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Old 01-05-2012, 05:58 PM
 
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i read that the large hill on La Grange rd south of cal sag rd was formed during the ice age. i read that its what is considered the real Moraine valley. So does that mean that the entire southwest side of the city and suburbs was covered with water all the way up to the present lake michigan boundaries? What explains the large land dip in the Dan Ryan woods?
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Old 01-05-2012, 06:09 PM
 
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Here is a good starting point for the prehistoric geology of the region: Lake Chicago - Wikipedia, the free encyclopedia
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