| Mercedes Formation | |
| Type: | Geological formation |
| Period: | Maastrichtian |
| Age: | Campanian-Maastrichtian ~ |
| Prilithology: | Sandstone |
| Namedfor: | Mercedes, Uruguay |
| Region: | Río Negro & Soriano Departments |
| Coordinates: | -33.4°N -58.3°W |
| Paleocoordinates: | -37.3°N -41.4°W |
| Underlies: | Asencio Formation |
| Overlies: | Guichón Formation |
| Extent: | Norte Basin |
The Mercedes Formation is a Late Cretaceous (Campanian to Maastrichtian) geologic formation of the Norte Basin in Uruguay. Fossil dinosaur eggs have been reported from the formation.[1] The formation that reaches a thickness of about 100m (300feet),[2] overlies the Guichón Formation and is overlain by the Asencio Formation.[3]