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Hell Creek
Teeth seem to come from the raised parts pointing into the center spaces
Among the contemporaries of Pachycephalosaurus were Albertosaurus and Troodon
4 m (8 feet) in length
" The fossil record includes about 2100 species of crinoids and 800 species survive today
Thrinaxodon, cynodont, sculpture Oviraptor Hell CreekThrinaxodon (pronounced thrin AX ah DON) was a cat sized cynodont, an ancestor of the mammals, but not a mammal itself. Thrinaxodon was not a dinosaur. This therapsid lived during the late Triassic period, roughly 240 million years ago. Small holes in the snout bones suggest that it may have had whiskers, a mammalian characteristic. Its teeth were also similar to those of mammals. The skull was about 1. 5 inches long. Fossils have been found in South
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