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Keywords: South African Geology - Schwarz - 1912 Fig 12.png en Figure from South African Geology - Schwarz - 1912 Page 74 Fig 12 ” Snuff box Shale upper Dwyka shales; weathering from within The cementing material of the rock becomes concentrated along the joints leaving the interior of the blocks white and pulverulent 1912 File South African Geology - Schwarz - 1912 djvu Schwarz Ernest Hubert Lewis 1873-1928 other versions PD-old-70-1923 South African geology book |