Stratigraphy of the Bag shot Beds of the London Basin. 67 



3. " Notes on Specimens collected by W. Gowland, Esq., F.C.S., 

 in the Korea." By Thomas H. Holland, Esq., of the Geological 

 Survey of India, late Berkeley Fellow of the Owens College. 



The southern half of Korea traversed by Mr. Gowland is of a 

 hilly character. The rocks forming the hills are chiefly crystalline 

 schists — gneisses with graphite, garnet, dichroite, and fluor occur- 

 ing in considerable abundance, and the whole group is probably 

 part of the great Archaean mass of North-east China. The author 

 describes these metamorphic rocks in detail. 



Stratified rocks, probably of Carboniferous age, lie unconformably 

 upon the schists in the south-eastern part of the peninsula, and 

 petrographical notes of these are given in the paper. Through the 

 crystalline schists and stratified rocks various igneous rocks have 

 been erupted as dykes 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 between 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 Korea. 



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

 the London Basin (north side)." By the Rev. A. Irving, D.Sc, 

 F.G.S. 



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

 clay-pits recently opened, and excavations, confirming the reading of 

 the country between Wellington-College and Wokingham Stations 

 on the S.E. Railway, 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 out- 

 lier into stratigraphical alignment with the basal clays of the Middle 

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

 ment 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 brings out the lithological identity of these and of the sands cap- 

 ping Farley Hill with the basal beds of the Upper Sands at Welling- 

 ton College and on Finchampstead Ridges. The accidental occurrence 



