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.
Maoming is a prefecture-level city of Guangdong Province. It is located on the coast of the South China Sea and in the southwest of Guangdong Province. It is bordered by Yangjiang City in the east, Nanhai City in the south, Zhanjiang City in the west, Yunfu City in the northeast, and Yulin City in Guangxi in the northwest. Maonan, Dianbai two municipal districts, escrow Gaozhou, Huazhou, Xinyi 3 county-level cities. There are three economic functional areas: Maoming Binhai New area, Maoming High-tech Zone and Maoming Shuidong Bay New City. Maoming is an important petrochemical and energy base in the country. It is rich in products. Maoming is also an important agricultural city and fruit production base in Guangdong Province. It is rich in aquatic products. Bohe, Shuidong and Dongshan Port are famous fishing ports in the province. Maoming county economy has developed steadily and has been in the forefront of eastern and northwestern Guangdong for a long time. ...