Rockall Helen's Reef (the latter was named in 1830). Notes Bibliography Rockall Rockall () is a British uninhabited granite islet located within the exclusive economic zone (EEZ) of the United Kingdom, situated in the North Atlantic Ocean. Its approximate distances from the closest large islands are: west of Scotland; northwest of Ireland; and 700 km (440 miles) south of Iceland. The nearest permanently inhabited place is North Uist, an island in the Outer Hebrides of Scotland, 370 km (230 miles) to the east. The United Kingdom claimed Rockall in 1955 and incorporated it as a part of Scotland in 1972. Ireland
Benue Trough period is also found only in the south of the trough, and may be related to an isostatic response to the earlier crustal thinning. The mantle plume activity was probably limited in its effect, with most of the basins in the trough being created from a combination of extension and strike-slip faults. The faults extend into the ocean with the Chain and Charcot fault zones, and have their counterparts in northeastern Brazil. Nigeria is rich in coal deposits derived from terrestrial organic matter, most of which lie in the Benue Trough. These are mined in Enugu State. The Enugu deposits