Jydegaard Formation

The Jydegaard Formation (also spelled 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]

Jydegaard Formation
Stratigraphic range: Early Cretaceous, Late Berriasian- Early Valanginian
↓
TypeGeological Formation
Unit ofNyker Group
Sub-unitsRødbjerg Member, Tornhøj Member
UnderliesArnager Greensand Formation
OverliesRobbedale Formation
Lithology
PrimaryClaystone and Sandstone
Location
RegionBornholm
Country Denmark

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
Life Reconstruction

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

Footnotes
  1. Bonde, N.; Cristiansen, P. (2003). "New dinosaurs from Denmark". Comptes Rendus Palevol. 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.
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