Jydegaard Formation

Jydegaard Formation
Stratigraphic range: Early Cretaceous, Late Berriasian- Early Valanginian
↓
Type Geological Formation
Unit of Nyker Group
Sub-units Rødbjerg Member, Tornhøj Member
Underlies Arnager Greensand Formation
Overlies Robbedale Formation
Lithology
Primary Claystone and Sandstone
Location
Region Bornholm
Country  Denmark

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]

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

Footnotes

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Bonde, N.; Cristiansen, P. (2003). "New dinosaurs from Denmark". Comptes Rendus Palevol. 2 (13). doi:10.1016/51631-0683(03)00009-5.
  2. 1 2 3 4 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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