Labels:text | screenshot | font | number | document OCR: The Mesozoic Era Environment The Age of Dinosaurs is the Mesozoic Era, which In general, the climate of the Mesozoic Era was warmer divided into three periods: the Triassic (245-208 m than that of today, and there appears to have been little years ago), Jurassic (208-145 million years ago), difference between summer and winter. It is incomplete, Cretaceous (145-66 million years ago). The earlies however, to picture dinosaurs as moving through either dinosaur fossils, recently discovered in Argentina's a tropical or desert landscape. These settings did exist, Ischigualasto basin, have been radiometrically-dat but there were forests, as well, and a range of mild 228 million What Were Dinosaurs? disactos le whatever mental picture of dinosaurs and scientists t hat one develops, there should be America as Ask the average person what dinosaurs were, and he plant missing -- throughout the 163 million might tell you that dinosaurs were huge, cold-blooded, re were no grasses! Small ferns of the Creta slow-moving, dim-witted reptiles that ruled the Earth ground cover there was. The Earth's millions of years ago and became extinct suddenly and $ that at the beginning of the Triassic quite differe completely in some sort of catastrophe. Actually, the only undisputed truth in this The Great Extinction the different seems roch commonly-held view is that the dinosaur; The various theories of the extinction of dinosaurs ha changing c extinct suddenly in some sort of catastro only one thing in common: the fact that, all of the extremely § may not be true, either! dinosaurs died out completely and suddenly 66 millio States is m Size years ago, after having been very successful animals of one to th The Fossil Remains of Dinosaurs contrast, the human fami known as C Dinosaurs years.) The rate of larger than If dinosaurs died out 66 million years ago, how do we mentioned, know as much about them as we do? Nearly all of what dinosaurs died out is kno year, is ins Apatosaur we know about dinosaurs is based upon the story that stands for Cretaceous (C continent m fossils tell. 80-year life of Tyrannos r Carboniferous); the T Triceratops when mammals began the past, we ar Fossils are the remains of long-dead plants or animals. A lot can ha and many When an animal dies, its body can be eaten by other much a ca animals, it can slowly rot away until nothing is left, or it ve term; in this case, it When the T only about can be buried by sand or mud. If is buried by mud or ousands of years. In other ut suddenly only in the
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