• Mesa
  • Yanjiang 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.

Yanjiang District, which belongs to Ziyang City, Sichuan Province, is located in the central heart of Sichuan Basin, adjacent to Neijiang, Chongqing, Suining and Meishan. It has jurisdiction over 22 townships, 4 streets, 457 villages and 57 communities, covering an area of 1632 square kilometers, with a total population of 1.09 million (2012), including an agricultural population of 870000. Yanjiang District, which is the political, economic and cultural center of Ziyang City, is the seat of the CPC Ziyang Municipal Committee and the Ziyang people's Government. In 2014, Yanjiang District ranked 13th in the comprehensive evaluation of county economy in Sichuan Province.
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