PRE-CAPE ROCKS OF THE NORTH OF THE COLONY 7 1 



directly on the rhyolites of the lower group in the north 

 and middle parts of the hills, but at the south end they 

 overlap the Zoetlief beds and lie on the granite. 



The Kuip lavas are greenish-blue rocks, usually 



lygdaloidal, and just like the more basic lavas of the 

 'niel series ; there is little or no volcanic breccia. 



The sedimentary rocks are principally arkoses ; they 

 tre conglomeratic in places and contain pebbles, some 

 >f which have been derived from the Zoetlief lavas ; 

 there are also layers of flagstones, limestones and 

 cherts. Two small patches of this formation occur on 

 Maritz Dam. 



The Kuip series has not been recognised elsewhere in 

 the Colony. 



C. THE PNIEL SERIES. l 



These beds which cover a wide area east of the 

 Langebergen in the north of the Colony, consist mainly 

 of blue-green diabasic lavas and sedimentary rocks, often 

 with much greenish debris in them. The series varies 

 greatly in thickness, but, where best developed, the 

 lower portion consists of sedimentary rocks and the 

 upper chiefly of lavas. 



The sedimentary rocks comprise conglomerates, 

 arkoses, quartzites, flagstones, and (around Beer Vlei) 

 limestones and chert. They were evidently deposited 

 upon an uneven floor, and their variation in thickness 

 is partly due to this circumstance. The conglomerates 



1 Stow, Q. J. G. S., xxx. ; G. C., x., pp. 149, 249, (Diabase formation) ; 

 xi., pp. 15-97 ; xii., pp. 51, 170 ; xiii. ; Rastall, Rep. S. A. A. A. S. for 1905 

 and 1906, p. 272. 



