• Mesa
  • Changyi 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.

Changyi District belongs to Jilin City, Jilin Province, located in the northwest of Jilin City. Changyi District is the economic center of Jilin City, with a total area of 769.92 square kilometers, ranging from 43 °50 °N to 44 °6 °35 "N and 126 °31 °E to 126 °47'E. it is surrounded by rivers on three sides and mountains on one side. In 2012, Changyi District, with a total population of 622800, had jurisdiction over 16 streets, 3 towns, 2 ethnic townships and 3 provincial open zones. The annual GDP reached 29.48 billion yuan, an increase of 8.7% over 2011.
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