284 Reports and Proceedings — Geological Society of London. 



Geological Society of London. 



April 19th, 1905.— Horace B. Woodward, F.RS., Vice-President, in 

 the Chair. The following communicatious were read : — 



1. "The Blea Wyke Beds and the Dogsjer ia North-East York- 

 shire." By Robert Heron Rastall, B.A., F.G.S. 



The author describes the type- section at Blea Wyke in detail, 

 dividing the rocks into the following divisions, enumerated in 

 descending order : — 



ft. in. 



5. Dogger 11 6 



4. Yellow Beds 53 



3. Serpula Beds 10 6 



2. Lingiila Beds 32 



1. Striatultis Shales. 



Descriptions and fossil lists from these divisions are given, and 

 then the succession is compared with that shown at Peak Alum 

 Works, Saltwick and Whitby, Sandsend and Kettleness, Boulby 

 Cliff, Falling Foss and Littlebeck, Eskdaleside and Grosmont, 

 Glaisdale, and along the north-western escarpment of the Cleveland 

 Hills. A complete series from the Lias to the Lower Estuarine 

 Series is seen only at Blea Wyke ; at other sections the transition 

 from Alum Shale to Dogger is abrupt, and the characteristic passage- 

 beds are absent, In all these sections there are signs of uncon- 

 formity, and in most cases there is a well-marked pebble-bed of 

 peculiar character. In many localities the upper surface of the Lias 

 is worn into distinct hollows, in which lenticular masses of sandstone 

 have been deposited. Probably shallow-water conditions and strong 

 currents prevailed over a wide area. This was most likely brought 

 about ))y a slow elevation which was more prominent in the northern 

 part of the area, as tliough the Peak Fault were partly of pre-Oolitio 

 date. This fault probably formed a submarine clifl", and in the still 

 waters at its foot the Blea Wyke passage-beds were formed. North 

 of the fault erosion was active, planing down the Lias to a more 

 or less level surface, with occasional deep hollows due to strong 

 currents. Eventually the upward movement ceased, and the hollow 

 below the fault was filled up, so that the Dogger was laid down as 

 a continuous bed over the whole area. The uplift to the north was 

 probably much greater ; consequently the v/hole of the Upper Lias 

 was removed, and the Middle Lias reached and denuded. Pebbles 

 derived from the Middle Liassic Ironstone occur in the basement 

 conglomerate of the Wainstones, according to Prof. P. F. KendalL 



2. " Notes on the Geological Aspect of some of the North-Eastern 

 Territories of the Congo Free State." By Gaston Felix Joseph 

 Preumont. (Communicated by John Allen Howe, B.Sc, F. G. S.) 

 With Petrological Notes by j. Allen Howe, B.Sc, F.G.S. 



This paper is a brief sketch of the geological structure of the 

 northern part of the Congo State, from Buta on the River Rubi and 

 Bima on the Uelle in the west, to Lado and Dufile on the Nile. 



