[F] Arén Formation - Spain
Stratigraphic correlation finds that the Arén Formation is likely Maastrichtian, spanning the upper most levels of the Campanian and the entire Maastrichtian. The overlying Tremp Formation is apparently Danian (Paleocene), and includes a variety of dinosaur fossils, mostly limited to teeth (which are distinctly dinosaurian including ambiguous dromaeosaurid and theropod teeth, and sauropod and hadrosaur teeth). Eggshells are also known.
Further stratigraphic and geologic study shows that the Arén is composed of silt and sandstones, with basic limestone levels, indicating a deltaic environment for the most part; the Tremp Formation is comprised of more fluvial sandstones and alternating distinctive redbeds.
Blasisaurus canudoi - Hadrosauridae Lambeosaurinae - Cretaceous Late Maastrichtian