42 Reports and Proceedings — 



crystalline schists and stratified rocks various igneous rocks have 

 been erupted as djkes or in large masses. Amongst these the most 

 conspicuous rock is granite. Biotite- and muscovite-granite are 

 most widely distributed, and in places are cut by dykes of eurite 

 and veins of quartz and pegmatite. The more basic class of rocks 

 is represented by diorites, propylites, andesites, basalts, dolerites, 

 and gabbros. Interesting cases of the gradual passage betvsreen the 

 so-called intermediate and basic rocks are found, and various stages 

 in the devitrification and decomposition of andesitic lavas represented. 

 These are described in detail by the author, and compared with 

 similar cases in other regions ; and full descriptions of the intrusive 

 rocks are furnished. 



There are now no active volcanoes ; and there is a notable lack of 

 mineral wealth in the southern part of the Koi'ea. 



4. " Further Notes on the Statigraphy of the Bagshot Beds of the 

 London Basin (north side)." By the Eev, A. Irving, D.Sc, F.G.S, 



1. The author brings forward new evidence from well-sections, 

 clay-pits recentl}' opened, and excavations, confirming the reading of 

 the country between Wellington-College and Wokingham Stations 

 on the S.E. Eailway, as put forward by him in 1887 (Q. J. G. S. 

 vol. xliii. and figure 1 of the paper). We have now actual data for 

 the gradients of the clay-beds, and the thinning-out of both the 

 Lower (fluviatile) Sands and of the Middle green-earth series; the 

 latter, when taken into account, bringing the clays in the Wokingham 

 outlier into stratigraphical alignment with the basal clays of the 

 Middle Group. Certain clays at California are also shown to be in 

 alignment with these ; and a sketch-section from Ambarrow to 

 Barkham Hill shows the relative gradients of certain horizons to be 

 such as to justify the relegation of the Pebble-bed there to the base 

 of the Upper Sands ; while a microscopical examination of the sands 

 above it lirings out the lithological identity of these and of the sands 

 capping Farley Hill with the basal beds of the Upper Sands at 

 Wellington College and on Finchampstead Ridges. The accidental 

 occurrence of thin seams of pipe-clay is rejected as a test of horizons, 

 as affording onl^' ambiguous evidence. 



2. A similar succession is shown in a section drawn from Wel- 

 lington College Well through the sand-pit at the brick-yards by 

 Ninemile Eide (base of the Middle Clays exposed), Easthampstead 

 Church Hill (with more recent data), and Bill Hill (Easthampstead), 

 to the S.W. Eailway at Bracknell, bringing the higher beds of those 

 two hills into the horizon of the Upper Sands. Further notes are 

 also added to those of the author's 1888 paper (Q.J.G.S. vol. xliv.) 

 on the Ascot Hills, Englefield Green, and Windsor Park, where the 

 transgressive relation of the Bagshot Beds to the London Clay is 

 maintained. 



3. In conclusion, the author points out that the new well-sections 

 confirm the trustworthiness of that at Wellington College as a 

 vertical datum-line ; he criticises the views of previous writers and 

 maintains that, with the aid of Lieut. Lyons' recently published 

 contour-map, we can now discriminate between the effects of con- 



