In quarries near Alpena sediments from the Devonian period are exposed. These sediments are known for its beautiful crinoid fossils. There are several quarries in the area, under which the closed Thunder Bay Quarry.
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Alpena is located in the east of the state of Michigan, in the north of the US.
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Crinoids and rugose corals.
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Other locations in the area
Fossil location: Petoskey (Alpena)
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