Utahraptor ostrommaysorum. Arizona Natural History Museum
Utahraptor ostrommaysorum. The first specimens of Utahraptor were found in 1975 by Jim Jensen in the Dalton Wells Quarry in east-central Utah, near the town of Moab. Utahraptor (meaning "Utah's predator") is a genus of theropod dinosaurs, including the largest known members of the family Dromaeosauridae. Fossil specimens date to the upper Barremian stage of the late Cretaceous period (in rock strata dated to 126 ± 2.5 million years ago). The largest specimens are estimated to have reached up to 23 ft long and somewhat less than 1,100 lb in weight, comparable to a grizzly bear in size.
Utahraptor_ANHM130901 © Don Tibbits
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