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
Rockall Information request in 2012, the British Government stated that, "The islet of Rockall is part of the UK: specifically it forms part of Scotland under the Island of Rockall Act 1972. No other state has disputed our claim to the islet." In Scotland it is part of South Harris Parish. Responding to a written parliamentary question in 2016, the Irish Minister for Foreign Affairs said: "The UK claims sovereignty over Rockall and has sought to formally annex it under its 1972 Island of Rockall Act. While Ireland has not recognised British sovereignty over Rockall, it has never sought to claim