| Bobcaygeon Formation | |
| Type: | Formation |
| Period: | Late Ordovician |
| Prilithology: | Limestone |
| Namedfor: | Bobcaygeon |
| Namedby: | B.A. Liberty |
| Year Ts: | 1969 |
| Region: | Ontario |
| Country: | Canada |
| Unitof: | Simcoe Group |
| Subunits: | Three members (units C, D, and E) |
| Underlies: | Verulam Formation |
| Overlies: | Gull River Formation |
| Thickness: | Up to 91m (299feet) |
The Bobcaygeon Formation is a geologic formation in Ontario. It preserves fossils dating back to the Ordovician period.