242 Transactions of the South African Philosophical Society. 
in a fine-grained matrix. The Dwyka found in the Karroo, some 
twenty-five miles east of Pakhuis, is blue in colour, harder than the 
Pakhuis rock, and contains a much greater variety of rocks in the 
form of boulders or pebbles. The chief classes of rocks which are 
present in the Dwyka and absent from the Pakhuis conglomerate are 
the amygdaloidal and other diabases, and amygdaloidal rocks of more 
acid composition. ‘The small rounded quartz pebbles, mentioned 
above as being so abundant in the Pakhuis conglomerate and Table 
Mountain Sandstone, are not found in the Dwyka. There is, 
however, no essential distinction at present known between. the 
lithological characters of the two conglomerates; therefore the 
determination of the stratigraphical position of the Pakhuis con- 
glomerate is of great importance. The description of the occurrence 
of the conglomerate given above, together with the position of the 
outcrop laid down in the accompanying map and section, contains 
all that can be said on this point at present. The parallelism of the 
conglomerate outcrop with those of the sandstones above and below, 
and the agreement in dip, where dip can be observed in the con- 
glomerate, lead to the conclusion that the conglomerate is actually 
interbedded with the sandstone, but a clear section showing the 
conglomerate overlain by the shale and sandstone will be very 
welcome. 
I have been over a considerable part of the country between 
the Karroo and the Olifants River valley both north and south of 
Pakhuis, but no outlier of the Dwyka conglomerate has been found 
there; and as on the east side of that country the Bokkeveld and 
Witteberg Beds, or the former alone, lie between the Table Mountain 
Sandstone and the Dwyka, one would not expect the Dwyka to lie 
directly upon the Table Mountain Sandstone in the Cederbergen. 
