Arén Formation
| Arén Formation | |
|---|---|
| Stratigraphic range: Campanian-Maastrichtian ~ | |
| Type | Geological formation |
| Unit of | Tremp-Graus Basin |
| Underlies | Tremp Group |
| Lithology | |
| Primary | Sandstone |
| Other | Limestone |
| Location | |
| Coordinates | 42°18′N 1°36′E / 42.3°N 1.6°E |
| Approximate paleocoordinates | 34°00′N 1°36′E / 34.0°N 1.6°E |
| Region | Lérida |
| Country | Spain |
| Type section | |
| Named for | Arén |
The Arén Formation or Arén Sandstone (Catalan: Calcàries i gresos d’Areny) is a geological formation in the Tremp-Graus Basin around Arén, Catalonia, Spain whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation. The formation dates to the Campanian to Maastrichtian and underlies the Tremp Group.