| Nyker Group | |
| Age: | Latest Jurassic-Early Cretaceous ~ |
| Period: | Early Cretaceous |
| Subunits: | Rabekke, Robbedale & Jydegaard Formations |
| Overlies: | Bagå Formation |
| Underlies: | Arnager Greensand Formation |
| Type: | Geological unit |
| Lithology: | Claystone, sandstone |
| Region: | Bornholm |
The Nyker Group is a group of geological formations from the Early Cretaceous, about 146 to 140 million years ago. It is on the island of Bornholm, Denmark. It includes the Rabekke, Robbedale and Jydegaard Formations.[1]
See main article: article and Rabekke Formation. The Rabekke Formation is the lowermost formation of the Nyker Group. It dates to about 146 to 145 million years ago, at the Jurassic-Cretaceous boundary. The formation has the significance of having the first Scandinavian mammal, Sunnyodon notleyi, uncovered from it. Many crocodilomorphs and other vertebrates have been recovered from it.
See main article: article and Robbedale Formation. The Robbedale Formation is the middle formation of the Nyker Group. It dates to about 145 million years ago. No vertebrate fossils have been recovered from the formation.[1]
See main article: article and Jydegaard Formation. The Jydegaard Formation is the uppermost formation of the Nyker Group. It dates to around 145 to 140 million years ago. The first dinosaur found on Denmark, Dromaeosauroides bornholmensis, was discovered in this formation.[1] Many vertebrates have been recovered from it.[2]