102 GEOLOGY OF CAPE COLONY 



The Upper Griqua Town Beds. 1 



In the north-west part of Hay and the south-west of 

 Kuruman there are sedimentary rocks lying above the 

 Ongeluk lavas, and, as far as known, they follow the 

 latter conformably. They are about 2,500 feet thick 

 and are unconformably overlain by the Matsap beds 

 of the Langberg. They consist of slaty rocks, 

 phyllites, some quartzites, blue limestone, and red, 

 black and brown magnetic cherts or jaspers, very like 

 the thicker bedded jaspers of the Lower Griqua Town 

 beds. They are to a large extent concealed by sand, 

 which covers them entirely north of the farm Alister in 

 Kuruman. 



1 escribed in G. C., xi., 48-49. 



