46 Reports & Proceedings — Geologists' Association. 



Apjoendix I, on the Non-Marine Mollusca, is sujDplied by A. S. 

 Kennard, F.G.S., and B. B. Woodward, F.L.S., F.G.S. 



Lists are given of the non-marine mollusca from the various 

 sections, with their degrees of frequency. These lists are based on 

 examination of old collections and on a large amount of new 

 material. Notes are appended on some of the species, and con- 

 clusions as to the ages of the Cambridge gravels are given, based 

 on the molluscan evidence. 



Appendix II, on the Imj)lements, is sujDj)lied by Miles C. Burkitt, 

 M.A. 



Geologists' Association. 

 December 5, 1919. 



The following lecture was delivered : " Geological Work on the 

 Western Front." By W. B. E. King, B.A., F.G.S. 



A short descri2Dtion was given of the geology of that part of 

 Belgium and France over which military operations were conducted 

 by the British armies between 1915 and the summer of 1918. 



It was mainly confined to the lithological divisions and did not 

 deal with the palseontological side of the subject. The main physical 

 features were taken, showing how they are connected with the 

 geological structure. 



The effect of the geology and the geological structure on certain 

 questions of military operations were dealt with, notably with regard 

 to water supply and military mining and dug-out construction. 

 Particular attention was paid to the problem of obtaining water from 

 boreholes in the Landenien (Thanet) Sands, the causes and effect 

 of the seasonal variation of water-level in the Chalk, and the problem 

 of the military mines near Messines, Givenchy-les-la-Bassee, and 

 Souchez. 



The lecture ended with a description of certain maps which were 

 prepared for the armies in France, and notes on several other 

 problems which had to be dealt with by the geologists attached to 

 General Headquarters. 



Liverpool Geological Society. 



November 11, 1919.— W. T. Walker, Esq., B.Sc, F.G.S., President, 



in the chair. 



The following communications were read : " The Contribution 

 of a local Geological Society to a Regional Survey." " Marl and 

 Marling in Cheshire." By William Hewitt, B.Sc. 



The idea of a fairly complete systematic survey of a district — 

 comprising its physiographical and geological features, its climatic 

 record, its botanical and zoological poj^ulation and distribution, its 

 ethnographical and archseological history, its agricultural and 

 industrial conditions and their evolution — as the basis of a care- 

 fully planned scheme of development for the district as a whole,. 



