30 THE GRANITE INTRUSIONS 



porphyry in continuity with the main mass of granite 

 traverse the surrounding slates along their strike. No 

 gneiss has been observed in this mass. 



On the east side of the Berg River between Welling- 

 ton and Paarl is a long, narrow area of granite overlain 

 by the sandstones (Table Mountain series) of the Klein 

 Drakensteins. This mass extends eastwards down Du 

 Toit's Kloof. Both this granite and the Paarl Mountain 

 rock have a more northerly direction than the other 

 intrusions, and a corresponding change of strike is 

 noticed in the Malmesbury beds of the neighbourhood. 



South of the Paarl granite area, in the French Hoek 

 valley, there are several inliers of granite and quartz- 

 porphyry. One variety of the latter is a striking rock 

 having large twinned salmon-pink orthoclase crystals 

 set in a grey-blue fine-grained stony ground mass. The 

 somewhat irregularly shaped mass of Pniel and Stellen- 

 bosch is nearly connected to that of French Hoek on 

 the east and to that of Bottelary and Helderberg to the 

 west. Gneiss enters largely into the constitution of 

 these bodies of granitic rock, and, as in the case of the 

 great intrusion on the Saldanha Bay coast, there is no 

 evidence here that the intrusion of the foliated rock 

 was of later or earlier date than the massive granite. 

 In places, such as certain parts of the mountain slopes 

 on the left bank of the Jonker's Hoek stream, the gneiss 

 has been crushed along planes parallel with the direction 

 of the dominant structural lines in the neighbourhood, 

 the cleavage and strike of the slates, and the foliation 

 planes of the gneiss ; the crushing occasionally resulted 

 in the production of a rock more like a gritty schist than 



