Plesiosaur Tooth in Matrix display dentatus is a primitive relative

dentatus is a primitive relative of the modern day herring

by fluvial activity in fluctuating river channels and deltas and very occasional peaty swamp deposits along the low-lying eastern continental margin fronting the late Cretaceous Western Interior Seaway

This is a top quality Struthiomimus foot claw from the Judith River Formation in Montana

Mammuthus columbi

Plesiosaur Tooth in Matrix display dentatus is a primitive relativeZarafasaura oceanis Late Cretaceous (~70 million years ago) Phosphate Deposits Oulad Abdoun Basin, Morocco Tooth approx. size: 1. 5" Matrix approx. size: 2. 75" x 2. 5" x 1. 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