FC: Done By: ahmed al buaijan Project:Triassic MS.Moore Class:7-5
1: Table of contents pg.2 introduction pg.3 what is triassic pg4. Triassic climate pg.5 triassic animals] pg.6 triassic plants pg7.summary
2: The Triassic period is a geologic period and system that extends from about 250 to 200 MA if is the first period of Mesozoic era, and lies between the Permian and Jurassic periods Both the stat and the end period are marked by major extinction . The Triassic was named in 1834 by fridechvon Albert Permian–Triassic extinction event, which left the Earth's biosphere impoverished;
3: Roughly 248 million years ago (mya), the Permo-Triassic extinction occurred. This is the largest extinction known. About 95% of all species and about 60% of the genera died out, including many marine animals (like the trilobite). The cause of the Permian extinction might have been global cooling, volcanic eruptions, or a decrease in the continental shelf area during the formation of Pangaea. This catastrophic extinction and continental rearrangement opened the way for the rise of the dinosaurs and mammals. There were no dinosaurs at the beginning of the Triassic, but there were many amphibians and some reptiles and dicynodonts (like Lystrosaurus). During the early Triassic, corals appeared and ammonites recovered from the Permian extinction. Seed plants dominated the land; in the Northern hemisphere, conifers flourish. Glossopteris was the dominant southern hemisphere tree during the Early Triassic period.
4: The vast supercontinent of Pangaea existed until the mid-Triassic Following the Permian extinction, the Triassic oxygen levels were low. For a short time during the early part of the period the oxygen levels gradually climbed, only to plummet even lower than during the Permian as once again mass extinctions ravaged all life on Earth The climate is impacted by the breakup of Pangaea producing more coastal regions and more shallow seas.
5: A specialized subgroup of archosaurs, dinosaurs, first appeared in the Late Triassic but did not become dominant until the succeeding Jurassic. The first true mammals, themselves a specialized subgroup of The | rapists also evolved during this period, as well as the first flying vertebrates, the pterosaurs, who like the dinosaurs where a specialized subgroup of archosaurs.
6: The trend toward aridity continued until deserts and sand dunes were common, replacing the humid swamps of the Carboniferous. About 5 million years into the Triassic there was an extinction event that killed some reptiles, amphibians and nearly destroyed . In terms of the number of species annihilated, the Triassic Extinction is the most significant of any extinction.
7: The Triassic period (248 - 206 million years ago) followed the biggest mass extinction in the history of the Earth, the Permian extinction. This left the Earth relatively unpoplated (especially the seas) and ready for new life. During the Triassic period, the first dinosaurs and the first mammals appeared. Many plant families were culled; giant club mosses and horsetails also went extinct during the late Permian, and new forms evolved during the Triassic. The Triassic was the beginning of a boom in conifers and cycadophytes.