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 (band) engineer. Ruairidh Howells returned to the band some years later to play drums, mandolin and saxophone, alongside Pete Scott (fiddle, bass), Seán Mac Labhraí (piano, bouzouki), Marjolein Poortvliet (fiddle), Mike Coughlan (uillean pipes) and Jack Harris (guitar). Jack Harris maintains a parallel solo career, performing songs rather than Rockall's preferred instrumentals. Rockall's first album is due for release in the second half of 2018. It has been provisionally titled "Northwesterly, Good", a reference to the UK Shipping Forecast in which the island features. Rockall (band) Rockall is a band named after the island off the west coast of Scotland, who