This map shows the different kinds of bedrock
in Michigan. Bedrock influenced ice movement during past glaciations, and most of Michigan
is on soft bedrock that was easy for the glacier to move through and grind away. Because
of this, most bedrock in Michigan is deeply buried beneath glacial material. One place
where bedrock is close to the surface and strongly influences ecosystems is in the
Niagaran formation along the southern edge of Upper Michigan. Niagaran bedrock outcrops
are often associated with the occurrence of rare species. Data sources are the
1:500,000 maps by R.L. Milstein, 1987, "Bedrock geology of southern Michigan",
and R.C. Reed, "Bedrock geology of southern Michigan", published by the Michigan
Department of Natural Resources.
The following higher resolution version of the above map may be viewed by clicking the link below.
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