| Wilhelmøya Formation | |
| Type: | Formation |
| Age: | Rhaetian |
| Period: | Rhaetian |
| Prilithology: | Sandstone |
| Region: | Svalbard |
| Coordinates: | 78.9°N 28.2°W |
| Paleocoordinates: | 64.7°N -10°W |
| Unitof: | Kapp Toscana Group |
The Wilhelmøya Formation is a geologic formation in Svalbard, Norway. The marginal marine; concretionary, sideritic sandstones preserve indeterminate ichthyosaur and plesiosaur fossils dating back to the Rhaetian period.[1]