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 Bank dispute in almost all matters except defence and foreign affairs. Consequently, their interests in Rockall are represented by Denmark. On their behalf, Denmark claims continental shelf rights in the Hatton-Rockall area. A communiqué issued by the Prime Minister's Office on 7 May 1985 announced the designation of not only the seabed in the immediate vicinity of the Faroes but also a vast area of the Rockall plateau to the south west. The press release which accompanied the communiqué indicated that the legal basis of this designation was the assumption that "the Faroe Islands are part of the microcontinent" formed by the