Transactions of the Geological Society of South Africa Volume 7-8 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...Franspoort--that is to say, to the angle of bend in the Magaliesberg Quartzite. We shall now describe a traverse from a point about a mile south of Irene Station to the east (see Plate III., Section No. 2). For the first few miles the arrangement of the formations agVees, with the sequence observed during the traverse first described, Dolomite is followed by shales, then Timeball Quartzite, then more shales, succeeded by a fairly thick diabase, but after this point we do not meet with a second Timeball Range, but with a strip of Daspoort Quartzite, dipping conformably with the underlying beds to the north-east. In view of this unusual arrangement, a considerable time was spent in accurately following up this band; no trace of a Magnetite-quartzite could be found, and moreover, the quartzite is not of that reddish colour, nor does it show the peculiar trough-like forms of weathering, which characterise Timeball Quartzite. It consists indeed of a white massive formation, showing no intercalated shales, and forming a conspicuous kopje overlooking the valley of the Hennops River. Continuing the traverse to the east, one finds this Daspoort Quartzite passing with a well-marked dip of 18 below the Dolomite, with practically no shales between. From this point, Dolomite continues along the surface, but there is reason to believe that this formation is not of any considerable thickness, for on the right side of Hennops River, and close to where a small tributary joins it, a cutting was made a few months ago for water. At a depth of some forty feet, shales were seen to underlie the Dolomite, and from the junction a powerful spring issued. After reaching the right side of Hennops River, the arrangement of the formation is similar to that further...