Excerpt from The South African Mining Journal, Vol. 25: With Which Is Incorporated "the South African Mines, Commerce and Industries"; Part II; March 25, 1916
A paper of considerable interest, which had been prepared by Dr. A. L. Du 'l'oit, of the Geological Southern Kalahari Survey of the Union, for presentation to Karroo System. The Geological Society of South Africa, was read at the last meeting of the Society on Monday evening. It dealt at some length with a good deal of evidence, largely collected from boreholes, relating to the extension of the Karroo System under the sandy 'wastes of the Southern Kalahari. The sribject has been treated in detail by Dr. P. A. Wagner in his memoir upon the geology and mineral industry of south-west Africa, and the paper referred to, besides adding confirmation to much that has been stated in the memoir, records the results of observa tions over a wider field. It is shown that in south-west Africa, no less than in the Congo region, in, Swaziland, Rho desia and other territories where the Karroo System has been investigated, there is a special phase which may be said to be characteristic. As has already been remarked, Dr. Du Toit has collected information as far as possible from boreholes which were put down by the Government in connection with the campaign against the German forces. Owing to the fact that these boreholes were sunk by means of percussion drills, it was difficult to interpret the evidence with completeness. Enough data have been obtained, how ever, to prove the extention eastwards into the Kalahari of a vast area of Karroo beds. Later on the importance of the Karroo beds as a source of water supply will doubtless lead to further investigations under Government auspices. It is interesting to learn, by the way, that the white band of the Southern Karroo finds its equivalent in the white zone of the Keetmanshoop district, and that the volcanic beds of the Gibcon, Rehahoth and Gobabis districts are of similar type and apparently of the same age with those of the Drakensbcrg. These two points in Dr. Du Toit's paper are of some importance in themselves, and as confirming the view of Dr. Wagner.
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