Fur Formation
| Fur Formation | |
|---|---|
| Stratigraphic range: Ypresian ~ | |
 Coastal cliff on the Danish island Fur - Mo-clay and ash layers | |
| Type | Geological formation |
| Sub-units | See: Members |
| Underlies | Røsnes Ler |
| Overlies | Holmehus Formation |
| Thickness | 60 metres (200 ft) |
| Lithology | |
| Primary | Diatomite |
| Location | |
| Coordinates | 56°50′16″N 8°57′43″E / 56.83778°N 8.96194°E |
| Country | Denmark |
| Type section | |
| Named for | Fur |
| Official name | Knudeklint |
| Part of | The Bony Fish Fossils of the Western Limfjord – Evolution and Climate Adaptation in the Earliest Eocene |
| Criteria | Natural: viii |
| Reference | 1758 |
| Inscription | 2026 (48th Session) |
The Fur Formation is a marine geological formation of Ypresian (Lower Eocene Epoch, c. 56.0-54.5 Ma) age which crops out in the Limfjord region of northern Denmark from Silstrup via Mors and Fur to Ertebølle, and can be seen in many cliffs and quarries in the area. The Diatomite Cliffs (moler in Danish) became a World Heritage Site in 2026. Fossils found in the Fur Formation are primarily housed at the Fossil and Mo-clay Museum on Mors Island, the Fur Museum on Fur Island, and the Natural History Museum of Denmark (formerly named Geological Museum) in Copenhagen.