332 Reports and Proceedings — 



were noticed in it. A definite list of the strata of this conglomerate, 

 where it is 138 feet thick in Zululand, is given ; and the author 

 does not regard it as of glacial origin. No 9 is treated of in the 

 next paper. 



3. " On the Occurrence of Dolomite in South Africa." By D. 

 Draper, Esq., F.G.S. 



A peculiar calcareo-siliceous rock, near Lydenburg, described by 

 Messrs. Penning and Crutwell as " Chalcedolite," and a similar 

 rock mentioned by Mr. Penning, F.G.S., as overlying the " Black 

 reef Series " of the Megaliesberg formation, are recognised as dolo- 

 mite. Mr. C. Alford, F.G.S., has described a "calcareous quartzite," 

 as passing into dolomite and ultimately into chert, and known 

 as the " Elephant rock " in Transvaal, sometimes cavernous with 

 underground waters. From his own experience Mr. Draper has 

 recognised the " Elephant rock " in the Potschefstroom, Lichtenburg, 

 Malmani, and Lydenburg districts as a real dolomite, with inter- 

 stratified siliceous bands, weathering into a brown earth like man- 

 ganese oxide, and superficial siliceous debris. It has its place 

 between the Table-mountain Sandstone and the quartzite of the 

 Gats Rand ( = Zuurberg quartzite of the Cape). It has auriferous 

 veins in Malmani and Lydenburg. Dr. Schrenck has noticed a 

 similar dark blue dolomitic limestone in Great Namaqualand. The 

 deep water holes in it in Malmani are comparable with those found 

 by F. Galton in West Central Africa. The great caves in Mashona- 

 land may belong to it. The extensive tufaceous deposits in Griqua- 

 land-West, the Transvaal, and Orange Free State were probably 

 derived from this extensive dolomite. 



4. "Contributions to the Geology of British Bast Africa." By 

 J. W. Gregory, D.Sc, F.G.S. 



The author describes moraines, striae, glacial lake-basins, perched 

 blocks, and roches moutonnees below the present limits of the glaciers 

 of Mount Kenya, which he maintains to indicate the existence of a 

 " calotte " or ice-cap extending at least 5,400 feet farther down the 

 mountain than the termination of the present glaciers, and possibly 

 farther, for in the belt of forest detailed observations could not be 

 made. 



He agrees that this more extensive glaciation was produced by a 

 greater elevation of Mount Kenya, and that any theory of universal 

 glaciation is unnecessary, and indeed opposed by many facts in 

 African geology. 



He discusses the probable influence of this former glaciation on 

 the meteorological conditions of the surrounding area and the dis- 

 tribution of its flora and fauna. 



II.— June 6th, 1894.— Dr. Henry Woodward, F.E.S., President, 

 in the Chair. The following communications were read : — 



1. " On the Banded Structure of some Tertiary Gabbros in the 

 Isle of Skye." By Sir Archibald Geikie, LL.D., D.Sc, F.K.S., 

 F.G.S., and J. J. H. Teall, Esq., M.A., F.R.S., Sec.G.S. 



After calling attention to the previous references to the pseudo- 



