• Mesa
  • Pengshan 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.

Pengshan District is the municipal district of Meishan City, Sichuan Province, known as Wuyang in ancient times. Pengshan covers an area of 465.32 square kilometers and has jurisdiction over two subdistrict offices, eight towns and three townships, with a permanent population of 320100 in 2017. Pengshan is the hometown of longevity in China, the production base of Chinese commercial grain and lean pigs, and the national ecological demonstration area. Pengshan District is bordered by Renshou County in the east, Dongpo District in the south, Pujiang County and Qionglai City in the west, and Xinjin County and Shuangliu District in Chengdu in the north. Pengshan is the main habitat of Pengzu, the first ancestor of Chinese birthday, and is known as the "hometown of longevity". It is the only "hometown of longevity in China" demonstrated by multi-disciplinary experts.
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