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Sobral Formation
Paleontological Formation in Antarctica / From Wikipedia, the free encyclopedia
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]
Quick Facts Type, Unit of ...
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 | 64.3°S 56.7°W / -64.3; -56.7 |
Approximate paleocoordinates | 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 |
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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.