Trenton Formation
Stratigraphic range: Middle-Upper Ordovician
Trenton Formation in Canada
Type	Formation
Sub-units	Dolgeville Limestone Flat Creek Member Kings Falls Limestone Glens Falls Limestone Sugar River Limestone Denley Limestone Steuben Limestone
Underlies	Collingwood Shale, Point Pleasant Formation & Scales Shale
Overlies	Black River & Plattin Formation
Lithology
Primary	Limestone
Other	Chert
Location
Region	Indiana, Michigan, Ohio, and Virginia[1]
Country	United States  Canada
Extent	Appalachia, Midwestern and Southeastern United States

The Trenton Group is a geologic unit in Canada and Michigan, Ohio, New York State and Indiana, Pennsylvania, and West Virginia in the United States. It dates back to the Ordovician period.^[2][3]

• List of fossiliferous stratigraphic units in Michigan
• Trenton Gas Field
• Indiana gas boom
• Petroleum industry in Ohio

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 22 June 2014.

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