Earth:Braksøya Formation
From HandWiki
Short description: Norwegian geological formation
| Braksøya Formation Stratigraphic range: Sheinwoodian ~428–426 Ma | |
|---|---|
| Type | Formation |
| Overlies | Ringerike & Modum: Bruflat Formation Skien & Holmestrand: Porsgrunn & Skinnerbukta Formations |
| Lithology | |
| Primary | Limestone |
| Location | |
| Coordinates | [ ⚑ ] : 60°00′N 10°12′E / 60.0°N 10.2°E |
| Paleocoordinates | [ ⚑ ] 21°06′S 8°06′W / 21.1°S 8.1°W |
| Region | Buskerud |
| Country |  Norway |
| Extent | Shallow Caledonian foreland basin |
| Type section | |
| Named for | Braksøya naturreservat (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 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]
Fossil content
The stromatoporoid bioherms of the Braksøya Formation have provided fossils of:[3][4]
- Stromatoporida
- Syringostromellidae
- Syringostromella cf. aspectabilis
- Syringostromellidae
- Actinostromatida
- Actinostromatidae
- Plectostroma norvegicum
- Actinostromatidae
- Clathrodictyida
- Clathrodictyidae
- Clathrodictyon cf. crickmayi
- Clathrodictyidae
See also
- List of fossiliferous stratigraphic units in Norway
- Buildwas Formation, Sheinwoodian type formation in England
- Llallagua Formation, Sheinwoodian fossiliferous formation in Bolivia
References
- ↑ Worsley et al., 2011, p.102
- ↑ Worsley et al., 2011, p.117
- ↑ 3.0 3.1 Braksøya Formation at Fossilworks.org
- ↑ Nestor, 1999
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. 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.
 |  |
