Allen Formation
| Allen Formation | |
|---|---|
| Stratigraphic range: Mid Campanian-Maastrichtian ~ | |
Outcrop of the Allen and Anacleto Formations at Auca Mahuida | |
| Type | Geological formation |
| Unit of | Malargüe Group |
| Underlies | Jagüel Formation |
| Overlies | Anacleto Formation |
| Thickness | up to 70 m (230 ft) |
| Lithology | |
| Primary | Mudstone, sandstone |
| Other | Limestone |
| Location | |
| Coordinates | 40°00′S 66°36′W / 40.0°S 66.6°W |
| Approximate paleocoordinates | 42°48′S 52°12′W / 42.8°S 52.2°W |
| Region | Neuquén, Río Negro & La Pampa Provinces |
| Country | Argentina |
| Extent | Neuquén Basin |
| Type section | |
| Named by | Uliana & Dellapé |
| Year defined | 1981 |
The Allen Formation is a geological formation in Argentina whose strata date back to the Late Cretaceous (middle Campanian to early Maastrichtian. Dinosaur remains are among the fossils that have been recovered from the formation. Indeterminate chelid remains and other vertebrates have also been discovered in this formation.