• Mesa
  • Yuzhong 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.

Yuzhong County, under the jurisdiction of Lanzhou City, Gansu Province, is located in the central part of Gansu Province, near Qilihe and Chengguan District to the west, Anding District of Dingxi City to the east, Lintao County to the southwest, Pingchuan District of Baiyin City to the north, and Jingyuan County and Huining County to the northeast; it is high in the south and low in the middle, with a temperate continental climate, with a total area of 3301.64 square kilometers, and has jurisdiction over 8 towns and 15 townships. In 2017, there are 13 ethnic minorities with a registered population of 469083. Yuzhong County passes through the ancient Silk Road in three ways. Xinglong Mountain is a national 4A scenic spot and a national nature reserve. Qingcheng, an ancient town, is listed as a "national historical and cultural town" because of its historical and cultural relics and the ancient buildings of the Ming and Qing dynasties. The traffic in the county is more developed, such as Lanxin second Line, Lanyu Railway, Baolan passenger Special Railway, etc.
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