I2 S. fF. EMMONS 
forming the Witwatersberg and Magaliesberg ranges, which are 
supposed to correspond with these on the south side of the 
anticline, though not altogether similar lithologically. If, 
as Molengraaf maintains, the limestones are the Malmani dolo- 
mites, and belong above the conglomerates, the latter must be 
faulted down on the north side of the granite, and not appear at 
alll at the surface. 
Returning again to Johannesburg and following the section 
line southward, there appear, resting on the quartzites and shales 
and apparently conformable with them (Gibson thinks they are 
only separated by a fault, but Molengraaf thinks there is an 
unconformity) a thick series of reddish sandstones with some 
shale, which enclose gold-bearing conglomerate beds of vary- 
- ing thickness, and form a flat, rolling country sloping gently 
south. These dip steeply at the outcrop but shallow in dip to 
the southward, and in a few miles are capped by a body of 
eruptive rocks, called by Hatch, in one place, ‘“‘a hard, fine-grained 
greenstone or melaphyr”’ and in another ‘an overflow of igneous 
rock of basaltic composition, known as the Klipriversberg 
amygdaloid.” Molengraaf speaks of it as an overflow of 
diabase and melaphyr amygdaloid with porphyrite, varying in 
thickness from 400 meters south of Johannesburg to 900 meters 
near Klerksdorp. This forms the hills called the Eagle’s Nest. 
Upon the amygdaloid rests a series of shales, quartzitic sand- 
stones, and gold-bearing conglomerates which he calls the 
Boschrand (wooded mountains), but which are more commonly 
known as the Black reef series, because of a black seam which 
forms its footwall. This series jlolengraaf considers younger 
than the lower sediments and than the igneous rocks, but Gibson 
considers the intrusion of the igneous rocks to have been the 
latest phase. Hatch, to prove that they were deposited uncon- 
formably on the older conglomerates, adduces the facts (1) that 
they are nearly flat (10° against 45° to 80° dip of the lower 
beds), (2) that followed eastward they overlap the older series, 
(3) that they occasionally contain rolled fragments of the older 
conglomerates. The total thickness of this southerly dipping 
