Nyker Group

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]

Nyker Group
Stratigraphic range: Latest Jurassic to Early Cretaceous, 146–140 Ma
TypeGeological unit
Sub-unitsRabekke Formation, Robbedale Formation, Jydegaard Formation
UnderliesArnager Greensand Formation
OverliesBagå Formation
Lithology
PrimaryClaystone and Sandstone
Location
RegionBornholm
Country Denmark

Rabekke Formation
Main article: 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.[2]

Robbedale Formation
Main article: 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]

Jydegaard Formation
Main article: 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]

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See also

References
  1. Bonde, N.; Christiansen, P. (2003). "New dinosaurs from Denmark". Comptes Rendus Palevol. 2: 13. doi:10.1016/S1631-0683(03)00009-5.
  2. Milàn, J.; Rasmussen, B.W.; Bonde, N. (2012) "Coprolites with prey remains from coprophagous organisms from the Lower Cretaceous (Late Berriasian) Jydegaard Formation of Bornholm, Denmark". New Mexico Museum of Natural History and Science. Bulletin 57: 235-240
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