)
mainalgonq-smaller.jpg (85611 bytes)

The two images below show wave-cut shorelines, or beach ridges, or Glacial Lake Algonquin, in the UP.  Note the boulders left behind by the crashing waves.
beach ridge.jpg (61624 bytes)

beach boulders.jpg (61814 bytes)

This material has been compiled for educational use only, and may not be reproduced without permission.  One copy may be printed for personal use.  Please contact Randall Schaetzl ( for more information or permissions.