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Hell Creek
This is the largest Ammonite cast available on the web
Teeth seem to come from the raised parts pointing into the center spaces
The life span for these three lakes was: over 17 million years for Lake Uinta
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