Certain facts have emerged from recent work on Pleistocene problems which allow us to review the position and to mark certain dating points in the correlation of British glacial deposits.

THE problem of the formation of the larger masses of granite is receiving considerable attention by geologists at the present time, and it is hoped that the following observations and surmises regarding the granites of Southern Rhodesia may be of more than local interest. Southern Rhodesia forms part of a typical Pre-Cambrian shield and consists, apart from younger formations, of about 74,000 square miles of granite and gneiss intrusive into 13,000 square miles of older rocks. The area has undergone tremendous denudation, which took place mainly during the Pre-Cambrian, and the structures exposed, therefore, are different from those seen in regions where only the peaks of granite masses have been uncovered.

At the outset I wish to thank Mr. H. B. Maufe for permission to draw from the store of information, much of it unpublished, which he has collected in the Geological Survey Office at Salisbury, and also for having the accompanying illustrations drawn in the office. This information includes both petrological and structural data, but it is only the structural aspect of the problem which it is intended to discuss here.

IN his interesting paper entitled “ The Petrography of the Hunstanton Red Rock”1 Dr. R. H. Rastall arrived at conclusions regarding the relation of the Red Rock to the strata below and above it which are strikingly at variance with the result of our own examination of the series exposed in the well-known cliffsection at Hunstanton.2 While we considered that the Red Rock has no connection with the underlying Carstone, though resting on it with apparent conformity, and that the junction between these contrasted, beds marks a stratigraphical gap of great magnitude, we found no reason to recognize a break between the top of the Red Rock and the overlying Chalk. Dr. Rastall, on the other hand, impressed by the fact that there is a certain gradation and an appearance of conformability between the Carstone and the Red Rock, took this as showing continuity between these deposits; while the appearance of a physical break at the top of the Red Rock seemed to him to contradict our view that the top bed of the Red Rock and the Chalk above (“ Sponge Bed ”) are inseparable geologically.

FROM 7th to 20th July, representatives of the Geological Surveys of Southern Equatorial Africa met at Kigoma to discuss the compilation of a geological map of this part of the Continent. The Conference constituted the first meeting of the Sub-Commission of African Geological Surveys formed at the XVth International Geological Congress at Pretoria in 1929, and the countries represented at Kigoma were as follows: French Equatorial Africa, Northern Rhodesia, Belgian Congo, Ruanda Urundi, Uganda, Tanganyika Territory, and Nyasaland.