| Calcaire de Cognac | |
| Type: | Geological formation |
| Age: | Maastrichtian, |
| Period: | Maastrichtian |
| Prilithology: | Clay, shale |
| Otherlithology: | Sandstone |
| Region: | Provence-Alpes-Cote d'Azur, Bouches-du-Rhône |
| Coordinates: | 43.5°N 5.5°W |
| Paleocoordinates: | 36.1°N 4°W |
| Overlies: | Argiles et Grès à Reptiles Formation |
| Thickness: | Over 40m (130feet) |
| Extent: | Aix-en-Provence Basin |
The Calcaire de Rognac is a geologic formation in France. It preserves fossils dating back to the Maastrichtian stage of the Late Cretaceous period and possibly also sometime during the Tertiary period. It is overlain by the Argiles et Grès à Reptiles Formation.