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The Cretaceous

Fossil When: 144 to 65 million years ago.

Animals: Reptiles still dominate land, sea and air. Dinosaurs - like Tyrannosaurus rex, Iguanodon and Triceratops - are common; pterosaurs fly in the skies; mososaurs and other marine reptiles swim in the oceans. Echinoderms (starfish snd sea urchins) and molluscs - like snails, bivalves, ammonites and belemnites also live in the oceans.
Plants: Flowering plants become much more common.

Firsts: Bees pollinate flowers for the first time.
Lasts: Many groups died out at the end of the Cretaceous. Ammonites, dinosaurs and many other reptiles became extinct.

Notes: Scientists think that an asteroid hit the earth at the end of the Cretaceous, causing the extinction of the dinosaurs and other groups.

Identify the fossils on this page - click on the pictures to see if you are right!
Remember, some of the fossils are actually much bigger than the pictures shown here.

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