Top rare tiny Mosasaur species, Halisaurus arambourgi, from the Upper Cretaceous phosphate deposits in the Oulad Abdoun Basin of Morocco.This partial maxilla still have preserved 4 teeth. 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. With the extinction of the ichthyosaurs and decline of plesiosaurs, mosasaurs diversified to become prolific apex predators in nearly every habitat of the oceanic world. Species: Halisaurus arambourgii - Mosasaur Locations: Oued Zem, Morocco Geological Formation: Ouled Abdoun Phosphate Beds Size: 19 x 12 cm Ref: 1249 All our fossils comes with Certificate of Authenticity.