identify kind of rocks

Reply Wed 23 Mar, 2016 12:16 pm
From the city of Milwaukee looking at the Lake Michigan shoreline there are big boulders and rocks. I am wondering what they are called and their history in the geological evolution of Wisconsin. They look like they may be granite, but I don't know.
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Reply Wed 23 Mar, 2016 01:11 pm
Geo, wonder if you could provide a link
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Reply Wed 23 Mar, 2016 02:03 pm
Any big boulders near Lake Michigan which haven't been moved by technology are probably glacial erratics. Normally these are granite from northern mountains.
Reply Wed 23 Mar, 2016 02:41 pm
Get a glacial history map of Lake Michigan. The two glqciql lobes, The Green Bqy lobe and the Lqke Michigqn lobe are probably the source rocks for the erratics you see on the shore.
The bedrock geology of the Milwaukee area is mostly carbonates so its probable that those rocks have been eroded and piled on by a moraine of gneiss and grnites(bot of which are found in the Sudbury geo province from NW Wisconsin all the way NE.

You have enough to figure it out with a state geological (bbedrock and glcial mp)
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