706 MK. E. H. EASTALL ON THE GEOLOGY OP [Nov. I9II, 



excavations, very good unweathered specimens can here be obtained. 

 This conglomerate forms a low rounded hill, to the north of which 

 is a level expanse of loam and brick-earth, about half a mile wide. 

 In this loam are a good many gullies (sluits) formed by streams 

 during heavy rains, and, at the bottom of some of these, exposures 

 of Ecca Sandstone can be seen. At the foot of the next slope is 

 an outcrop of a peculiar shattered quartzose rock, which is believed 

 to indicate the position of the great fault. 



Immediately to the north of this are several small quarries 

 in which a variety of rock-types are to be seen, including a band 

 of white crystalline marble associated with highly -crushed granitic 

 dykes. This marble probably represents a band of limestone, 

 which has been metamorphosed by the granitic intrusions, as well 

 as crushed by earth-movements, and it is associated with some 

 greasy-looking schistose rocks of remarkable character. For some 

 distance north of this there are numerous bands of a hard rock, 

 which is called by Dr. Rogers ' phyllite-gneiss.' As we shall see 

 presently, these are undoubtedly igneous intrusions that have 

 undergone foliation by earth-movement. 



For some 3 miles northwards the ground is occupied by a 

 monotonous series of silvery, greenish or grey, fine-grained, schistose 

 rocks, which may be called slate, phyllite, or schist ; here and 

 there only are to be seen thin bands of grit or quartzite, which 

 seem to be usually quite impersistent, and of little importance. A 

 somewhat thicker band of grey quartzite occurs near a sheepfold, 

 on a kopje about 3 miles north of the railway-station. The 

 phyllite or slate weathers into soft, brownish-grey, sandy flags, 

 which cover a great stretch of country : exposures are frequent, 

 but of little interest. 



Following the cart-track from this point over the low watershed 

 to the first tributary of the Hartebeest River, we note that 

 exposures become scarce, and a great spread of gravel and sand is 

 encountered, which continues for some distance. The deficiencies 

 of this part of the section must be filled in from parallel traverses, 

 made both to the east and to the west of this line. 



When next exposed, higher up the Hartebeest River, the 

 M lmesbury rocks are represented by massive green and purple 

 grits of a kind not before seen : the unusual colours are probably 

 due to the fact that the specimens here obtained are unweathered, 

 coming from the excavations for the pipe-line of the waterworks. 

 They appear to be similar in all essential characters to the grey and 

 brownish grits of the Hex-River Pass, on the east. These grits 

 can be seen to disappear under the Table Mountain Sandstone; 

 the latter has a fairly steep dip to the north, and here forms an 

 escarpment some 4000 feet high, cut up into prominent peaks and 

 ridges. Where last seen, the Malmesbury Grits also exhibit a 

 strong dip to the north, at a much steeper angle than the Table 

 Mountain Sandstone. 



Throughout the whole of the distance from the Worcester Fault 



