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Within the scope of the park, the granite in the mountains is full of spherical weathering development, and its shapes are dazzling, some are like bird"s nest, some are like cut green onions, and some are like eggs on a rock wall. Formed scenic spots such as: The Dawei Mountain area is a granite mid-mountain landform. The formation of the landform is not only the erosion of running water and weathering and denudation since the Quaternary, but also the landform formed by the erosion and accumulation of Quaternary glaciers. Unique... |
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A U-shaped valley is a trough with a wide base, steep slope, U-shaped cross section and a stepped cross section when the ice tongue protruding from the ice bucket or ice cellar erodes, digs (pulls) and erodes the ice bed rock when flowing in the valley. Shaped valley. Such popular glacier tracks in Daweishan Geopark are developed on the northern slope of the mountain than on the southern slope, and the process is also longer. On the north slope, there is a boat bottom nest-sumu bridge U-shaped valley, Yuquan Temple (remains)-Xishangzi-Shiyangcheng U-shaped valley, Qiu’s old house-Dawangkeng U-shaped valley, etc.; on the south slope, there is a water-flooded dam-Wenzhu U-shaped valley and so on. Take the boat bottom nest on the north slope-the U-shaped valley of the Sumuqiao (Lushan Ice Age, Q3) as a representative narrative. This trough is formed by flowing and abrading the ice tongues that protrude from the ice bucket of Tianxing Lake and the ice cellar of the bottom of the ship in the valley. The longitudinal section is stepped, with a width of about 200-300m, the elevation of the trailing edge is about 1300m, and the elevation of the front edge is about 700m. From the trailing edge to the west about 2000m, there are continuous four-level rock sills (ice sills). The first level ice sill at the east end is about 1300m high, and the fourth level ice sill at the west end is about 740m high, with a drop of 460m. The ice ridge lies across the valley contraction, making the entire trough appear as an east-west stepped gourd valley. The cross-sections of these ice sills appear to be steep in the east and steep to the west, and a clear vertical bedrock ice skating surface remains on the west side of the second-level ice sill (near the single-plank bridge). From the vicinity of the Zhuangshishi to the west, side moraine dikes (maulite moraines) are piled up by huge and varying sizes of granite boulders, which extend concentratedly for about 600m and intermittently extend for more than 1km. |
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The ice cellar is the source of the valley"s glaciers and the bedrock depressions where ice is stored. The entire terrain is an enclosure-like basin surrounded by mountains on three sides and a flat bottom. The exit is connected to the U-shaped valley, a popular glacier trail, and some have rock ridges across the exit. The ice cellars in geoparks often take the form of muddy garden-shaped or long-striped mountain wetlands, ranging in area, with a single area of more than 20h square meters, and the largest one is Shiquan Lake, with an area of more than 90h square meters. The remains of the Lushan period ice cellars in the Geopark are generally distributed in a zone of about 1400m. Ice cellars are poorly preserved during the glacial period (Q2). There are Shuidaba ice cellars and Shigutian (mountain) ice cellars, which are distributed in the area of 650-800m above sea level. |
| Sheep back stone is also called:sheep front stone. It is a rocky hillock formed by ice erosion. Especially in continental glacier zones, rocky hillocks are often distributed along with rocky depressions and lake basins, crawling on the ground in groups, like a flock of sheep lying on the ground. Therefore, it is called sheep is back stone. It is formed by grinding hard rocky hills by glaciers. The top is rounded and resembles a sheep is back. Has an oval base. The direction in which the long axis extends is consistent with the direction of glacier movement. The longitudinal profile is asymmetric from front to back: the ice facing slope is generally gentle and smooth; the back ice slope is steep and rough. In most areas where sheep is back stones are distributed, the ground is undulating.
The reason is that the flat side is dominated by abrasion, while the steep side is dominated by digging and there are caves. The direction of the long axis of the sheep is back stone is parallel to the direction of the glacier movement, so the sheep is back stone can also indicate the direction of the glacier movement. |
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The granite mountain has undergone the alternate evolution of glacial and interglacial climate since the Quaternary. The advent of glaciers is dominated by erosion, abrasion, and digging (digging) erosion, accompanied by the erosion of glacier water on both sides of the glacier and the bottom of the glacier, which promotes the erosion of ice buckets (cellars) toward the source, and the trough slopes recede and the bottom widens. During the interglacial period, the climate was warm; glaciers no longer existed, instead the erosion of running water was the main feature, and the icy erosion terrain was transformed. The erosion of flowing water, especially the diffusive effect, caused the granite mountain body to suffer from the spherical weathering of the surface, the erosion of the flowing water and the splitting of plant roots, forming an exposed stone egg landform, which is huge and piled high. Because of its shallow weathering in the exposed surface environment, the sphere is not perfect. This type of stone egg landform is relatively rare in this area. Wuzishi can be represented. Although the white-faced stone is shown as a rock wall with cylindrical joints, this type of stone egg landform is actually a remnant of the destruction of the stone egg landform. The Dawei Mountain is mainly a buried stone egg landform. It is not dominated by erosion, but water, gas and various microorganisms invade along the granite joints and fissures, weathering and spalling from the surface to the inner layer, and the inside of the rock block is not weathered. Some of them are spherical, and the remaining spherical rocks are called stone eggs. They are perfectly spherical and small in size. |
Copyright: Dawei Mountain National Forest Park, Hunan Province