Platecarpus ictericus, mosasaur skull, marine reptile Protoceratops Its heavyweight was supported by

Its heavyweight was supported by the last seven tail vertebrae

herbivorous dinosaurs

and Clovis-style points disappeared from the continental United States

Lystrosaurus was by far the most common terrestrial vertebrate of the Early Triassic

very reptile-like tetrapods that lived during the Early Permian

Platecarpus ictericus, mosasaur skull, marine reptile Protoceratops Its heavyweight was supported byMosasaurs were a group of predatory marine reptiles that were very successful during the Late Cretaceous Period. The first mosasaur fossils were found in the 1770's in a mine in the Netherlands, more than 50 years before the first dinosaur bones were found. Mosasaurs were among the first fossils recognized and scientifically described. "Mosasaur" means "reptile of the Meuse," a river near the quarry where mosasaurs were first found. Mosasaurs were