| Black River Formation | |
| Type: | Formation |
| Age: | Middle Ordovician |
| Period: | Middle Ordovician |
| Region: | Quebec and Michigan |
| Country: | Canada and the United States |
| Underlies: | Trenton Formation |
| Overlies: | Au Train Formation |
The Black River Formation is a geologic formation in Quebec, Canada and Michigan, United States. It preserves fossils dating back to the Ordovician period.