Nyker Group
From Wikipedia, the free encyclopedia
| Nyker Group | |
|---|---|
| Stratigraphic range: Latest Jurassic-Early Cretaceous ~ | |
| Type | Geological unit |
| Sub-units | Rabekke, Robbedale & Jydegaard Formations |
| Underlies | Arnager Greensand Formation |
| Overlies | Bagå Formation |
| Lithology | |
| Primary | Claystone, sandstone |
| Location | |
| Region | Bornholm |
| Country | Denmark |
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]
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.[2]
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]