• Mesa
  • Minxian

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.

Minxian, which belongs to Dingxi City, Gansu Province, is named because of Minshan, which is located in the south of Dingxi City, Gansu Province. The establishment of Minxian County can be traced back to the eighth year of Qin Wangzheng (239 BC), which was called Lintao, which was the western starting point of the Qin Great Wall. Minzhou was established in the 10th year of Emperor Wendi's Great Unification of the Western Wei Dynasty (AD 544), changed to Minxian County in 1913, and was placed under the jurisdiction of Dingxi after 1985. Minxian County has jurisdiction over 9 townships and 9 towns, with a total area of 3578 square kilometers and a total population of 490300 (2014). The government is resident in Minyang Town. Minxian County is located on the edge of the Qinghai-Tibet Plateau, is the Gannan grassland to the Loess Plateau, Longnan mountain transition zone, the territory elevation of 2040-3754 meters, known as "Longyuan dry Wharf". The climate is plateau continental climate, low temperature and dry, frequent natural disasters.
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