Abstract
MEMOIR No. 6 of the Geological Survey of South Africa, by A. L. Hall, on “The Geology of the Murchison Range and District,” deals with picturesque features of the Drakensberg scarp. Plate xv. finely illustrates the youthful nature of the Groot Letaba River (Fig. i), which is represented (p. 29) as having cut back into the mature drainage-system of the M'Thlapitsi. The banded ironstones near Thabina (p. 66), associated with metamorphosed sediments, are regarded as also of sedimentary origin, although they are now composed of magnetite. We believe that this view must be generally accepted, and it has an obvious bearing on theories of the origin of the sheet-like magnetite ores of Sweden. Pp. 124 to 130 contain an interesting account of the formation of hybrid rocks between syenite, pyroxenite, and limestone. The limestone now contains olivine, magnetite, and apatite. The Olifants River micafields come within the scope of this memoir (p. 153). We notice (p. 19) that “neck” is used, perhaps unwisely, in its English form for a notch produced by weathering.
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Geology in British Africa . Nature 94, 152–153 (1914). https://doi.org/10.1038/094152a0
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DOI: https://doi.org/10.1038/094152a0