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about 75 million years ago
Later Cretaceous
30--Ectenaspis latucelsum--Ordovinian--UT
As teeth approach 6 inches they become rare
Age: Cretaceous
Utahraptor ostrommaysorum, Skull Oviraptor about 75 million years agoUtahraptor (meaning "Utah's predator" is a genus of theropod dinosaurs. It contains a single species, Utahraptor ostrommaysorum, which is the largest known member of the family Dromaeosauridae. Fossil specimens date to the upper Barremian stage of the early Cretaceous period (in rock strata dated to 126 2. 5 million years ago). The holotype specimen of Utahraptor is fragmentary, consisting of skull fragments, a tibia, claws and some caudal (tail)