14500 14000
13600 13200
12900 12700
12500 12200
12000 11800
11500 11200
10900 10600
10300 10000
09500 09000
08700 08400
08200 08100
07500 06000
Return to Great Lakes History menu
View previous map - 10300 years
View next map - 9500 years
Return to Physical Geology-Glaciers
Return to Professor Dutch's Home Page
Last Update 27 March 1997