384 Correspondence — F. Barke. 



III. — Geologists Association. 



July 4, 1919.— Mr. J. F. x\ T . Green, B.A., F.G.S., President, in the 



Chair. 



The following lecture was delivered: "The Geology of the 

 Llangollen District." By L. J. Wills, M.A., F.G.S. 



The lecture dealt with the following: — 



1. The General Sequence of Rocks. — The Carboniferous, the 

 Ludlow and Wenlock (Denbighshire type of Salopian Series), the 

 Tarannon - Llandovery (Valentian Series), the Ashgillian and 

 Caradocian (Bala Series). Notes on the fossils and zonal divisions 

 and on the igneous rocks. 



2. The General Structure. — The Carboniferous unconformity, the 

 Llangollen synclinorium, the Berwyn and Cyrn-y-brain anticlines 

 and the Bala fault, the cleavage and faulting. 



3. The Glacial History of this Part of the Chester Bee. — The 

 Welsh and Irish Sea ice-sheets in conflict, the phenomena of the 

 retreat of the ice, the changes in the physical geography and effect 

 on the human occupation. 



COREE3SPOITDE]SrCE. 



THE CAEBONIFEEOUS LIMESTONE OF THE WEEKIN DISTEICT. 



Sir, — In the February number of the Geological Magazine, p. 77, 

 Mr. Parsons states that with the exception of one or two references 

 to the Lower Carboniferous rocks of the area made in Geology in 

 the Field, there does not appear to be any published description of 

 the limestone of the district. 



This statement overlooks the fact that a paper on "The Car- 

 boniferous Limestone of Lilleshall " by Wheelton Hind, M.D., F.G.S., 

 etc., is printed in the Trans. N. Staffs Field Club, vol. xxxv, 

 pp. 107-9, 1900-1, giving a section of the beds nearer to Lilleshall 

 Hill, just below the wharf. 



And again, some members of the geological section of the same 

 club visited these quarries on a subsequent occasion, and a list of 

 Corals, Crinoidea, and Brachiopoda observed are recorded in 

 vol. xliii, p. 109, 1908-9. 



In the same number of the Geological Magazine, pp. 59-64, 

 there is a paper " On the Discovery of a Quartzose Conglomerate at 

 Caldon Low, Staffs" by J. Wilfrid Jackson, F.G.S., and W. E. 

 Alkins, B.Sc. The writers of this paper report a discovery of an 

 exposure of a quartzose conglomerate in a quarry at the Low. 



This deposit was discovered in 1905 by members of the Geological 

 section of this club, and the fact recorded in the Trans., vol. xl, 

 p. 85, 1905-6. 



F. Baeke, 

 Chairman of Geological Section of N. Staffs Field Club. 

 Stoke-on-Trent. 



June 6, 1919. 



