Abstract
Abstract The eastern highlands of Nigeria are reviewed from the Chad Basin to the coast of Mount Cameroon. A high-level surface, identified as the “Gondwana” surface, is recognised in fragmentary form for over 500 miles, at varying altitudes from 3,000 feet upwards. Forming clear plateau surfaces in some areas, in others this surface is dissected to give only isolated residuals or summit planes, or is buried beneath volcanic rocks. The latter show two phases of accumulation, the older flows being completely decomposed and showing a local “post-Gondwana” bevelling similar to that reported earlier on the Jos Plateau in Northern Nigeria. The altitude of the “Gondwana” remnants suggests a rise towards the Benue Trough comparable with the “rise to the rift” already recognised on the Jos Plateau on the opposite side of the great river. Along the length of the highlands a double lower surface is identified, correlated with the double “African” surface previously described in Northern Nigeria. There is a marked c...
Published Version
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