Pliosaur tooth, giant marine reptile Troodon They were first found and

They were first found and described by John Locke in 1838

Specimens are known to have been made of flint

This large enrolled trilobite is from the Devonian of the Alnif region of Morocco

Crinoids are animals despite their plant-like appearance

Pliosaur tooth, giant marine reptile Troodon They were first found andPLIOSAURUS(pronounced PLY oh SAWR us) Pliosaurus (meaning "greater lizard") was a huge, short necked plesiosaur that lived during the middle to late Jurassic period. This carnivore was a flippered marine reptile (a pliosaur and a plesiosaur, but not a dinosaur) with many sharp teeth in large, powerful jaws resembling those of a crocodile; the teeth were three sided in cross section. It was 33 40 ft (10 12 m) long and the skull was 5 6. 6 ft (1. 5 2 m)