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History
Four Mile Dam Formation
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The Four Mile Dam Formation, also called the Four Mile Dam Limestone, is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.
Image: Phacops rana
Image: Phacops rana
Norway Point Formation
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The Norway Point Formation is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.
Image: Dipleura dekayi 2
Image: Dipleura dekayi 2
Image: Phacops rana
Image: Phacops rana