PRE-CAPE ROCKS OF SOUTH AND WEST OF COLONY 27 



younger than the Cape formation, points to the repeti- 

 tion of the folding along the same lines at a great 

 interval of time. 



2. THE GRANITE INTRUSIONS. 



The Malmesbury beds have been invaded by masses 

 of acid igneous rocks, granite and gneiss principally, and 

 have been metamorphosed by them. The intrusions 

 are elongated in outline and lie with their longer axes 

 parallel to the strike of the invaded sediments : they 

 form the highest ground in the Pre-Cape area with the 

 exception of the outliers of Table Mountain sandstone. 



The largest granite area is that which stretches from 

 St. Helena Bay south-south-east to Klein Dassen Berg, 

 a distance of seventy miles, and the highest points 

 reached by the granite are Kapoc Berg and Contre Berg, 

 both over 1,500 feet above the sea ; on the lower ground 

 the rock is usually concealed by blown sand, limestone 

 or lateritic ironstone. 



Saldanha Bay is a deep inlet in this mass of granite. 

 On the western edge of the granite, along the shore near 

 Paternoster, Danger, and Saldanha Bays, large inclu- 

 sions of slate are frequently seen in the igneous rock, 

 indicating the proximity of the Malmesbury beds ; the 

 edge of the intrusion is probably not far to the west of 

 the present coast line. 



Many varieties of granitic rock are found in this great 

 area. The most abundant perhaps is a two mica (i.e., 

 with both black and white mica) granite with orthoclase 

 as the chief felspar. Tourmaline is often present in the 

 rock near Darling. Every gradation between a normal 



