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The Lucas Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
The Rochester Shale is a geologic formation in West Virginia. It preserves fossils dating back to the Silurian period.
The Ohio Shale is a geologic formation in Ohio. It preserves fossils dating back to the Devonian period.
The Dundee Limestone is a geologic formation in Michigan, Ohio and Ontario. It preserves fossils dating back to the Devonian period.
The Lockport Dolomite is a geologic formation in Ohio. It preserves fossils dating back to the Silurian period.
The Amherstburg Formation is a geologic formation in Ontario, Canada and Michigan, United States. It preserves fossils dating back to the Devonian period.
The Manitoulin Dolomite is a geologic formation in Ontario. It preserves fossils dating back to the Silurian period.
The Alzey Formation is a geologic formation in Germany. It preserves fossils dating back to the Paleogene period.
The Cabot Head Shale is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
The Bois Blanc Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
The Sunbury Shale is a geologic formation in Michigan. It preserves fossils dating back to the Mississippian period.