Dinosaur fossils found from the Guimarota Formation include tyrannosauroids such as Aviatyrannis and Stokesosaurus, the ornithopod Phyllodon, and the small coelurosaur Compsognathus.
Orodromeus (meaning "Mountain Runner") is a genus of herbivorous ornithopod dinosaur from the Late Cretaceous of North America.
While birds are the best-known animals with this fused bone, they were not the only group and not even the first to have it: in a remarkable case of parallel evolution, a tarsometatarsus was also present in the Heterodontosauridae, a group of tiny ornithopod dinosaurs quite unrelated to birds.