Photos • Location


Sobral_Formation Latitude and Longitude:
64°18′S 56°42′W / 64.3°S 56.7°W / -64.3; -56.7
From Wikipedia, the free encyclopedia
For the part of the Portuguese Lourinhã Formation, see Sobral Unit.
Sobral Formation
Stratigraphic range: Danian
~66–61.6  Ma
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Type Geological formation
Unit of Marambio Group
Underlies Cross Valley & La Meseta Formations
Overlies Lopez de Bertodano Formation
Thickness250 m (820 ft)
Lithology
Primary Siltstone, mudstone
OtherConcretion, sandstone
Location
Coordinates 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

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

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: 132–148. Bibcode: 2016GondR..38..132B. 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 (12): e114743. Bibcode: 2014PLoSO...9k4743C. doi: 10.1371/journal.pone.0114743. PMC  4262473. PMID  25493546.

Further reading

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