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It is from the early Cretaceous of about 125 million years ago
based on extrapolations from skull measurements
110-90 million years ago
Camarasaurus supremus (Lyle)
Acheroraptor temertyorum Compsognathus It is from the earlyAcheroraptor temertyorum Skull & Jaw Elements Acheroraptor is an extinct genus of dromaeosaurid theropod dinosaur known from the Hell Creek Formation of Montana. It contains a single species, Acheroraptor temertyorum. It is one of the two geologically youngest known species of dromaeosaurids, the other being Dakotaraptor, which is also known from Hell Creek. Acheroraptor was first described and named by David Evans, Derek Larson and Philip Currie in