274 ACCOUNT OF THE STRUCTURE 



pected, on finding a vein partly stript of the containing rock ; 

 but as a specimen of this sort had never occurred to me before, 

 I thought it worth mentioning. 



" From this point, following up the course of the stream for 

 about 300 yards, I found the whole a solid mass of granite. 

 The granite is characterised by large crystals of felspar, which, 

 indeed, is true of all the granite which I met with at the 

 Cape. Besides quartz and mica, large masses of hornblend en- 

 ter occasionally into the composition of this rock. 



4t After ascending about 300 yards farther, I came to a line 

 where the granite ceased, and was succeeded by strata of su- 

 perincumbent Sandstone. These strata were horizontal, and 

 without any symptom of disturbance or violence whatsoever. 

 There was not a shift nor a vein; and this junction formed a 

 most marked contrast with that which we had left below. 



" Looking round from the point where I now stood, to all the 

 parts of the amphitheatre, in the centre of which I was placed, 

 I could trace the same line of junction, extending horizontally 

 on every side. 



" From this point, where the sandstone was first discovered, 

 for about 150 or 200 feet perpendicular, the rock continued of 

 the same kind, viz. a red sandstone, in horizontal beds of no 

 oreat thickness. From thence all the way to the summit the 

 sandstone was of a much more indurated kind, quite white, 

 and having pieces of water-worn quartz imbedded in it, from 

 the size of a pea to that of a potatoe. The top is a plane of 

 about ten acres, somewhat uneven, though, on the whole, near- 

 ly level. The weather acting very powerfully in this exposed 

 situation, has worn holes, and laid open the strata in some 

 places to a considerable depth ; and the cement of the sand- 

 stone being softer than the included masses of quartz, these 

 last, when they are exposed at the surface, are always pre- 

 sented 



