Braksøya Formation

Braksøya Formation Stratigraphic range: Sheinwoodian ~428–426 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Formation
Overlies	Ringerike & Modum: Bruflat Formation Skien & Holmestrand: &
Lithology
Primary	Limestone
Location
Coordinates	60°00′N 10°12′E / 60.0°N 10.2°E / 60.0; 10.2Coordinates: 60°00′N 10°12′E / 60.0°N 10.2°E / 60.0; 10.2
Approximate paleocoordinates	21°06′S 8°06′W / 21.1°S 8.1°W / -21.1; -8.1
Region	Buskerud
Country	Norway
Extent	Shallow Caledonian foreland basin
Type section
Named for	[no]
Braksøya Formation (Norway)

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 and 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]

Fossil content[]

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[]

• List of fossiliferous stratigraphic units in Norway
• Buildwas Formation, Sheinwoodian type formation in England
• Llallagua Formation, Sheinwoodian fossiliferous formation in Bolivia

References[]

Bibliography[]

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