Portezuelo Formation
| Portezuelo Formation | |
|---|---|
| Stratigraphic range: late Turonian–early Coniacian ~ | |
| Type | Geological formation |
| Unit of | Neuquén Group Río Neuquén Subgroup |
| Underlies | Los Bastos Formation |
| Overlies | Lisandro Formation |
| Thickness | 95–130 m (312–427 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Conglomerate, limestone |
| Location | |
| Coordinates | 38°30′S 68°42′W / 38.5°S 68.7°W |
| Approximate paleocoordinates | 44°24′S 47°12′W / 44.4°S 47.2°W |
| Region | Mendoza, Río Negro & Neuquén Provinces |
| Country | Argentina |
| Extent | Neuquén Basin |
| Type section | |
| Named for | Sierra del Portezuelo |
The Portezuelo Formation is a geologic formation of Late Cretaceous (Late Turonian to Early Coniacian) age, outcropping in the Mendoza, Río Negro and Neuquén provinces of Argentina. It is the fourth-oldest formation in the Neuquén Group and the older of the two formations in the Río Neuquén Subgroup. Formerly, that subgroup was treated as a formation, and the Portezuelo Formation was known as the Portezuelo Member.