• Mesa
  • Chongxin County

A mesa is an isolated, flat-topped elevation, ridge or hill, which is bounded from all sides by steep escarpments and stands distinctly above a surrounding plain. Mesas characteristically consist of flat-lying soft sedimentary rocks capped by a more resistant layer or layers of harder rock, e.g. shales overlain by sandstones. The resistant layer acts as a caprock that forms the flat summit of a mesa. The caprock can consist of either sedimentary rocks such as sandstone and limestone; dissected lava flows; or a deeply eroded duricrust. Unlike plateau, whose usage does not imply horizontal layers of bedrock, e.g. Tibetan Plateau, the term mesa applies exclusively to the landforms built of flat-lying strata. Instead, flat-topped plateaus are specifically known as tablelands.

Chongxin County is located in the east of Pingliang City, bordered by Jingchuan and Lingtai counties to the east, Huating County to the west, Kongtong District to the north, and Longxian County, Shaanxi Province to the south, between 35 °1 Latitude 35 °25 °N and 106 °50 °E, 107 °10'. The total land area is 850km2, with a width of 35km from east to west and 41.5km from north to south. The climate is warm and semi-arid continental climate zone. It is cold and dry in winter and spring, warm and rainy in summer and autumn, with an annual average temperature of 10.7km2, sunshine of 2296 hours, rainfall of 400ml / 500mm and frost-free period of about 190days. In February 2018, Chongxin County had jurisdiction over 4 towns, 2 townships, 1 industrial concentration area, 1 urban community management committee, 79 administrative villages and 410 cooperatives, with a total population of 103500, including agriculture.
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