﻿part 1] PEOCEEDISTGS OF THE GEOLOGICAL SOCIETY. lxxxiii 



June 28th, 1916. 



Dr. Aleeed Haekeb, F.R.S., President, 

 in the Chair. 



Herbert Theodore Mayo, B.A., care of Port Master, Rawal 

 Pindi (India) ; and William Guy de Gruchy Warren, Capel Issa, 

 Manordilo (Carmarthenshire), were elected Fellows of the Society. 



The List of Donations to the Library was read. 



The following communications were read : — 



1. ' On a New Species of Edestus from the Upper Carboniferous 

 of Yorkshire.' By A. Smith Woodward, LL.D., F.R.S., V.P.G.S. 

 With a Geological Appendix by John Pringle, F.G.S. 



2. ' The Tertiary Volcanic Rocks of Mozambique.' By Arthur 

 Holmes, D.I.C., B.Sc, A.R.C.Sc, F.G.S. 



Dr. A. Steahan, F.R.S., exhibited cores from borings 

 in Kent, showing pebbles of coal embedded in Coal- 

 Measure sandstones. With the coal-pebbles occurred a few 

 partly-rounded fragments of chert, and in one of these radiolaria 

 had been identified by Dr. G. J. Hinde. The chert resembled 

 that which had been described from Lower Carboniferous rocks 

 elsewhere. Its occurrence suggested that the sequence of strata 

 had been similar in South Wales and Kent, and, taken in con- 

 nexion with the piping of the limestone-surface at Ebbsfleet and 

 the absence of Millstone Grit in Kent, tended to confirm the 

 view that there is unconformity between the Coal Measures and 

 the Carboniferous Limestone in that county. 



Mr. F. P. Mennell exhibited a geological sketch-map 

 of the northern margin of Dartmoor. 



He said that the central part of Devon was to a great extent 

 a terra incognita ; but, as regarded the fringe of altered Carbon- 

 iferous rocks along the northern border of the Dartmoor granite, 

 he had been led, in the course of observations originally concerned 

 with the petrology alone, to the conclusion that it might prove 

 possible to establish a definite order of succession. This was 

 rendered feasible by the occurrence of some well-characterized 

 bands of rock, especially limestones and tuffs, which were exposed 

 in every good river-section. It was true that almost everywhere 

 overfolds, sometimes accompanied by thrusts, were to be de- 

 tected, and tended to make the observer somewhat doubtful of 

 his ground. Nevertheless, it seemed impossible to escape the 

 conclusion that, as one approached the granite from the north, 

 continuously older rocks were met with, and the extremely 



