Las Hoyas

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.As a Konservat-Lagerstätten, the preservation is exceptional. This may be a result of three factors: Microbial mats, Obruption and Stagnation.Las Hoyas was an inland lacustrine environment which presents an important aquatic and terrestrial flora (with many specimens of Charophytes, Montsechia, Weischelia or Frenelopsis) and diverse fauna, with specimens of at least five or six Phyla: Arthropods, Molluscs, Chordata and many vermiform soft bodied animals which might be Nemertines or Annelids.Las Hoyas Formation has been studied for more than two decades by researchers from the Universidad Autónoma de Madrid, the Universidad Complutense de Madrid and the National University of Distance Education, in collaboration with the Museo de las Ciencias de Castilla-La Mancha, which is responsible for the fossil record from the area.SpinolestesS. xenarthrosusExceptionally complete specimen, preserving soft tissues such as pelage, ears and internal organs.ConcavenatorC. corcovatus'Nearly complete and articulated skeleton.'ConcornisC. lacustris'Postcranial skeleton.'EoalulavisE. hoyasi'Thoracic region and forelimbs.'EuronychodonIndeterminateEuropejaraE. olcadesorumIberomesornisI. romerali'Postcranial skeleton.'MantellisaurusM. atherfieldensis PelecanimimusP. polyodon'Skull and partial skeleton.'ParonychodonIndeterminateRicardoestesiaIndeterminate