Plesiosaur Tooth in Matrix Claw The Hell Creek Formation is

The Hell Creek Formation is an intensely-studied division of Upper Cretaceous to lower Paleocene rocks in North America

Mosasaurs had huge

which was followed in turn by the pygidium

near Jordan

about 500 miles north-northwest of Buenos Aries

Plesiosaur Tooth in Matrix Claw The Hell Creek Formation isZarafasaura oceanis Late Cretaceous (~70 million years ago) Phosphate Deposits Oulad Abdoun Basin, Morocco Tooth approx. size: 1. 5" Matrix approx. size: 3" x 2. 5" x 2. 25" Plesiosaurs were marine reptiles that appeared in the Triassic and died out along with the dinosaurs at the end of the Cretaceous period. They had a broad flat body and a short tail. Their limbs were four powerful flippers that made a flying movement to propel the plesiosaur