Groos Quarry Formation

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.

• List of fossiliferous stratigraphic units in Michigan

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 25 March 2022. Retrieved 17 December 2021.