4 Transactions of the South African Philosophical Society. 



ness of the shale band in this neighbourhood is three hundred feet, 

 of which the lowest hundred feet are of reddish-yellow weather- 

 ing conglomerate. In the two kloofs cut along this horizon, which 

 lead north to the Jan Dissel's river and south to the Keurbosch Kraal 

 river respectively, there are many very good exposures of all parts of 

 the conglomeratic rock, including the passage beds into the under- 

 lying sandstones on the one hand and the overlying shales on the 

 other. The coarse sandstone below becomes more and more argil- 

 laceous towards its upper limit, and the included pebbles increase in 

 numbers and variety, till within a vertical distance of twenty feet 

 from the normal type of sandstone the rock assumes the character 

 of the Pakhuis conglomerate. The passage upwards into the shales 

 without pebbles comes about by the gradual decrease in numbers of 

 the pebbles and the greater frequency of lamination planes in the 

 sandy mudstone towards the top of the conglomerate. Pebbles of 

 quartz, quartzites of three kinds, sandstones, felspathic grits, diabase, 

 amygdaloidal rocks of the Zeekoe Baard type, and granite were 

 noticed in these exposures, and several of them are flattened on one 

 or more sides, and well striated. A dozen pebbles, from two to five 

 inches in length, showing characteristic glacial striations, were found 

 in this locality during the three hours I spent on the five miles of 

 country between the two rivers mentioned above. Some very good 

 exposures of the conglomerate, thirty feet in height and many yards 

 long, can be seen on the banks of the stream entering the Keurbosch 

 Kraal river. The pebbles are scattered quite irregularly through the 

 sandy mudstone, which has a purplish colour ; they are hardly 

 abundant enough to give the rock the appearance of a conglomerate 

 on a casual inspection, and areas of many square feet show no 

 pebbles. 



In the former communication on this subject it was pointed out 

 that though the evidence given therein was sufficient to justify the 

 belief that the glacial conglomerate really belonged to the Table 

 Mountain series, and was not an outlier of the Dwyka conglomerate 

 to which it had some resemblance, further facts to prove its strati- 

 graphical position were desirable. These later observations place 

 the conclusion then arrived at beyond dispute. In each of the 

 localities described above the position of the conglomerate is the 

 same, viz., at the base of the shale band, and in each place, so far 

 as one can judge from the not very satisfactory sections, the con- 

 glomerate forms about a third of the thickness of the shale band. 

 The gradual passage from the lower sandstones into the conglomerate 

 on Bosch Kloof is clear evidence as to the relationship of the two 

 rocks, and the passage upwards into the shale without pebbles has 





