Authentic teeth and jaw of the mosasaur, prognathodon from the upper cretaceous phosphate deposits near khouribga, morocco. Mosasaurs are a family of enormous, marine reptiles that truly dominated the seas 90 million years ago. They ruled during the last 20-25 million years of the cretaceous period. As this is a one-of-a-kind natural specimen, please allow for natural imperfections. This specimen has been reconstructed and enhanced.