| Grabenbach Formation | |
| Type: | Formation |
| Period: | Santonian |
| Prilithology: | Shale |
| Region: | Central Europe |
| Country: | Austria |
| Unitof: | Gosau Group |
| Underlies: | Hochmoos Formation |
| Overlies: | Streiteck Formation, Noth Formation |
The Grabenbach Formation is a geologic formation in Austria. It preserves fossils dated to the Santonian of the Cretaceous period.