Long Lake Limestone - English Wikipedia @ Freddythechick

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The Long Lake Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.

Long Lake Limestone
Stratigraphic range: Middle Devonian
Type	Formation
Unit of	Traverse Group
Sub-units	Killians Member and Genshaw Member
Underlies	Alpena Limestone
Overlies	Ferron Point Formation
Location
Region	Michigan
Country	United States

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References

Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.

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