The Changes and Development in the Devonian Era Essay

Late Paleozoic is divided into the Devonian, Carboniferous and Permian periods, which lasted 170 million years in a total. The sediments of these periods compose appropriate systems, which together form the Upper Paleozoic subgroup. Devonian sediments were first described in the English county of Devon. Devonian period, in turn, is divided into three other internal periods Early, Middle and Late Devonian period, which differ in climate, geographical and biological conditions.In Devonian northern continents formed a single large continent Atlanta, which was located in the eastern Asia. Gondwana continued to exist. Huge continent were blocked by mountain ranges that break down, filling cavity between the mountains. The climate was dry and hot. Lakes and lagoons were dried up, and formed part of the salt water and gypsum precipitation, generating a salt and gypsum-bearing strata.Devonian period, in contrast to other periods of the Paleozoic era, is characterized by the relatively small scale of the major structural changes of the crust. Devonian is the fourth geological period from the beginning of the Paleozoic Era about 60 million years ago. At the beginning of Devonian, as a result of Caledonian orogeny, occurred raising vast areas of the earth's surface, which have accumulated powerful red-lagoon-continental sediments of old red sandstone. In the middle and late Devonian immersion and extensive marine transgression were observed among platforms and geosynclines. Throughout the whole period, magmatic activities (especially effusive) showed their activity in geosynclines and less on platforms in different regions and in some areas there was an accumulation of halogen precipitation (Rudwick, 1988).The beginning of the Devon period was characterized by the end of the Caledonian orogeny, and in some areas the formation was made by mountain folded structures. However, stabilized Caledonian structures were not transferred to the platform stage of the development, and Caledonian structures were formed within them by the so-called overlay sediments or inherited basins. With the end of the Caledonian orogeny period a new era tectogenesis - Hercynian began...

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