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 for Kilmarnock, said: "More people have landed on the moon than have landed on Rockall." Rockall is one of the few pinnacles of the surrounding Helen's Reef; it is located 301.3 km, or 162.7 nmi west of the island of Soay, St Kilda, Scotland, and northwest of Tory Island, County Donegal, Ireland. Its location was precisely determined by Nick Hancock during his 2014 expedition. The surrounding elevated seabed is called the Rockall Bank, lying directly south from an area known as the Rockall Plateau. It is separated from the Outer Hebrides by the Rockall Trough, itself located within the Rockall