1865.] ETJBIDGE— SOTTTH AFEICA. 437 



occurs in Swabia. I can already add, founded on the friendly com- 

 munication of MM. Oppel and Schlumberger, that the White Oolite 

 occurs near Nancy under identical conditions, and contains there also 

 A. ParTcinsoni together with the other forms which I have mentioned 

 above. The Nerinsea-bed has also been traced by Oppel and myself 

 as far as the Bernese Jura. The bed No. III. is well developed in the 

 neighbourhood of Basle and Aargau ; it contains a large proportion 

 of the Gasteropods {Pleurotomaria ornata, Sow., P. conoidea, Desh., 

 P. Sauzeana, D'Orb, &c.), which, in the neighbourhood of Bayeux, 

 accompany Ammonites ParTcinsoni, and will hereafter undoubtedly 

 prove of great importance in instituting a special comparison with 

 France. 



The Combrash, containing sixty-four species of fossils, a number 

 which no doubt will be increased, is the same as the English. 



3. On the Changes rendered necessary in the Geological Map of South 

 Aekica b^J recent Discoveries of Fossils. By R. N. Rubidge, M.B. 

 Lond., F'.G.S. 



It may be necessary to remind those not specially interested in the 

 geology of the Cape of Good Hope, that in a paper read to this Society 

 in 1854, on the metallic deposits of Namaqualand*, I pointed out a 

 peculiarity in the relation of the quartzose sandstones with the gneiss 

 of that district — namely, the occurrence of horizontal beds of sand- 

 stone resting on the upturned edges of gneiss, and continuous with 

 inclined sandstone, of Hke kind, interstratified with the gneiss. 



In 1857t I gave reasons for thinking that this relation of the 

 quartzose sandstones existed on a much greater scale in other parts 

 of the Colony, and that it had misled geologists ; that, for instance, 

 the separation of the schists of the Bokkeveldt from the Clay-slate 

 formation was an error of this kind. 



The section published in 1856 in the Society's Transactions :|: I 

 believe, from personal observation, to be nearly correct. The quart- 

 zose sandstones of Table Mountain rest unconformably on the edges 

 of the slates and granites, which are generally believed to be of the 

 same age as the above-mentioned gneiss, as they do at Cape Town 

 and at Bain's IQoof ; but at this place, Mitchell's Pass (or rather in 

 the last range through which the pass winds), the sandstone is found 

 highly inclined, and passing under the Bokkeveldt schists, which 

 rest on it. 



On account of this relation, the schists were supposed to be mucli 

 newer than the clay-slate. Their fossil contents seeming to Mr. 

 Bain to be Upper Silurian, he called the sandstones " Lower Silu- 

 rian," and the rocks of the Cape district " Primary Clay-slate." 



In the paper mentioned I gave some reasons for doubting this 

 conclusion, while admitting the facts from which it was drawn. I 

 thought it probable that the clay-slate and the Bokkeveldt schists 

 belonged to one formation, and that the Carboniferous rocks of the 



* Quart. Joum. Gi'ol. Soc. vol. xii. p. 239. t ihid. vol. xv. )). l'J4. 



J Second Series, vol. vii. pt 4, pi. 21. fig. 1. 



