Sobral Formation

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]

Sobral Formation
Stratigraphic range: Danian ~66–61.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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

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

• Geology portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Antarctica
• List of fossil sites