La Colonia Formation | |
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Stratigraphic range: Campanian-Maastrichtian ~ | |
![]() An outcrop of the La Colonia Formation on the Somún Curá plateau that is the type locality of Chubutinectes. Photographed in 2009. | |
Type | Geological formation |
Sub-units | Lower, Middle and Upper members |
Underlies | El Buitre & Sarmiento Formations |
Overlies | Cerro Barcino & Paso del Sapo Formations |
Thickness | Up to 210–240 m (690–790 ft) Thinning to 17 m (56 ft) around Telsen |
Lithology | |
Primary | Siltstone |
Other | Sandstone, claystone, conglomerate |
Location | |
Coordinates | 43°00′S 67°30′W / 43.0°S 67.5°W |
Approximate paleocoordinates | 45°42′S 53°48′W / 45.7°S 53.8°W |
Region | Chubut Province |
Country | Argentina |
Extent | Cañadón Asfalto Basin |
Type section | |
Named for | Sierra La Colonia |
The La Colonia Formation is a geological formation in Argentina whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.[1]
Originally thought to be Campanian (c.73-72 million years ago) in age or earlier, studies of underlying formations have made a Maastrichtian (72–66 million years ago) age more likely.[2]
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