| San Juan Formation | |
| Type: | Formation |
| Age: | Lutetian |
| Period: | Lutetian |
| Prilithology: | Limestone |
| Region: | Chiapas |
| Coordinates: | 16.7°N -93.1°W |
| Paleocoordinates: | 18.5°N -83.8°W |
| Unitof: | La Esperanza Group |
The San Juan Formation is a geologic formation in Mexico. It preserves fossil corals dating back to the Lutetian stage of the Paleogene period.[1]