440 Geological Society. 



The De Kaap- Valley Beds consist of schists, shales, cherts, and 

 quartzites, with some conglomerates, chloritic, and steatitic beds of 

 great thickness, faulted, according to the author, against the 

 granite. They contain a few obscure corals, and are provisionally 

 referred to the Silurian. 



The Witwatersrand Series consists chiefly of sandstones, shales, 

 cherts, and quartzites, having an estimated thickness of 18,000 feet, 

 possibly formed in a hollow of the granite, and perhaps of marine 

 formation. 



The Klip-Biver Series is formed of shales, flagstones, cherts, and 

 quartzites, with numerous interstratified traps, and is at least 

 18,000 feet thick. Near its base is the " Black Reef" and a chal- 

 cedonite like that described by the author in connexion with the 

 Lydenberg district, which confirms his opinion that this area 

 is formed of part of the Megaliesberg formation. The base of the 

 series is generally conformable to the underlying rocks. The 

 whole of the lower half of the Megaliesberg formation is let down 

 against the north side of the granite S. of Pretoria. 



The author divides the formation which he described in 1884 

 under the heading of High-Level Coalfields of South Africa into the 

 Kimberley Beds and the High Veldt Beds. The former thin out 

 eastward, and are overlapped by the latter, the estimated thickness 

 of which is 2300 feet. A volcanic rock overlies the Coal-formation. 

 Near the base of the formation is a bed of loose, calcareous, sandy 

 clay enclosing many waterworn pebbles, some of large size, derived 

 from the quartzites and "Bankets" of the underlying formation. 

 The author is convinced that the region was under glacial influences 

 at some time during the long period which intervened between the 

 deposition of the Megaliesberg formation and of the coal-bearing 

 rocks of the High Yeldt, which latter, he maintains, are certainly 

 Oolitic : the latter contain Glossopteris (?) and fishes, which he con- 

 siders to be nearly allied to Lepidotus valdensis, the latter being 

 from the Free State. 



The High- Veldt rocks are of fluviatile origin, and there appears 

 to have been continuity of fluviatile denudation from the close of 

 the Oolitic period until now. 



2. " On the Lower Limit of the Cambrian Series in N.W. Caer- 

 narvonshire." By Miss Catherine A. Raisin, B.Sc. 



In this paper the author examines the questions, whether the 

 Bangor beds should be included in the Cambrian Series, and how the 

 strata associated with the southern felstone should be classed. The 

 lithological character of the rocks overlying the conglomerate at 

 Bangor is shown to be of little classificatory value, but the apparent 

 discordance between its strike and that of the beds beneath suggests 

 the inclusion of the latter in the Pre-cambrian series, as maintained 

 by Prof. Hughes and Prof. Bonney. 



The age of the northern beds must depend, however, to a great 

 extent upon the classification adopted for the Llyn Padarn rocks. 



