The Triassic Period began 245 million years ago and continued
for 35 million years. The Earth's landmass were joined in a single
continent called Pangea.
Many new forms of life including primitive dinosaurs and
mammals appeared. Reptiles and dinosaurs dominated began a great
radiation which was to continue throughout the Mesozoic Era.
They also carved out niches in the air and sea. There were flying
reptiles, the pterasaurs, and marine reptiles including
ichthyosaurus and pleisosaurus. Fish still dominated
the sea, and insects still dominated the air. The first tortoises
and turtles appeared.