Sobral Formation
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Unit ofMarambio Group
UnderliesCross Valley & La Meseta Formations
OverliesLópez de Bertodano Formation
| Sobral Formation | |
|---|---|
| Stratigraphic range: Danian ~ | |
| Type | Geological formation |
| Unit of | Marambio Group |
| Underlies | Cross Valley & La Meseta Formations |
| Overlies | López 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 |
| Approximate paleocoordinates | 63°12′S 66°36′W / 63.2°S 66.6°W |
| 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.
