[ 505 ] 

 L1V. Proceedings of Learned Societies. 



GEOLOGICAL SOCIETY. 



[Continued from p. 348.] 



June 8th (cont.).— W. Whitaker, B.A., F.R.S., President, 



in the Chair. 



3. * On some High-level Gravels in Berkshire and Oxfordshire.' 



By 0. A. Shrubsole, Esq., F.G.S. 



The high-level gravels are divided by the author as follows, 

 beginning with the oldest : — 



1. Pebble -gravel, composed very largely of flint or chert. 



2. The Groring Grap gravel. 



3. Quartzose gravel, with only a small proportion of flint-pebbles. 



4. Q uar tzite-g ravel, with purple and brown quartzite-pebbles, 



5. Local flint-gravels. 



The pebbly contents of these gravels are expressed in per- 

 centages. The Pebble-gravel occurs on the higher plateaux of the 

 Chiltern Hills, and a suggestion is thrown out that it may possibly 

 be of Diestien age. The Goring Gap gravels contain a large pro- • 

 portion of subangular flint. The Quartzose gravels are distinguished 

 by a certain proportion of opaque and vitreous quartz-pebbles and 

 a small number of quartzite-pebbles, generally pale in colour: 

 a small flint-flake was found in them at Bowsey Hill; amongst 

 the possible sources of the constituents of this bed, old pebble-beds 

 like those of Potton and Upware are mentioned. The Quartzite- 

 gravel is widespread, aud is found at heights varying from 294 

 to 544 feet. There is a gravel-pit near Moreton-in-the-Marsh, 

 close to the source of the Evenlode, which shows an exceptionally 

 large proportion of quartzite-pebbles, both smaller and larger than 

 6 inches in diameter. Farther on, similar gravels may be traced 

 through Evesham, up the Salwarp valley, and into the Lickey 

 district ; the author conjectures that the source of the quartzite- 

 pebbles may lie in the direction of Warwickshire and the Midlands. 

 Small flint-flakes usually having one bulb of percussion have been 

 found in all the gravels except the oldest. The value of these 

 flakes as evidence is disputed. 



4. ' The G!obige?*i>ia-m.?LTh of Barbados.' By G. F Franks, Esq., 

 F.G.S., and Prof. J. B. Harrison, M.A., F.G.S. With an Appendix 

 on the Foraminifera by F. Chapman, Esq., F.R.M.S., A.L.S. 



After a reference to previous publications on the island by one of 

 the authors and Mr. Jukes-Browne, an account is given of the 

 tectonic structure of Bissex Hill, on which the principal exposures 

 of the Globigerina-m&rl occur. Five faults are described, four of 

 which cut all the rocks, while the fifth disturbs the Scotland Beds 

 and the Oceanic Series, but leaves the overlying Globigerina-m&A 

 undisturbed. 



The general succession is as follows : — The Scotland Beds are 

 overlain unconformably by the Oceanic Series, which shows the 

 usual succession from chalks to calcareo-siliceous beds, aud in places 

 to the upper chalks, the overlying red clays being absent. Then 

 follows, unconformably, a detrital bed of Globigerina-m&rl containing 

 rolled pebbles of various parts of the Oceanic Series, especially the 



