Slow — SOtTTH-AFRICAN GEOLOGY. 



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Paet I. § 2. Tertiary or Posttertiary Strata, 

 [Abridged*.] 



1. Pliocene or Postpliocene Strata 

 of the Interior. — Having thus no- 

 ticed the older rocks, I will now 

 proceed to make a few remarks 

 on the so-called " Tertiary Lime- 

 stone "f, which covers in many 

 places the rocks we have been 

 describing. This series caps the top 

 of the Zwartkops GHffs, extend- 

 ing from E-ocke's Bluff (see Sec- 

 tion R, fig^ 7), along the top of the 

 hills towards Uitenhage, and rest- 

 ing upon the Jurassic sandstones. 

 The greatest accumulation appears 

 to be on the Amsterdam Flats and 

 the Grassridge. At the Koega it 

 is found upon the friable non- 

 fossihferous sandstones of that 

 locality (see above, p. 506). At 

 the Sundays River it is seen on 

 McLoughlin's Bluff as a narrow 

 belt. These positions are shown 

 in Sections E and E, (see fig. 7). 

 From the Zwartkops to the quart- 

 zite ridges of Port Elizabeth, I 

 am not aware that any traces of 

 it have been found. Mr, Pinchin, 

 who has paid much attention to 

 this formation, states (in a letter) 

 that " it covers the upper part 

 of the plain (Amsterdam Flats), 

 extending westward to Hitzeroth's 

 (the Old Government) Saltpan, 

 and along the tops of the hills to 

 within a mile of Uitenhage ; it 

 covers the whole of the Grassridge 



* The sections and sketches sent by 

 the Author for this portion of his Me- 

 moir are deposited with the others in 

 the Society's Archives ; and the large 

 collection of recent and fossil shells &e. 

 sent by Mr. Stow, in illustration of his 

 views as given in this paper, awaits ex- 

 amination by Mr. W. S. Dallas, who 

 kindly promises a full report. — T. R. J. 



t This is the limestone termed " Ter- 

 tiary " in Mr. Bain's Geological Map 

 of the Cape Colony, Geol. Trans. 2 ser. 

 vol. vii.pl. 20.— T.E. J. 



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