| Jydegaard Formation | |
|---|---|
| Stratigraphic range: Late Berriasian-early Valanginian ~145–139 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
| Type | Geological formation |
| Unit of | Nyker Group |
| Sub-units | Rødbjerg & Tornhøj Members |
| Underlies | Arnager Greensand Formation |
| Overlies | Robbedale Formation |
| Lithology | |
| Primary | Claystone, sandstone |
| Location | |
| Coordinates | 55°06′N 14°48′E / 55.1°N 14.8°E / 55.1; 14.8 |
| Approximate paleocoordinates | 47°12′N 21°24′E / 47.2°N 21.4°E / 47.2; 21.4 |
| Region | Bornholm |
| Country |  Denmark |
  Jydegaard Formation (Denmark) | |
The Jydegaard Formation (also spelled as 'Jydegård') is a geological formation dating to the Early Cretaceous, about 145–139 million years ago. It is on the island of Bornholm, Denmark. Vertebrate fossils have been found in the formation.
Fossil content
Thin bone fragments have been uncovered that may belong to pterosaurs or birds.
Dinosaurs
A tooth possibly belonging to a juvenile titanosaur has been found in the formation.
| Genus | Species | Location | Material | Description | Images |
|---|---|---|---|---|---|
|
D. bornholmensis |
Two teeth and possible coprolites. |
  |
Crocodylomorphs
| Genus | Species | Location | Material | Description | Images |
|---|---|---|---|---|---|
|
unknown |
Robbedale |
A tooth tentatively referred to Pholidosaurus |
 |
Fish
Fish remains have been found in coprolites possibly belonging to the dromaeosaur Dromaeosauroides or marine turtles. Also, unidentified pycnodont jaws and two small stem-teleosteans have been uncovered. Amioid scales have also been revealed.
| Genus | Species | Location | Material | Description | Images |
|---|---|---|---|---|---|
|
L. sp |
Robbedale |
Teeth, jaws and scales |
|||
|
unknown |
Robbedale |
Teeth and scales |
|||
|
P. rugianus |
Robbedale |
Teeth, finspines and head "hooks" |
|||
|
P. serrata |
Robbedale |
unknown |
Turtles
Unidentified turtle carapaces have been uncovered in the Formation.
Lizards
A lower jaw from a lizard has been recovered from the formation.
Bivalves
| Genus | Species | Location | Material | Description | Images |
|---|---|---|---|---|---|
|
unknown |
Robbedale |
many specimens |
Neomiodon specimens are thought to be victim to a mass mortality such as poisoning. |
||
|
unknown |
Robbedale |
many specimens |
Viviparus specimens are thought to be victim to a mass mortality such as poisoning. |
Color key
|
Notes Uncertain or tentative taxa are in small text; |
See also
References
- ^ Bonde, Niels; Christiansen, Per (2003). "New dinosaurs from Denmark". Comptes Rendus Palevol. 2 (1): 13–26. Bibcode:2003CRPal...2...13B. doi:10.1016/S1631-0683(03)00009-5.
- ^ Milàn, J.; Rasmussen, B. W.; Bonde, N. (2012). "Coprolites with prey remains from the Lower Cretaceous (Late Berriasian) Jydegaard Formation of Bornholm, Denmark" (PDF). New Mexico Museum of Natural History and Science. Bulletin. 57: 235–240. Archived from the original (PDF) on 2016-03-04. Retrieved 2013-09-25.
- Schwarz-Wings, D.; Rees, J.; Lindgren, J. (2009). "Lower Cretaceous Mesoeucrocodylians from Scandinavia (Denmark and Sweden)". Cretaceous Research. 30 (5): 1345. Bibcode:2009CrRes..30.1345S. doi:10.1016/j.cretres.2009.07.011.
- "Parvodus rugianus". Paleobiology Database. Retrieved 25 September 2013.
- "Pleuropholis serrata". Paleobiology Database. Retrieved 25 September 2013.
Further reading
- J. Rees. 2000. An Early Cretaceous scincomorph lizard dentary from Bornholm, Denmark. Bulletin of the Geological Society of Denmark 48:105-109