Castrillo de la Reina Formation
| Castrillo de la Reina Formation | |
|---|---|
| Stratigraphic range: late Barremian-early Aptian ~ | |
| Type | Geological formation |
| Unit of | Oliván Group |
| Underlies | Utrillas & Escucha Formations |
| Overlies | Hortigüela & Leza Formations |
| Lithology | |
| Primary | Claystone |
| Other | Sandstone |
| Location | |
| Coordinates | 42°00′N 3°18′W / 42.0°N 3.3°W |
| Approximate paleocoordinates | 32°36′N 8°12′E / 32.6°N 8.2°E |
| Region | Castile and León |
| Country | Spain |
| Extent | Cameros Basin |
The Castrillo de la Reina Formation is a geological formation in Spain. It is late Barremian to early Aptian in age. It interpreted as a fluvial deposit. It primarily consists of red clay, with ribbon shaped sandstone channel fills. The rebbachisaurid dinosaur Demandasaurus occurs in the formation, alongside somphospondylan Europatitan as well as indeterminate small ornithopods, iguanodonts (including members of the Hadrosauriformes) and spinosaurids, an early rhabdodontoid (indeterminate) and the lizard Arcanosaurus.