[ 296 1 



XXIX. Proceedings of Learned Societies. 



GEOLOGICAL SOCIETY. 



[Continued from p. 160.] 



January 10th, 1917.— Dr. Alfred Harker, F.R.S., President, 

 in the Chair. 



r 5pHE following communications were read : — 



1. ' On the Palaeozoic Platform beneath the London Basin and 

 Adjoining Areas, and on the Disposition of the Mesozoic Strata 

 upon it.' By Herbert Arthur Baker, B.Sc, F.G.S. With an 

 Appendix by Arthur Morley Davies, D.Sc, F.G.S. 



The author carries on the work of Dr. A. Strahan and Dr. Morley 

 Davies in tracing the contours of the Palaeozoic platform of the 

 South-East of England. By comparing these with the contours of 

 the base of the G-ault, he determines the probable boundaries of the 

 areas of the platform that were only submerged finally under the 

 Gault sea. He analyses the effects of post- Cretaceous tilting and 

 warping, and presents a map illustrating the contours of the Palaeo- 

 zoic floor at the end of the Lower Cretaceous Period. 



He next discusses the successive Mesozoic overlaps on the plat- 

 form, the probable areas that they respectively cover, and the 

 relation of these to the tectonics of the platform itself. He claims 

 that there is evidence for a second Charnian axis, parallel to that 

 traced by Prof. P. F. Kendall, proceeding south-eastwards through 

 Norfolk and Suffolk, east of Kent, to the North of France. He 

 further suggests that the area 'between these two geo -anticlines is 

 a geo-syncline, which, in Mesozoic times, in consequence of the 

 accumulation of sediments within it, and the continued operation 

 of Charnian movement, became converted into an anticline (as in 

 the case of the Wealden area). 



In an Appendix, Dr. Morley Davies discusses the interpretation 

 of the Saffron -Wal den boring, and its bearing on the supposed 

 inter- Charnian trough ; he also points out evidence of a post- 

 Cretaceous Charnian anticline under London. 



2. 'Balston Expedition to Peru: Report on Graptolites col- 

 lected by Capt. J. A. Douglas, E.E., F.Gr.S.' By Charles Lapworth, 

 LL.D., M.Sc„ F.R.S., F.G.S. 



