Earth:Sobral Formation
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Short description: Paleontological Formation in Antarctica
| Sobral Formation Stratigraphic range: Danian ~66–61.6 Ma | |
|---|---|
| Type | Geological formation |
| Unit of | Marambio Group |
| Underlies | Cross Valley & La Meseta Formations |
| Overlies | Lopez de Bertodano Formation |
| Thickness | 250 m (820 ft) |
| Lithology | |
| Primary | Siltstone, mudstone |
| Other | Concretion, sandstone |
| Location | |
| Coordinates | [ ⚑ ] : 64°18′S 56°42′W / 64.3°S 56.7°W |
| Paleocoordinates | [ ⚑ ] 63°12′S 66°36′W / 63.2°S 66.6°W |
| Region | Seymour Island, James Ross Island group |
| Country | Antarctica |
 Geologic map of Seymour Island, Antarctica with the Sobral Formation in brown | |
The Sobral Formation is a palaeontological formation located in Antarctica. It dates to the Danian stage of the Lower Paleocene period.[1]
Spectacular fossils documenting marine and terrestrial ecosystems soon after the (non-avian) dinosaurs became extinct at the Cretaceous-Paleogene boundary are found in this formation.[2] One of the most significant sites is on Seymour Island.
See also
- List of fossiliferous stratigraphic units in Antarctica
- List of fossil sites
References
- ↑ Bowman, V.; Ineson, J.; Riding, J.; Crame, J.; Francis, J.; Condon, D.; Whittle, R.; Ferraccioli, F. (2016). "The Paleocene of Antarctica: Dinoflagellate cyst biostratigraphy, chronostratigraphy and implications for the palaeo-Pacific margin of Gondwana". Gondwana Research 38: 132–148. doi:10.1016/j.gr.2015.10.018. Bibcode: 2016GondR..38..132B.
- ↑ Crame, J.A.; Beu, A.G.; Ineson J.R.; Francis J.A.; Whittle R.J.; Bowman V.C. (2014). "The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications". PLOS ONE 7 (12): e114743. doi:10.1371/journal.pone.0114743. PMID 25493546. Bibcode: 2014PLoSO...9k4743C.
Further reading
- Baldoni M. A., Barreda V. D. (1986). "Estudio palinológico de las formaciones López de Bertodano y Sobral, Isla Vicecomodoro Marambio, Antártida". Boletín del IG-USP, Serie Científica 17 (17): 89–98. doi:10.11606/issn.2316-8986.v17i0p89-96.
- Filkorn H. F. (1994). "Fossil scleractinian corals from James Ross Basin, Antarctica". Antarctic Research Series 65: 1–96.
- Poole I., Mennega A. M. W., Cantrill D. J. (2003). "Valdivian ecosystems in the Late Cretaceous and Early Tertiary of Antarctica: further evidence from myrtaceous and eucryphiaceous fossil wood". Review of Palaeobotany and Palynology 124 (1–2): 9–27. doi:10.1016/s0034-6667(02)00244-0. https://dspace.library.uu.nl/bitstream/1874/31608/1/Review%20of%20Palaeobotany%20and%20Palynology%20124%20%282003%29%201-2.pdf.
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