| Collingwood Shale | |
|---|---|
| Stratigraphic range: Middle Ordovician | |
| Type | Formation |
| Underlies | Bill's Creek Shale |
| Overlies | Trenton Formation |
| Location | |
| Region |  Michigan |
| Country |  United States |
The Collingwood Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period.