Ccqje of Good Hope. 525 



Malniesbury, Paarl, Tulbagh, Ceres, Worcester, Caledon, and Beau- 

 fort West. " 



In the south-west districts Mr. Eogers proves conclusively the un- 

 conformity of the Table Mountain Sandstone on the Malmesbury beds. 

 In the Caledon district he confirms the reading of Mr. Bain that 

 the beds marked as Malmesbury on Dunn's map (1887) are in reality 

 of Bokkeveld (Devonian) age. 



The sedimentary rocks around Beaufort West are all ascribed by 

 Mr. Schwarz to the Karoo beds, and not to the Stormberg, as Dunn 

 formerly supposed. The intrusive dolerites in the Karoo beds of 

 Beaufort West are considered to be similar to the Palisade traps of 

 New Jersey and New York. 



The most important geological results are those that have been 

 obtained during the present survey of the Tulbagh, Worcester, and 

 Prince Albert districts. At Worcester a very large exposure of 

 Ecca beds is described in contact with Malmesbury beds, a fault 

 being suggested by Mr. Schwarz for this unusual relationship. 



This confirmation of older observers of the existence of Karoo beds 

 outside the prescribed limits of the Karoo Basin will be a surprise to 

 many who are wedded to the idea of the simplicity in structure of 

 South African geology. But a complete revolution in the reading 

 of South African stratigraphy will startle no one personally 

 acquainted with its present unsatisfactory state. In the area 

 examined so far, the conformity of the Dwyka conglomerate and 

 Zwartebergen group is agreed upon. This view is in direct opposi- 

 tion to that of the late Professor Green, but accords with the diagram 

 section of the Prince Albert region by Mr. Sawyer.^ 



The theory of the glacial origin of the Dwyka conglomerate 

 receives the support of the Commission, further evidence, in the 

 shape of scratched stones, being brought forward. 



Brief notes on the complicated regions of the Witzenbergen, 

 Schurftenbergen, Hex Eiver Mountains, and Langebergen, are 

 supplied by Mr. Schwarz. The strata, from the Table Mountain 

 Sandstone to the Ecca, are considered as being arranged in three 

 main systems of folds conforming to the S-shaped curve. 



Between the Schurftenbergen and Hex River Mountains the mass 

 of the Zwartebergen beds is described as being thrust southwards, 

 and many complexities of structure are hinted at. Again, near 

 Verkeerde Vley the Zwartebergen group is said to be faulted against 

 Table Mountain Sandstone, while north of the Gydo Mountains, in 

 the Ceres district, the top of the Dwyka is faulted against the base of 

 the Zwartebergen group. 



This description of faulting, folding, and juxtaposition of rocks of 

 various ages betokens a highly complicated region, and it is to be 

 hoped that it will be examined in the greatest possible detail. 



W. Gibson. 



1 Eeport upon the Geology and Mineral Resources of the Division of Prince Albert 

 and surrounding district, by A. R. Sawyer, Capetown, 1893. 



