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Utahraptor was one of, if not the largest and heaviest of all dromaeosaurids, with the largest assigned specimen BYUVP 15465 having a femoral length of 56.5–60 cm (22.2–23.6 in). [8] [9] Utahraptor is estimated to have reached 6–7 metres (20–23 ft) in length and somewhat less than 500 kg (1,100 lb), comparable in weight to a polar bear.
The 20-foot-long (6.1 m) Utahraptor is commonly considered to be a close match to the film's dinosaurs, which are much larger than either Deinonychus or Velociraptor were in life. [ 82 ] [ 83 ] See also
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]
Dromaeosaurus (/ ˌ d r oʊ m i ə ˈ s ɔːr ə s,-m i. oʊ-/; [3] lit. ' running lizard ') is a genus of dromaeosaurid theropod dinosaur that lived during the Late Cretaceous period (middle late Campanian and Maastrichtian), sometime between 80 and 69 million years ago, in Alberta, Canada and the western United States.
Siats (/see-ats/) is an extinct genus of large theropod dinosaurs known from the Late Cretaceous Cedar Mountain Formation (Mussentuchit Member) of Utah, United States.The genus contains a single species, Siats meekerorum.
Sauropods were still present, but they were not as diverse as they were in the Jurassic Period. Theropods from the Early Cretaceous of North America include dromaeosaurids such as Deinonychus and Utahraptor, the carnosaur Acrocanthosaurus, and the coelurosaur Microvenator. Sauropods included Astrodon, Brontomerus, and Sauroposeidon.
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James Ian Kirkland (born August 24, 1954) is an American paleontologist and geologist.He has worked with dinosaur remains from the southwest United States of America and Mexico [1] [2] [3] and has been responsible for discovering new and important genera.