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†Utahraptor ostrommaysi Kirkland et al. , 1993 Utahraptor (meaning " Utah 's predator") is a genus of large dromaeosaurid (a group of feathered carnivorous theropods ) dinosaur that lived during the Early Cretaceous period from around 135 to 130 million years ago in what is now the United States .
Baena † Baibisha – or unidentified comparable form † Bajarunia † Bajarunia confusionensis – type locality for species † Bakevellia † Bakevellia costata † Bakevellia costatus – or unidentified comparable form † Bakevellia exporrecta † Bakevellia silberlingi – type locality for species Life reconstruction of an individual rearing up to defend itself against a pair of ...
Diagram illustrating the Early Cretaceous dromaeosaurid ("raptor") Utahraptor with an anachronistic human to scale †Utahraptor – type locality for genus †Utahraptor ostrommaysi – type locality for species †Uteodon †Uteodon aphanoecetes; Valvata †Vancleavea †Vancleavea campi †Venenosaurus – type locality for genus
The park is located east of U.S. Route 191 and west of Arches National Park, and covers 6,500 acres (26 km 2).The park contains the Dalton Wells Quarry, which have yielded remains of dinosaurs that have advanced understanding of paleontology, such as those of the giant dromaeosaur dinosaur Utahraptor ostrommaysi. [2]
Illustration of a Utahraptor with a human to scale. 1990. Ostrom published further arguments building a case for a close evolutionary relationship between dromaeosaurids and birds. [5] 1993. Kirkland, Burge, and Gaston described the new genus and species Utahraptor ostrommaysi. [6]
The original definition of Eudromaeosauria was a node-based definition. It was defined as the least-inclusive clade containing Utahraptor ostrommaysi, Velociraptor mongoliensis, Deinonychus antirrhopus, and Saurornitholestes langstoni. The apomorphic features of the group were left unresolved at the time of its naming. [6]
The Cedar Mountain Formation is the name given to a distinctive sedimentary geologic formation in eastern Utah, spanning most of the early and mid-Cretaceous.The formation was named for Cedar Mountain in northern Emery County, Utah, where William Lee Stokes first studied the exposures in 1944.
[1] [2] The type specimen was found alongside 4 partial skeletons of Gastonia that were placed as paratypes, along with the type specimen of Utahraptor and an iguanodontid. [1] [2] Gastonia is among the most common dinosaur fossils in the Cedar Mountain Formation, with many individuals being found across several quarries in the southwest.