Benue Trough the Central African Shear Zone and for the volcanic island of St. Helena in the Atlantic ocean. Three periods of magmatic activity (volcanic action) have been identified, 147–106 Ma, 97–81 Ma and 68–49 Ma. The first is prominent in the north of the trough, and contemporary with magmatism in Brazil, probably occurring during a period of crustal extension before the Atlantic started to open. The second is found only in the south of the trough, and may belong to a period when the extension of the Atlantic had slowed down, ending with a period of compression. The third and last
Oil Trough, Arkansas Oil Trough, Arkansas Oil Trough is a town in Independence County, Arkansas, United States. The population was 260 at the 2010 census. The town is believed to have acquired its name in the early 19th century from a trough used to render bear fat, which was sold to customers in New Orleans. Oil Trough has been noted for its unusual place name. Odell Pollard, a retired attorney from Searcy and the Arkansas Republican Party chairman from 1966–1970, graduated from Oil Trough High School. Oil Trough is located on the south bank of the White River along Arkansas Highway 14 between