82 E. H.-L. SCHWARZ 
Aughrabies Falls, a little under 2,000 feet above sea-level, and the 
“kopje veld” of the country south of the main watershed is replaced 
by wide open flats and the gorges of the rivers by winding, shallow 
streams of low gradient. Here all the sills dip southward till the 
old shore line of the Karroo Lake is reached and the older basement 
BARE RIB OF DOLERITE 
EDIMENTARY BEDS 
DOLERITE 
Fic. 7.—Western end of Quizzyhota laccolite, showing dolerite passing into the 
Karroo rocks of the Krantzes. : 
of the Karroo makes its appearance. Besides the main watershed 
there is another topographical feature to be observed: it is the 
main escarpment of the Karroo sediments and the dolerite sills 
which coincide with the main watershed in the west, but diverge 
from it east of Compass Berg. The escarpment begins on the east 
