La Huérguina Formation
| La Huérguina Formation | |
|---|---|
| Stratigraphic range: Barremian ~ | |
Lithographic limestones of the Las Hoyas locality | |
| Type | Geological formation |
| Underlies | Contreras Formation or Unconformity with the Utrillas Group |
| Overlies | Tragacete Formation |
| Thickness | 60–100 m (200–330 ft) |
| Lithology | |
| Primary | Limestone, marl |
| Other | Conglomerate |
| Location | |
| Coordinates | 40°05′23″N 1°53′52″W / 40.0897°N 1.8978°W |
| Region | Cuenca, Castile-La Mancha |
| Country | Spain |
| Extent | South Iberian Basin |
| Type section | |
| Named for | Huérguina |
The La Huérguina Formation (also known as the Calizas de La Huérguina Formation, La Huérguina Limestone Formation or as the Una Formation) is a geological formation in Spain whose strata date back to the Barremian stage of the Early Cretaceous. Las Hoyas is a Konservat-Lagerstätte within the formation, located near the city of Cuenca, Spain. The site is mostly known for its exquisitely preserved dinosaurs, especially enantiornithines. The lithology of the formation mostly consists of lacustrine limestone deposited in a freshwater wetland environment.