• Mesa
  • Tianshan District

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.

Tianshan District, which belongs to Urumqi City of Xinjiang Uygur Autonomous region, is the political, economic, cultural and financial center of Urumqi City, and is home to the head organs of the Party, government, army and Xinjiang production and Construction Corps of the Autonomous region and Urumqi City. The area covers a total area of 216square kilometers, which is inhabited by 44 ethnic groups, including Han, Uygur, Hui and Kazakh, with a resident population of 471432 (2010). It has jurisdiction over 7 district management committees, 11 streets, 178 communities, 1 village and 1 pasture.
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