地球历史(中生代（History of the earth (Mesozoic era)）.doc

地球历史(中生代（History of the earth (Mesozoic era)） (two) the Mesozoic (250 million years ago - 65 million years ago) (1) the Triassic (2.5 - 205 million years ago) Triassic (Triassic) is the name of Friedrich in 1834?? Albert mentioned, he will be widespread in Central Europe in the white limestone and black shale of the red rock layer three layer called the triassic. Today, the Triassic is divided into more sub layers. 1. ancient geography Pangea (Pangea) is the formation of Devonian began in the mainland and mainland, through continuous collision between each other, until the Late Triassic, which leads to the forming of the super continent. 2. climate In the hot and dry climate, which can now see the left at the typical red sand. At that time there is a strong seasonal, rainy season. In polar humid mild. 3. biological earliest mammals and angiosperms, dinosaurs began to appear Mammals first appeared in the Late Triassic, belongs to the original animal suborder (past separate suborder was oviparous insectivorous animal beast). In Triassic pterosaurs and multi class dinosaur ancestor groups, including the dragon and the Dragon tooth plate. The worlds oldest tortoise - the original turtle also appeared in the Late Triassic jaw. In the ocean of new coral species was born, they are composed of relatively small corals. The software of the Nautilus from the animal only survived a Permian Triassic extinction event of the recovery, the formation of a new species. The beginning of the fish species is relatively small, only a few species survived the disaster not long ago. The first batch of ichthyosaurs appeared. The surviving on the mainland plants cycads, Lycopodium and glossopteris. In the northern hemisphere, conifers relatively lush in the southern hemisphere in the Early Triassic is the main Glossopteris trees. 4. of the fourth mass extinction event In the end Triassic extinction event, especially for the marine organisms to destroy its heavy: conodont extinction in marine