• Mesa
  • Yantan 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.

Yantan District belongs to Zigong City, Sichuan Province, named after the district government stationed in Yantan Town. It was founded in 1953 and is located at the south gate of Zigong City. It is the hometown of martyr Lu Deming, commander of the Autumn Harvest uprising, and is one of the four municipal districts of Zigong City, the salt capital of the millennium. 12 kilometers away from Zigong City. The north is bordered by Da'an District, covering an area of 467.99k. The outline of the area is full of triangles, the landform is mainly hilly, the terrain is high in the northwest and low in the southeast, with an average elevation of 300 li 400 meters. Belongs to the gentle slope low hill, the gentle slope middle hill landform type, does not have the shape mountain range, suitable for ploughing area is large. At the end of 2011, the area of cultivated land along the beach was 258700 mu, including 163100 mu of paddy field, 95700 mu of dry land and 0.77 mu of per capita arable land.
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