Earth:Jydegaard Formation

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Jydegaard Formation
Stratigraphic range: Late Berriasian-early Valanginian
~145–139 Ma
TypeGeological formation
Unit ofNyker Group
Sub-unitsRødbjerg & Tornhøj Members
UnderliesArnager Greensand Formation
OverliesRobbedale Formation
Lithology
PrimaryClaystone, sandstone
Location
Coordinates [ ⚑ ] : 55°06′N 14°48′E / 55.1°N 14.8°E / 55.1; 14.8
Paleocoordinates [ ⚑ ] 47°12′N 21°24′E / 47.2°N 21.4°E / 47.2; 21.4
RegionBornholm
Country Denmark
Jydegaard Formation is located in Denmark
Jydegaard Formation
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 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]

See also

  • List of fossiliferous stratigraphic units in Denmark

References

  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24 1.25 1.26 1.27 Bonde, Niels; Christiansen, Per (2003). "New dinosaurs from Denmark". Comptes Rendus Palevol 2: 13–26. doi:10.1016/S1631-0683(03)00009-5. 
  2. 2.0 2.1 2.2 2.3 Milàn, J.; Rasmussen, B. W.; Bonde, N. (2012). "Coprolites with prey remains from the Lower Cretaceous (Late Berriasian) Jydegaard Formation of Bornholm, Denmark". New Mexico Museum of Natural History and Science. Bulletin 57: 235–240. http://publicationlist.org/data/jesper.milan/ref-129/2012%20-%20Milàn%20et%20al%202012%20-%20Coprolites%20from%20Bornholm.pdf. 
  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. Bibcode2009CrRes..30.1345S. 
  4. "Parvodus rugianus". Paleobiology Database. http://paleodb.org/?a=basicTaxonInfo&taxon_no=251914. 
  5. "Pleuropholis serrata". Paleobiology Database. http://paleodb.org/?a=basicTaxonInfo&taxon_no=99838. 

Further reading

  • J. Rees. 2000. An Early Cretaceous scincomorph lizard dentary from Bornholm, Denmark. Bulletin of the Geological Society of Denmark 48:105-109