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There are no Precambrian rocks exposed at the surface in Illinois. Precambrian rocks in the subsurface are mostly volcanic and granitic intrusions, and thus do not contain fossils.
Education and Exhibits
Virtual Exhibits (showing 1 of 1 listings) First Families of Chicago: Local geology of the Chicago, Illinois, area, complete with descriptions of the fossils found there. Top of List
Virtual Exhibits (showing 1 of 1 listings)
First Families of Chicago: Local geology of the Chicago, Illinois, area, complete with descriptions of the fossils found there.
Top of List
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