Abstract
IN the first Bulletin of the Nigerian Geological Survey Dr. Falconer has given a useful account of the tin-bearing region of the Protectorate. Ancient schists and gneissose granites have been invaded by newer granites, followed by emanations rich in tin and fluorine but not in boron. Long afterwards, when the country had been worn down by atmospheric agencies, it was covered by the “Fluvio-marine Series”—volcanic rocks, and river gravels often rich in tin. Still later these were succeeded by younger volcanic rocks which have in some cases capped and preserved the older sediments. The alluvial beds that are still in process of formation are, however, the chief source of tin. Their investigation not only furnishes information on the occurrence of alluvial tin, but throws light on the problems of river erosion and deposition. The publication under notice, which is illustrated by excellent photographs of scenery and micro-sections as well as by maps, will be welcomed both by geologists and by mining engineers, though some analyses of the chief rock-types would have been a useful addition.
Geological Survey of Nigeria. Bulletin No. 1. The Geology of the Plateau Tin Fields.
By Dr. J. D. Falconer. Pp. 55 + x plates. (Nigeria: Geological Survey of Nigeria, 1921.) 10s. net.
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EVANS, J. Geological Survey of Nigeria Bulletin No 1 The Geology of the Plateau Tin Fields. Nature 107, 679 (1921). https://doi.org/10.1038/107679a0
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DOI: https://doi.org/10.1038/107679a0