238 Transactions of the South African Philosophical Society. 
Rheebok’s Valley, at the summit of the Pass, and on the eastern 
side of the summit. | 
About two hundred yards above Rheebok’s Valley house the 
conglomerate is seen in the ditch by the roadside, and also in 
shallow pits from which road-mending material is dug. The rock is 
a greenish-brown, sandy, unbedded mud-stone, with abundant well- 
rounded grains of quartz and a little felspar; pebbles up to five 
inches in length are contained init. The pebbles are not arranged 
in layers, but are scattered through the rock at intervals of several 
inches or feet, and as the exposures are rather small only a few 
pebbles of the largest size were found. Since the amount of material 
removed to make the shelf for the road is not very great, and at the 
same time consists mostly of surface soil and fallen débris, only a 
small portion of the underlying conglomerate has been disturbed, so 
that there are no artificial débris heaps from which specimens of the 
pebbles can be collected. All the specimens obtained were picked 
out from the rock 7m situ, and some of these were only discovered on 
breaking down large lumps of the mud-stone. 
Between Rheebok’s Vlei and the top of the Pass there are no 
more good exposures, but the conglomerate is seen in the ditch by 
the roadside. Beyond the highest point there are numerous but 
small excavations along the road, forming a nearly continuous 
section perhaps two miles long. The bulk of the rock is an un- 
bedded mud-stone with scattered pebbles, similar to that in 
Rheebok’s Vlei; but two important varieties occur, in one of 
which an approach is made to the usual type of the Table Mountain 
Sandstone by the great increase of the proportion of quartz grains, 
and the other furnishes a transition series between the conglomerate 
and a shale, such as is seen by the roadside north of Pakhuis and in 
Bailie’s Gat. The shaly variety of the conglomerate is seen about 
half a mile from the top of the road. In composition and colour it 
is similar to the unbedded rock, from which it differs by the presence 
of planes of lamination. Parts of this rock contain fewer grains 
of quartz than others, and thus assume the character of shale, 
and become red and yellow when weathered. The dip of the 
eritty shale is about 10° towards N., 35° H., agreeing with that 
of the quartzite outcrops below the road, and with that of the 
quartzites in the mountains above. It is only in the shaly portion 
of the conglomerate that dip can be observed, for in the other 
sections, none of which is more than 10 feet high, the conglomerate 
shows no sign of bedding. 
The pebbles found in the conglomerate are of quartz, quartzite, — 
dark hard grits, felsites, and granite. Many of them, especially the 
