Plesiosaurus dolichodeirus Ankylosaurus Because the plants and animals

Because the plants and animals were deposited at the bottom of these lakes where there was little or no oxygen present

with a curved

usually less than 30 meters deep

Crinoids are assigned to the phylum Echinodermata

Ogam (Ogham)

Plesiosaurus dolichodeirus Ankylosaurus Because the plants and animalsPleisosaur Full Skeleton On Slab from the Jurassic of Glastonbury, England. Plesiosaurs (meaning "near lizard") were flippered marine reptiles from the Mesozoic Era they were not dinosaurs. Plesiosaurs are divided into two groups: the Plesiosauroids with long, snake like necks, tiny heads, and wide bodies, and the Pliosauroids, which had large heads with very strong jaws and short necks. The first plesiosaur skeletons were found in England by Mary