Sunday, 26 July 2015

Thursday, 16 July 2015

ICHTHYOSAUR EVOLUTION

During the early Triassic period, ichthyosaurs evolved from a group of unidentified land reptiles that returned to the sea. They were particularly abundant in the later Triassic and early Jurassic periods before being replaced as premier aquatic predator by another marine reptilian group, the Plesiosauria, in the later Jurassic and Cretaceous periods.

Tuesday, 14 July 2015