Vol. 67.] WORCESTER, ROBERTSON, AND ASHTON (CATE COLONY). 725 



A careful examination was also made of a well, sunk by 

 Mr. J. O'Connor about half a mile west of Ashton Station, by the 

 side of the main road to Robertson. The following section was 

 compiled from personal inspection, and from data supplied by 

 Mr. O'Connor: — 



Thickness in feet. 



Soil, clay, etc 30 



Hard marly chiy 25 



Boulder-bed 5 



Enon Conglomerate 60 



The recent deposits of soil and clay are here of extraordinary 

 depth, no less than 60 feet being passed through. The lowest 5 feet 

 of this consists of a bed of big boulders, chiefly of Table Mountain 

 Sandstone, well rounded by water-action. A very large pile of 

 pebbles from the Enon Conglomerate was carefully examined. 

 They range up to 18 inches in diameter, and the largest came 

 from the bottom of the well. Abundant specimens of Dwyka Con- 

 glomerate were observed, while the blocks of sandstone closely 

 resemble the grit -bands in the Witteberg Series, and are quite 

 unlike the Table Mountain Sandstone. It is an observation of the 

 utmost significance that the Enon Conglomerate of this neighbour- 

 hood contains no fragments of Malmesbury rocks, and this statement 

 is fully confirmed by Mr. O'Connor, who has an intimate know- 

 ledge of all the rocks of this neighbourhood. There is also some 

 evidence that boulders of Dwyka rocks are more abundant below, 

 and those of Witteberg rocks above. 



XL General Conclusions. 



The dominant tectonic feature of Cape Colony is the occurrence 

 of conspicuous lines of folding, which are very clearly indicated by 

 the outcrop of the rocks of the Cape System. Over an immense 

 area in the centre and north of the Colony the rocks of the Karroo 

 System are horizontal ; but, towards the south and west, they begin 

 to show increasingly steep dips, and at the margin of the outcrop 

 they are very highly inclined along with the Cape rocks. In the 

 south the two systems are apparently conformable, but towards the 

 north there is a conspicuous overlap of the Karroo System. The 

 markedly rectangular form of the south-western corner of the 

 Karroo outcrop is intimately connected with the direction of the 

 principal lines of folding. These are divided into two well-defined 

 sets : near the west coast the trend-lines run north and south, 

 while near the south coast they run east and west. These are 

 called by Dr. Rogers the Cederbergen and Zwartebergen Series 

 respectively. 



These two sets of folds come together in the neighbourhood of 

 Worcester and Robertson, and it is necessary to consider the nature 

 of their junction or syntaxis. The matter is further complicated 

 by the occurrence of the great Worcester-Swellendam Eault, which 

 cuts obliquely across the syntaxis, and has brought down a small 

 area of Karroo rocks on its southern, or downthrow side. It is 



