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PKOCEEDHirGS OF THE GEOLOGICAL SOCIETT. [NoV. 17, 



on this point. The inclined beds of this district are gneissic, and, 

 in the instances referred to, very quartzose. 



The horizontal sandstones of this district he correlates with the 

 Table Mountain sandstones * ; he has found in them a few obscure 

 traces of fucoidal or other plants f- 



The author then passes on to the Cape district ; and, first offering 

 his testimony to the industry and general exactitude of Mr. Bain as 

 a geologist, he proceeds to compare Mr. Bain's section of Mitchell's 

 Pass:|: with a section which he lately made for himself on two hasty 

 journeys. 



Mr. Bain figures the iadurated sandstone or quartzite of Mit- 

 chell's Pass as being at first horizontal, and then suddenly dipping 

 at a strong angle northward, so as to underlie the Devonian schists 

 of the Bokkeveld, at Ceres, and to divide them from the slates of 

 the Cape district. Dr. Eubidge points out the apparent difficulty of 

 explaining such an inclination of the quartzite, the slates under- 

 lying both the inclined and horizontal portions not presenting any 

 evidence of a difference in dip ; and he suggests that the inclined 

 beds of quartzite have nothing to do with the horizontal quartzite, 

 except that, being immediately beneath the horizontal siliceous beds, 

 they have by some means been silicified from above, and thus ren- 

 dered in appearance identical. 



" On referring," says the author, "to Mr.Bain's section Xo.l,pl.21, 

 we see that the Table Mountain Sandstone rests in a horizontal 

 position on the granite and inclined slates. Tracing the section 

 westward, we find several alterations of dip in the slate, but no evi- 

 dence that the more ancient rocks have undergone more than one 

 series of displacements, viz. that which raised the slates of Table 

 Mountain and the Lion's Head to their present position, so that they 

 appear to have remained undisturbed since the deposit of the hori- 

 zontal rocks. At Bain's Kloof, and at the eastern end of Mitchell's 

 Pass, we find the superjacent quartzite-beds or sandstone still hori- 

 zontal, — the whole mass being so at its upper part, while its lower 

 beds are highly inclined at an angle conformable with the slates on the 

 one side and the fossiliferous schists of Ceres on the other. (See fig.) 



Section at the Village of Ceres. 



Mitchell's 

 Pass. Bokkeveld Mountain. 



2. Quartzite or sandstone. 1 c. Devonian schists of the Bokkeveld. 



1 b. Quartzose or silicified portion of the schists. 1 a. Devonian schists or slates. 



* Quart. Journ. Geol. Soc. vol. xii. p. 238 ; and ibid. vol. xiii. p. 235. 



t Loc. cit p. 239. 



X Geol. Trans. 2 ser. vol. vii. pi. 21. fig. 1. 



