Braksøya Formation

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The Braksøya Formation is a geologic formation in the Ringerike and Modum areas in Buskerud, Norway, where it overlies the Bruflat Formation and the Skien and Holmestrand areas where it overlies the Porsgrunn Formation and Skinnerbukta Formation respectively.[1] The formation, deposited in a shallow Caledonian foreland basin at the edge of a closing Iapetus Ocean,[2] preserves fossils dating back to the Sheinwoodian stage of the Silurian period.[3]

Braksøya Formation
Stratigraphic range: Sheinwoodian
~428–426 Ma
TypeFormation
OverliesRingerike & Modum: Bruflat Formation
Skien & Holmestrand: Porsgrunn & Skinnerbukta Formations
Lithology
PrimaryLimestone
Location
Coordinates60°00′N 10°12′E / 60.0°N 10.2°E / 60.0; 10.2
Approximate paleocoordinates21°06′S 8°06′W / 21.1°S 8.1°W / -21.1; -8.1
RegionBuskerud
Country Norway
ExtentShallow Caledonian foreland basin
Type section
Named forBraksøya naturreservat [no]
Braksøya Formation is located in Norway
Braksøya Formation
Braksøya Formation (Norway)

Fossil content

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Paleogeography of the Early Silurian with the closing Iapetus Ocean due to the Caledonian orogeny between Greenland and Norway

The stromatoporoid bioherms of the Braksøya Formation have provided fossils of:[3][4]

See also

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References

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  1. ^ Worsley et al., 2011, p.102
  2. ^ Worsley et al., 2011, p.117
  3. ^ a b Braksøya Formation at Fossilworks.org
  4. ^ Nestor, 1999

Bibliography

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  • Worsley, D.; Baarli, B. G.; Howe, M. P. A.; Hjaltason, F.; Alm, D. (2011), "New data on the Bruflat Formation and the Llandovery/Wenlock transition in the Oslo Region, Norway", Norsk Geologisk Tidsskrift, 91: 101–120
  • Nestor, H (1999), "Community structure and succession of Baltoscandian Early Palaeozoic stromatoporoids", Proceedings of the Estonian Academy of Sciences, 48: 123–139