What Great Lakes sinkholes reveal about their ancient past
October 19, 2026
October 19, 2026
EAST LANSING, Michigan, Oct. 19 -- Michigan State University posted the following news:
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What Great Lakes sinkholes reveal about their ancient past
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A story is hidden in the muddy floor of the Great Lakes.
The layers of rock, minerals and clay are the archives of North American history. They contain traces of the waters before major human impacts. Their chemical signatures reveal the drastic changes that occurred as agricultu . . .
* * *
What Great Lakes sinkholes reveal about their ancient past
*
A story is hidden in the muddy floor of the Great Lakes.
The layers of rock, minerals and clay are the archives of North American history. They contain traces of the waters before major human impacts. Their chemical signatures reveal the drastic changes that occurred as agricultu . . .