| Lucas Formation | |
|---|---|
| Stratigraphic range: Middle Devonian | |
_5_(48904937882).jpg) 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.