This list of the Mesozoic life of Utah contains the various prehistoric life-forms whose
fossilized remains have been reported from
within the US state of
Utah and are between 252.17 and 66 million years of age.
Diagram illustrating the sizes of three specimens of the Late Cretaceous long-necked dinosaur Alamosaurus, with an anachronistic human to scale †Alamosaurus
Illustration of a reconstructed skull and restorative portrait of the Late Cretaceous primitive duck-billed dinosaur Eolambia †Eolambia – type locality for genus
Diagram illustrating the Early Cretaceous dromaeosaurid ("raptor") Utahraptor with an anachronistic human to scale †Utahraptor – type locality for genus