Trenton Group
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.
| Trenton Formation | |
|---|---|
| Stratigraphic range: Middle-Upper Ordovician | |
Trenton Formation in Canada | |
| Type | Formation |
| Sub-units |
|
| 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 |
| Country | United States Canada |
| Extent | Appalachia, Midwestern and Southeastern United States |
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