The Arén Formation is a geological formation in Arén, Spain whose strata date back to the Late Cretaceous

Late Cretaceous

The Late Cretaceous is the younger of two epochs into which the Cretaceous period is divided in the geologic timescale. Rock strata from this epoch form the Upper Cretaceous series...

. Dinosaur remains are among the fossils that have been recovered from the formation.

Dinosaurs

Dinosaur eggs, sauropod tracks, indeterminate sauropod remains, theropod tracks, euornithopod tracks, and indeterminate iguanodont remains present in Provincia de Lleida

Dinosaur Dinosaur Dinosaurs are a diverse group of animals of the clade and superorder Dinosauria. They were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period until the end of the Cretaceous , when the Cretaceous–Paleogene extinction event led to the extinction of... s of the Arén Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Ricardoestesia Ricardoestesia Richardoestesia is a medium-sized genus of theropod dinosaur from the late Cretaceous Period of what is now North America. It is known from a single pair of lower jaw bones and a large number of isolated teeth....	Indeterminate	Provincia de Lleida
Hypselosaurus Hypselosaurus Hypselosaurus was a long titanosaurid sauropod that lived in Europe during the Late Cretaceous Period .Hypselosaurus was scientifically described by geologist Pierre Émile Philippe Matheron in 1846 and formally named in...	Indeterminate	Provincia de Lleida			Later found to be indeterminate sauropod remains.
Megalosaurus Megalosaurus Megalosaurus is a genus of large meat-eating theropod dinosaurs of the Middle Jurassic period of Europe...	Indeterminate	Niederosterreich, Austria.			Later found to be indeterminate theropod remains.
Orthomerus Orthomerus Orthomerus is a genus of duckbill dinosaur from the Late Cretaceous of The Netherlands, Belgium and possibly Ukraine. It is today an obscure genus, but in the past was conflated with the much better known Telmatosaurus....	Indeterminate	Provincia de Lleida
Pararhabdodon Pararhabdodon Pararhabdodon was a genus of derived hadrosauroid or basal hadrosaurid dinosaur, from the Maastrichtian-age Upper Cretaceous Tremp Formation of Spain...	P. isonensis	Provincia de Lleida
Rhabdodon Rhabdodon Rhabdodon is a genus of dinosaur that lived in Europe approximately 70 million years ago in the Late Cretaceous. It is unclear whether it was an iguanodont or a hypsilophodont, and may be a "missing link" between the two. Current evidence indicates it is an iguanodont similar to Tenontosaurus...	R. priscus	Provincia de Lleida
Titanosaurus Titanosaurus Titanosaurus is a genus of sauropod dinosaur, first described by Lydekker in 1877. It is known from the Maastrichtian Lameta Formation of India...	T. indicus	Provincia de Lleida			Later found to be indeterminate sauropod remains.