| Lucas Formation | |
|---|---|
| Stratigraphic range: Middle Devonian | |
 Lucas Dolomite (Middle Devonian; quarry near Junction, Ohio) | |
| Type | Formation |
| Unit of | Detroit River Group |
| Underlies | Anderdon Limestone and Dundee Formation |
| Overlies | Amherstburg Formation |
| Location | |
| Region | Michigan and Ohio |
| Country | United States |
The Lucas Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
| Cnidarians | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Siphonophrentis | S. gigantea | [1] | A coral |  | |
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The Silica Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
The Alpena Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
The Cordell Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
The Pointe aux Chenes Formation is a geologic formation in Michigan, USA. It preserves fossils dating back to the Silurian period.
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The Stonington Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period.
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The Lime Island Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
The Hendricks Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
The Rockview Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
The Rapson Creek Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
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