| Bobcaygeon Formation | |
|---|---|
| Stratigraphic range: | |
 Bobcaygeon Formation outcropping in Fenelon Falls. | |
| Type | Formation |
| Unit of | Simcoe Group |
| Sub-units | Three members (units C, D, and E) |
| Underlies | Verulam Formation |
| Overlies | Gull River Formation |
| Thickness | Up to 91 metres (300 ft) |
| Lithology | |
| Primary | Limestone |
| Location | |
| Region | Ontario |
| Country | Canada |
| Type section | |
| Named for | Bobcaygeon |
| Named by | B.A. Liberty |
| Year defined | 1969 |
The Bobcaygeon Formation is a geologic formation in Ontario. It preserves fossils dating back to the Ordovician period.