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 fishing rights. Lord Kennet said of Rockall in 1971, "There can be no place more desolate, despairing and awful." It gives its name to one of the sea areas named in the shipping forecast provided by the British Meteorological Office. Rockall has been a point of interest for adventurers and amateur radio operators, who have variously landed on or briefly occupied the islet. Fewer than 20 individuals have ever been confirmed to have landed on Rockall, and the longest continuous stay by an individual was 45 days in 2014. In a House of Commons debate in 1971, William Ross, MP