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 ~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	55.1°N 14.8°E / 55.1; 14.8
Approximate paleocoordinates	47.2°N 21.4°E / 47.2; 21.4
Region	Bornholm
Country	Denmark
Jydegaard Formation (Denmark)

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	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

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.

See also

• List of fossiliferous stratigraphic units in Denmark