Mesozoic Era is divided in to 3 periods:
1. Triassic Period (225-195 million years)
* Pangea- a united super continent
*Morganucodon, the earliest known mammals appear (looked like a tiny rat)
* Evergreen plants existed everywhere
*Eoraptor (or dawn thief) appears; the earliest known dinosaurs was about 1.00 metres long and meat eater
* Herrersaurus appears; was 3.00 metres long and meat eater
*Plesiosaurs, a long-necked large marine reptile and Ichthyosaurs, looked like dolphin, ruled the seas.
2. Jurassic Period (195 to 135 million years)
* Flowering plants appear
* Sauropods (plant eaters) like Apatosaurus, the deceptive lizard (21 metres long, lived in W. US) and Brachiosaurus - the biggest land creatures ever lived. They were eaten up by meat eating Allosaurus and Megalosaurus
* Archaeoterpyx appears - supposed to have features of a bird
* Pterosaurs, flying reptiles and relative of dinosaurs, ruled the sky
* Stegosaurus, the plated lizard, ate plants, about 180 metres long and lied in N. America.
3.Cretaceous Period (135 to 65 million years)
* no polar ice existed
* Velociraptors, the speediest, mean eating and lived in Asia. It was 1.80 metres long
* Triceratops (3-horned face) the plant eating 1.80 metres long creature lived in N. America
* Hadrosaurus, the big lizard, fed on plants, 1.80 metres long and was found in Asia, Europe, N & S America
* Theropods like Tyrannosaurus Rex, the tyrant lizards, (also T-Rex, 12 metres long, lived in Asia, W.US and Canada) and Giganotosaurus ate meat and walked on two legs
* All Dinosaurus and other reptiles such as lchthyosaurus and Pterosaurus became extinct due to unknown reasons.
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