La Colonia Formation

La Colonia Formation
Stratigraphic range: Campanian-Maastrichtian ~73–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
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 / -43.0; -67.5
Approximate paleocoordinates	45°42′S 53°48′W / 45.7°S 53.8°W / -45.7; -53.8
Region	Chubut Province
Country	Argentina
Extent	Cañadón Asfalto Basin
Type section
Named for	Sierra La Colonia
La Colonia Formation (Argentina)

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]