PRE-CAPE ROCKS OF SOUTH AND WEST OF COLONY 29 



are some remarkable rocks enclosed by the granitic 

 gneiss ; they are sharply defined angular or rounded 

 lumps of various kinds of granulite. The constituent 

 minerals are, quartz, plagioclase felspar, sphene, and 

 magnetite, together with one or more of the following, 

 biotite, colourless angite, garnet, and pale brown horn- 

 blende of an unusual type. These rocks often have a 

 parallel structure, which, however, does not conform to 

 the foliation in the gneiss. These inclusions have some 

 resemblance to certain of the granulites in the Marydale 

 beds of the north, and are to be regarded as metamor- 

 phosed sedimentary or igneous rocks enclosed by the in- 

 trusive granite. At present similar rocks outside the 

 granite are not known in the south of the Colony. 



A few miles east of the southern end of the great 

 mass of granitic rock just described is the irregularly 

 shaped area of granite on which the town of Malmesbury 

 is built. At the south end of this mass is the rugged 

 mountain called Paarde Berg. The granite area is 

 about twenty miles long and six wide, and lies in 'the 

 direction of strike of the Malmesbury beds. The rock 

 is much less varied in this area than in the larger mass 

 to the west, and is mainly a rather coarse biotite-granite 

 with porphyritic orthoclase, but fine-grained granite 

 composed of the same minerals, and coarse pegmatites 

 are not infrequent. There seems to be no gneiss in 

 this area. 



South-east of Paarde Berg is the Paarl Mountain 

 with the well-known group of smooth, naked granite 

 crags on the summit. The most abundant rock in the 

 Paarl Mountain is a biotite-granite. Dykes of quartz- 



