| Potrerillos Formation | |
| Type: | Formation |
| Period: | Paleocene |
| Age: | Maastrichtian-Early Paleocene ~ |
| Prilithology: | Mudstone |
| Otherlithology: | Grainstone |
| Region: | Coahuila |
| Coordinates: | 26°N -100.8°W |
| Paleocoordinates: | 31.7°N -82.7°W |
| Unitof: | Difunta Group |
| Subunits: | Upper Mudstone member |
The Potrerillos Formation is a geologic formation in Mexico. It preserves fossils dating back to the Early Paleocene period.[1]
The Potrerillos Formation was subdivided into five members by McBride (1974), with the second highest, the Upper Mudstone Member. Foraminifera in the lower members indicate a Maastrichtian age, while fossils in the upper members indicate a Paleocene age. Fossil remains are abundant and include transported remains of corals, gastropods, bivalves, shark teeth, and bone fragments.[1]
The following fossils have been reported from the formation:[1]