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The great basaltic sheets of the Cape Colony are found capping the highest elevations of the Camderboo and Stormberg ranges, as well as overspreading immense areas of less elevated land, to an extent, according to Professor A. H. Green, of at least 120,000 square miles. Amongst these sheets, innumerable dykes, and masses of solid lava which filled the old vents of eruption, are to be observed.
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