The Quarterly journal of the Geological Society of London . hey•again disappear under the Karoo Formation. Although much com-plicated by faulting on these farms (see tig. 1, p. 82), the different seriesof conglomerates (Main, Bird, and Kimberley) can be recognized,both by stratigraphical position and petrological character. Turningnow to the western section of the Rand, we find on the farm Wit-portje, near Roodepoort, 13 miles west of Johannesburg, the MainReef Series thrown north a distance of 3 miles by a great fault,known as the Witportje break. The beds resume their normal ^ Gribson, Quart
The Quarterly journal of the Geological Society of London . hey•again disappear under the Karoo Formation. Although much com-plicated by faulting on these farms (see tig. 1, p. 82), the different seriesof conglomerates (Main, Bird, and Kimberley) can be recognized,both by stratigraphical position and petrological character. Turningnow to the western section of the Rand, we find on the farm Wit-portje, near Roodepoort, 13 miles west of Johannesburg, the MainReef Series thrown north a distance of 3 miles by a great fault,known as the Witportje break. The beds resume their normal ^ Gribson, Quart. Journ. Greol. Soe. vol. xlviii (1892) p. 409; Schmeisser,* Ueber Vorkomraen u. Grewinnung der nutzbaren Mineralien in der Berlin, 1894; Hatch & Chalmers, The Gold Mines of the Eand,London, 1895, pp. 22-87; Karl Futterer, Afrika in seiner Bedeutung fiirdie Groldproduktion, Berlin, 1895; De Launay, Les Mines dOr du TransvaalParis, 1896; also Trans. Fed. Inst. Min. Eng. vol. xi (1896) p. 378. Q. J. G. S. No. 213. G CJ 5; • i-i. 4i O TO eO ~ Vol. 54.] GEOLOGY OF THE WITWATERSRAND, ETC. course, namely, east, on the properties of the French Rand andChamps dOr Gold Mining Companies. On these properties theMain Eeef Series is known as the Bothas Series, while theKimberley Series is called the Battery Reef Series. Traced stillfarther, the beds swerve to the south through Randfontein andUitvaalfontein, until again cut off by an east-and-west fault, whichcarries them on to the farms Droogeheuvel, whence they may befollowed south-west through Haartebeestfontein and Witfontein. Examined in detail in the mine-workings, the beds are found tohave suffered numerous minor dislocations by cross-courses, thefaulting being in many cases accompanied by igneous intrusion (asin fig. 2). Several instances of overthrust and reduplication by Fig. 2.— Upthrow fault in tJte Crown Reef Mine.
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