Sobral Formation

Sobral Formation Stratigraphic range: Danian 66 to 61.6 Ma
Type	Geological formation
Unit of	Marambio Group
Underlies	Cross Valley Formation
Overlies	Lopez de Bertodano Formation
Lithology
Primary	siltstone, mudstone
Other	concretion, sandstone
Location
Region	Seymour Island, James Ross Island group
Country	Antarctica

The Sobral Formation is a palaeontological formation located in Antarctica. It dates to the Danian stage of the Lower Paleocene period.

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. One of the most significant sites is on Seymour Island.