Dinosaur Periods

By markmarshall

  • Permain Period. 286 million years ago.

    The first sail back reptile appeared.
  • Period: to

    timespan

  • Triassic Period.245 million years ago.

    First dinosaurs, mammals, and frogs appeared.

  • Jurassic Period. 208 million years ago.

    First birds.

  • Cretacious Period. 144 million years ago.

    Dinosaurs died out. First snakes and modern mammals appeared.