Grand River Formation Explained

Grand River Formation
Type:	Formation
Age:	Pennsylvanian
Period:	Pennsylvanian
Underlies:	Ionia Formation
Overlies:	Saginaw Formation

The Grand River Formation is a geologic formation in Michigan. It preserves fossils dating back to the Pennsylvanian period.

References

• Web site: Fossilworks: Gateway to the Paleobiology Database. ((Various Contributors to the Paleobiology Database)). 17 December 2021. 25 March 2022. https://web.archive.org/web/20220325060448/http://www.fossilworks.org/cgi-bin/bridge.pl?action=home. live.