- On D rift-gravels at West Wickham. 157 



Free State and Cape Colony, and recently by Dr. Molengraaff from 

 the Transvaal. Other observers however, and especially the late 

 Prof. Green, had disputed the glacial origin of the Dwyka beds. 

 The photographs now exhibited would, the speaker thought, convince 

 most geologists that the phenomena presented were due to ice-action. 

 The resemblance to similar photographs shown to the Society in 

 1896 by Prof. T. W. Edgeworth David, and representing the beds 

 corresponding to the Dwyka Conglomerate in South Australia, was 

 noteworthy. Evidence of glacial action in Upper Palaeozoic times 

 had gradually accumulated from India, Australia, and South Africa, 

 and there was a probability that similar indications existed in South 

 America. 



The following communications were read: — • 



1. 'On the Geologv and Eossil Corals and Echinids of Somali- 

 land.' By Dr. J. W." Gregory, F.G.S. 



British Somaliland consists of a high plateau, of which the 

 northern scarp is separated from the Gulf of Aden by a belt of low 

 hills and plains known as the Guban. The southern plateau 

 consists of Archaean gneisses, quartzites, amphibolite- schists, 

 chloritic schists, and pegmatites. It is capped by purple grits, 

 red sandstones, and conglomerates, which are covered by limestones 

 of Keocomian, Turonian (? Cenomanian), and Eocene ages. The 

 Neocomian limestone, which may be correlated with that of Singeli 

 described by Rochebrune, occurs at Dobar in the Guban ; while 

 a Jurassic limestone, probably of Bathonian date, occurs at 

 Bihendula in the Guban. Eossils collected from these limestones 

 and from raised reefs of Pleistocene age, by Mr. and Mrs. Lort 

 Phillips, Miss Giliet, Mr. G. P. V. Aylmer, Capt. E. T. Marshall, 

 and Mr. F. B. Parkinson, have been examined by the author, who 

 tabulates a list of corals and echinids. One new genus and fourteen 

 new species of corals are described, belonging to the genera 

 Stylophora, Stylina, Columnastrcea, Prionastrcea, Favia, Metethmos, 

 Cydolites, and Litharcea, and one new species of Pseudodiadema. 

 The evidence of the collections is sufficient to show that a Neocomian 

 limestone occurs both on the summit of the Somali plateau and on 

 the floor of the Guban, and that some marine limestones of Lower 

 Tertiary age (probably Eocene) also occur on the plateau. It is 

 therefore evident that the foundering of the Aden Gulf is post- 

 Eocene in age. 



2. 'Note on Drift-gravels at West Wickham (Kent).' By 

 George Clinch, Esq., F.G.S. 



a The author describes two beds of Drift-gravel at West Wickham. 

 The first, occupying the bottom of a dry valley, yields, in a section 

 exposed at Gates Green, material derived from the Chalk and the 

 Lower Greensand: and distinct, although perhaps not direct, relation 

 with the denudation of the Weald is claimed for it. The other bed 

 of gravel is of later age, and has yielded many Palaeolithic imple- 



