| 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 U.S states of Michigan and Ohio. It preserves fossils dating back to the middle Devonian period.
| Cnidarians | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Siphonophrentis | S. gigantea | [1] | A coral |  | |
The Bass Islands Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
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 Pointe aux Chenes Formation is a geologic formation in Michigan, USA. It preserves fossils dating back to the Silurian period.
The Collingwood Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period.
The Stonington Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period.
The Sylvania Sandstone is a geologic formation in Ohio and Michigan. Its type locality is Sylvania, Ohio. It preserves fossils dating back to the Devonian 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 Au Train Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period.
The Big Hill Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period. A fossiliferous site on the Stonington Peninsula includes a dolomite bed of the Big Hill Formation which has abundant and well-preserved fossils. The most common fossils are soft-bodied medusae (jellyfish), followed by linguloid brachiopods, algae, and arthropods. This site is considered a Konservat-Lagerstätte, and is commonly referred to as the Big Hill Lagerstätte or Big Hill Biota.
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.
The Bush Bay Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
The Garden Island Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
The Bois Blanc Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
The Squaw Bay Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period. The ammonoid Koenenites has been found in this formation.
The Ellsworth Shale is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
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The Ionia Formation is a geologic formation in Michigan. It preserves fossils dating back to the Jurassic period.
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