Trenton Formation

Trenton Formation Stratigraphic range: Middle Ordovician
Type	Formation
Underlies	Collingwood Shale, Point Pleasant Formation, and Scales Shale
Overlies	Black River Formation and Plattin Formation
Location
Region	Indiana, Michigan
Country	United States

The Trenton Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period.