Several stages of serpentinization are recognized in the peridotites (dunites with some wehrlitic dunites) forming the substratum of the Kaloum peninsula and the Conakry area in the Republic of Guinea. The rocks are described, the different minerals recognizable under the petrographic microscope are listed, and the problems of serpentinization and the peridotite magma are discussed. The peridotites may represent extensions of the rocks of the Kakoulima massif; if so, they constitute a dike of about the same scale as the Great Dyke of Rhodesia.

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