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21 Aug, 2019
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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.

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
Dromaeosauroides	D. bornholmensis	Robbedale	Two teeth and possible coprolites.		Holotype tooth Life Reconstruction

Crocodylomorphs

Genus	Species	Location	Material	Description	Images
Pholidosaurus	unknown	Robbedale	A tooth tentatively referred to Pholidosaurus		Possible tooth

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
Lepidotes	L. sp	Robbedale	Teeth, jaws and scales
Hybodus	unknown	Robbedale	Teeth and scales
Parvodus	P. rugianus	Robbedale	Teeth, finspines and head "hooks"
Pleuropholis	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
Neomiodon	unknown	Robbedale	many specimens	Neomiodon specimens are thought to be victim to a mass mortality such as poisoning.
Viviparus	unknown	Robbedale	many specimens	Viviparus specimens are thought to be victim to a mass mortality such as poisoning.

Color key

Taxon	Reclassified taxon	Taxon falsely reported as present	Dubious taxon or junior synonym	Ichnotaxon	Ootaxon	Morphotaxon

Notes
Uncertain or tentative taxa are in small text; ~~crossed out~~ taxa are discredited.

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.