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 Rockall Bank dispute Several states have claimed interests over the sea bed adjoining Rockall. Denmark (for the Faroe Islands), Iceland, Ireland and the United Kingdom have all made submissions to the commission set up under the United Nations Convention on the Law of the Sea (UNCLOS). The United Nations Convention on the Law of the Sea states, "Rocks which cannot sustain human habitation or economic life of their own shall have no exclusive economic zone or continental shelf." The convention was ratified by all four states in dispute over the Rockall Plateau – Iceland on 26 January 1985, Ireland on