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.
Pujiang County belongs to Jinhua City, Zhejiang Province. Pujiang County covers an area of 920 square kilometers and has jurisdiction over 7 towns, 5 townships and 3 streets, 409 administrative villages and 20 communities, with a registered population of 380000 and a migrant population of 100000. Pujiang has a long history. It has a history of more than 1800 years since the county was established in the second year of Xingping in the Eastern Han Dynasty (AD 195), Puyang County was bought in the 13th year of Tang Tianbao, and Puyang was changed to Pujiang in the third year of Wuyue Tianbao. Zhejiang-Jiangxi Railway, two provincial highways (Hangjin Highway and Jiang Yi Line) and Shanghai-Kunming Expressway are crossing the border. Yiwu Civil Aviation Airport is located at the junction of Puyi. The county's roads extend in all directions and have complete power supply and communication facilities, which has broad prospects for economic development. Pujiang County, located in the middle of Zhejiang Province, belongs to Jinhua, Zhejiang Province. Celebrities of past dynasties