Sobral Formation

Sobral Formation
Stratigraphic range: Danian
~66–61.6 Ma
↓
Type Geological formation
Unit of Marambio Group
Underlies Cross Valley Formation
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 / -64.3; -56.7Coordinates: 64°18′S 56°42′W / 64.3°S 56.7°W / -64.3; -56.7
Approximate paleocoordinates 63°12′S 66°36′W / 63.2°S 66.6°W / -63.2; -66.6
Region Seymour Island, James Ross Island group
Country Antarctica

Map of James Ross Island group
Seymour Island is number 8
For the part of the Portuguese Lourinhã Formation, see Sobral Unit.

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

References

  1. ↑ 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. doi:10.1016/j.gr.2015.10.018.
  2. ↑ 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. doi:10.1371/journal.pone.0114743.

Further reading

  • M. A. Baldoni and V. D. Barreda. 1986. Estudio palinológico de las formaciones López de Bertodano y Sobral, Isla Vicecomodoro Marambio, Antártida. Boletín del IG-USP, Serie Científica (17)89-98
  • H. F. Filkorn. 1994. Fossil scleractinian corals from James Ross Basin, Antarctica. Antarctic Research Series 65:1-96
  • I. Poole, A. M. W. Mennega, and D. J. Cantrill. 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 124:9-27
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