The Cretaceous period was the final of the three periods into which we divide the Mesozoic Era (the previous periods being the Triassic period, and the Jurassic period), and occured between 144 million and 65 million years ago.
Many well-known types of dinosaurs lived during the Cretaceous, including Ankylosaurus, Iguanodon, Pachycephalosaurus, Protoceratops, Spinosaurus, Styracosaurus, Triceratops, Tyrannosaurus rex, and Velociraptor. It was also during the Cretaceous period that the first flowering plants ("angiosperms") began to appear, including, for example, beech, fig and magnolia.
At the end of the Cretaceous period (known as the K-T boundary), dinosaurs, and and a variety of other animals all suddenly became extinct. There have been many theories proposed for why this mass extinction occured.
The Cretaceous world was cooler than it had been in the previous Triassic and Jurassic. periods, but still warmer than that of today. At higher latitudes snowfalls became common, although the climate generally remained warm even at such latitudes - glaciation was restricted only to alpine regions in high latitudes. Meanwhile, tropical parts of the globe were much wetter than they had been previously.
Here are some of the types of dinosaurs that lived during the Cretaceous period:
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