Jydegaard Formation
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.[1]
| Jydegaard Formation | |
|---|---|
| Stratigraphic range: Late Berriasian-early Valanginian ~ | |
| 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 |
| Approximate paleocoordinates | 47°12′N 21°24′E / 47.2°N 21.4°E |
| Region | Bornholm |
| Country | Denmark |
Jydegaard Formation (Denmark) | |
Fossil content edit
Thin bone fragments have been uncovered that may belong to pterosaurs or birds.[1]
Dinosaurs edit
A tooth possibly belonging to a juvenile titanosaur has been found in the formation.[1]
| Genus | Species | Location | Material | Description | Images |
|---|---|---|---|---|---|
| D. bornholmensis[1] | Two teeth and possible coprolites.[2] | |
Crocodylomorphs edit
| Genus | Species | Location | Material | Description | Images |
|---|---|---|---|---|---|
| unknown | Robbedale[1] | A tooth tentatively referred to Pholidosaurus[3] | |
Fish edit
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.[1]
| Genus | Species | Location | Material | Description | Images |
|---|---|---|---|---|---|
| L. sp[1] | Robbedale[1] | Teeth, jaws and scales[1] | |||
| unknown | Robbedale[2] | Teeth and scales[2] | |||
| Parvodus[1] | P. rugianus[4] | Robbedale[1] | Teeth, finspines and head "hooks"[1] | ||
| P. serrata[5] | Robbedale[1] | unknown |
Turtles edit
Unidentified turtle carapaces have been uncovered in the Formation.[1]
Lizards edit
A lower jaw from a lizard has been recovered from the formation.[1]
Bivalves edit
| Genus | Species | Location | Material | Description | Images |
|---|---|---|---|---|---|
| Neomiodon[1] | unknown | Robbedale[1] | many specimens[1] | Neomiodon specimens are thought to be victim to a mass mortality such as poisoning.[1] | |
| unknown | Robbedale[1] | many specimens[1] | Viviparus specimens are thought to be victim to a mass mortality such as poisoning.[1] |
Color key
| Notes Uncertain or tentative taxa are in small text; |
See also edit
References edit
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab Bonde, Niels; Christiansen, Per (2003). "New dinosaurs from Denmark". Comptes Rendus Palevol. 2: 13–26. doi:10.1016/S1631-0683(03)00009-5.
- ^ a b c d 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.
- ^ 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 edit
- J. Rees. 2000. An Early Cretaceous scincomorph lizard dentary from Bornholm, Denmark. Bulletin of the Geological Society of Denmark 48:105-109