In the Mesozoic, the time of the dinosaurs, from 252 to 66 million years ago, marine reptiles such as ichthyosaurs and plesiosaurs were top predators in the oceans. But their origins and early rise to ...

Setting the stage : the Mesozoic era -- Dawn of an era : life from the Triassic -- Before the ocean : animals and plants of the Jurassic -- The great inland sea : Australia in the early Cretaceous -- ...