The Geological Evolution History of Zhangjiajie Geopark and the Formation Process of Sandstone-peak Forest in Wulingyuan

摘要

@@The landscape of sandstone - peak forest in Zhangjiajie has experienced very long geological time and formed by inner and outer geological stress. They are un - producible. Their distinct and special natural landscapes are natural camps, walls, peaks and pillars in large number. 1 The regional geological evolution history The landscape of sandstone - peak forest is located in the east margin of the step - style structural belt of Hunan - Chongqing Province, which is a second tectonic unit of Yangtze Plat form. About 750 Ma ago, during the Sinian, the geosynclines development had ended and entered the stage of platform developing. The movement of lithosphere was regional fluctuation of rise and fall. At this time, sea water influxion happened some times. During the time from 750 Ma to 370Ma, which was from Pre- Sinian to Paleozoic, the sea water entered this region all the time and deposition happened. From 370Ma to 345Ma, which was from later Silurian to early Devonian, the regressive events happened and this region uplifted to become land.