Lunde Formation

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Coordinates: 61°30′N 2°12′E / 61.5°N 2.2°E / 61.5; 2.2
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Lunde Formation
Ma
↓
Approximate paleocoordinates
46°12′N 1°18′W / 46.2°N 1.3°W / 46.2; -1.3
RegionSnorre Field, North Sea
Country Norway
 Scotland
ExtentNorthern Viking Graben
Type section
Named forLunde
Lunde Formation is located in North Sea
Lunde Formation

The Lunde Formation is a

period.[1] The formation comprises dry floodplain; paleosol/pedogenic, concretionary, brown, red, calcareous mudstones.[2]

Description

The Lunde Formation occurs in the northern part of a

Late Permian to Early Triassic rifting.[1]

With an approximate width of 400 kilometres (250 mi) between present mainland Norway and the

transgression from the north and south in late Sinemurian to early Pliensbachian times.[1]

The climate during deposition of the Lunde Formation was semiarid and highly seasonal, typical for the contemporary palaeogeographic position at 40-50 degrees North paleolatitude.[1]

The basin was linked to a marine borealic seaway, probably located some tens to hundreds of kilometers to the north and to provenance areas composed of Archean gneisses, Caledonian metamorphic rocks and Devonian sandstones. These sources located on the Shetland Platform and in the southwestern area of Norway and deposited into a vast alluvial plain in the Triassic of what is now the North Sea.[1]

The bone slice of Plateosaurus was discovered during the description of a core retrieved in February 1997 from well 34/4-9S in the north-western part of the Snorre Field. It occurs in a reddish-brown, mudstone interval referred to as the upper member of the Lunde Formation.[3]

The mudstone is composed of dominantly compound and cumulative

slickensides, mottling, root traces and mud cracks. The paleosol type is similar to modern vertisols forming in semi-arid areas with seasonal precipitation, commonly with dry periods lasting 4-8 months. The presence of root traces suggests that the floodplain was covered with small trees and bushes, vegetation suitable for herbivorous animals living on the alluvial plain.[3]

Beds containing the bone specimen belong to the younger of two palynomorph assemblages containing the spore Kreuselisporites reissingeri thought to indicate an early Rhaetian rather than a Norian age, corresponding approximately to an age of 203-202 Ma according to the time scale of Gradstein et al. (2005).[3]

See also

References

  1. ^ a b c d e Hurum et al., 2006, p.117
  2. ^ Snorre Field well 34/4-9S at Fossilworks.org
  3. ^ a b c Hurum et al., 2006, p.118

Bibliography

  • Hurum, J.H.; M. Bergan; R. Müller; J.P. Nystuen, and N. Klein. 2006. A Late Triassic dinosaur bone, offshore Norway. Norwegian Journal of Geology 86. 117-123. Accessed 2019-10-12.
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