Jydegaard Formation

Jydegaard Formation Stratigraphic range: Early Cretaceous, 145–140 Ma PreЄ Є O S D C P T J K Pg N ↓
Type	Geological Formation
Unit of	Nyker Group
Underlies	Arnager Greensand Formation
Overlies	Robbedale Formation
Lithology
Primary	Claystone and Sandstone
Location
Region	Bornholm
Country	Denmark

The Jydegaard Formation (also spelt as Jydegård) is a geological formation dating to the Early Cretaceous, about 145 to 140 million years ago. It is on the island of Bornholm, Denmark. Vertebrate fossils have been found in the formation.^[1]

Vertebrates

Thin bone fragments have been uncovered that may belong to pterosaurs or birds.^[1]

Dinosaurs

A tooth possibly belonging to a juvenile titanosaur has been found in the formation.^[1]

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.

Genus	Species	Location	Material	Description	Images
Dromaeosauroides[1]	D. bornholmensis[1]	Robbedale[1]	Two teeth and possible coprolites.[2]		Holotype tooth

Crocodilomorphs

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.

Genus	Species	Location	Material	Description	Images
Pholidosaurus[1]	unknown	Robbedale[1]	A tooth tentatively referred to Pholidosaurus[3]		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.^[1]

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.

Genus	Species	Location	Material	Description	Images
Lepidotes[1]	L. sp[1]	Robbedale[1]	Teeth, jaws and scales[1]
Hybodus[2]	unknown	Robbedale[2]	Teeth and scales[2]
Parvodus[1]	P. rugianus[4]	Robbedale[1]	Teeth, finspines and head "hooks"[1]
Pleuropholis[1]	P. serrata[5]	Robbedale[1]	unknown

Turtles

Unidentified turtle carapaces have been uncovered in the Formation.^[1]

Lizards

A lower jaw from a lizard has been recovered from the formation.^[1]

Bivalves

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.

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]
Viviparus[1]	unknown	Robbedale[1]	many specimens[1]	Viviparus specimens are thought to be victim to a mass mortality such as poisoning.[1]

See also

• List of fossiliferous stratigraphic units in Denmark

Footnotes

1. Bonde, N.; Cristiansen, P. (2003). "New dinosaurs from Denmark". Comptes Rendus Paleovol. 2 (13). doi:10.1016/51631-0683(03)00009-5.
2. 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.
3. Schwarz-Wings, D.; Rees, J.; Lindgren, J. (2009). "Lower Cretaceous Mesoeucrocodylians from Scandinavia (Denmark and Sweden)". Cretaceous Research 30 (5): 1345. doi:10.1016/j.cretres.2009.07.011.
4. "Parvodus rugianus". Paleobiology Database. Retrieved 25 September 2013.
5. "Pleuropholis serrata". Paleobiology Database. Retrieved 25 September 2013.