Carnotaurus Skull cast 1:4 Scale. Late Cretaceous. 72 and 69.9 MYA. Theropod. Carnivore. The only known skeleton discovery was from Chubut Province, Argentina in 1984. It was estimated to be about 26.2 ft. and weighed about 1.4 tons. Carnotaurus was a highly specialized dinosaur with small arms (even smaller than Tyrannosaurus) and unique skull. Skull Length: 23 cm.