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 The Baracuda-style naval patrol, search and rescue vessel, Thunder Child, completed the route in 34 hours, 1 minute, and 47 seconds. Set on an anti-clockwise direction, the new record – the first of its kind - is now subject to ratification by Irish Sailing and the Union Internationale Motonautique, the world governing board for all powerboat activity. The UK claims Rockall along with a territorial sea around the islet inside the country's exclusive economic zone (EEZ). The UK also claims "a circle of UK sovereign airspace over the islet of Rockall". The UK claimed Rockall on 18 September 1955 when