| Paso del Sapo Formation | |
| Type: | Geological formation |
| Period: | Maastrichtian |
| Age: | Maastrichtian ~ |
| Prilithology: | Siltstone |
| Namedfor: | Paso del Sapo |
| Region: | Chubut Province |
| Country: | Argentina |
| Coordinates: | -42.7°N -70°W |
| Paleocoordinates: | -44.9°N -58.5°W |
| Underlies: | La Colonia & Lefipán Formations |
| Overlies: | Cerro Barcino Formation |
| Extent: | Cañadón Asfalto Basin |
The Paso del Sapo Formation is a Maastrichtian geologic formation of the Cañadón Asfalto Basin in Argentina. The siltstones of the formation were deposited in a lacustrine environment. Plesiosaur remains are among the fossils that have been recovered from its strata.