| Long Lake Limestone | |
| Type: | Formation |
| Age: | Middle Devonian |
| Period: | Middle Devonian |
| Unitof: | Traverse Group |
| Subunits: | Killians Member and Genshaw Member |
| Underlies: | Alpena Limestone |
| Overlies: | Ferron Point Formation |
The Long Lake Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.