Groos Quarry Formation
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| Groos Quarry Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Unit of | Trenton Group |
| Location | |
| Region | Michigan |
| Country | United States |
The Groos Quarry Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period.
