• Mesa
  • Xietongmen 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.

Xietongmen County, which belongs to Xigaze City, is located in the northwest of Xigaze City in Tibet Autonomous region and on the north bank of the Brahmaputra River. It is bordered by Nanmulin County and Sangzhuzi District of Xigaze City to the east, Shenza County of Naqu City to the north, Anren County to the west, and Sakya County and Lazi County to the south. Located in longitude 87 °4'to 89 °1, latitude 29 °18'to 30 °26, the county people's government is stationed in Kaga town. The county seat is 83 kilometers away from the people's Government of Xigaze City. As of 2014, Xietongmen County has jurisdiction over 1 town and 18 townships, with a total area of 13960 square kilometers. The total population is 47000 (2015). From January to May 2014, Xietongmen County completed 60.21 million yuan in tax revenue, accounting for 70.8 percent of the annual plan, with an increase of 28.38 million yuan, an increase of 89.2 percent over the same period last year. The first half year
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