Jydegaard Formation

Jydegaard Formation
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
Approximate paleocoordinates	47°12′N 21°24′E / 47.2°N 21.4°E
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.^[1]

Fossil content

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]

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

Crocodylomorphs

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]

Genus	Species	Location	Material
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

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]

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

^ ^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 (1): 13–26. Bibcode:2003CRPal...2...13B. 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. 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.