86 Reports and Proceedings — 



IT.— January, 7, 1891.— A. Geikie, LL.D., F.E.S., President, in 

 the Chair. — The following communications were read : — 



1. " On the North-west Eegion of Charnwood Forest, with other 

 Notes." By the Eev. E. Hill, M.A., F.G.S., and Prof. T. G. Bonney, 

 D.Sc, LL.D., F.E.S., V.P.G.S. 



The paper contains the results of a re-examination of the North- 

 west Eegion, when the authors had the advantage of using the 

 Six-inch Ordnance-map, published since the completion of their 

 former work. In this they had expressed the opinion that the rock 

 of Peldar Tor and that of High Sharpley were somewhat altered 

 pyroclastics, being much influenced by the non-igneous origin asserted 

 for the " porphyroids " of the Ardennes. But in 1882 one of them 

 had visited this region, and was then convinced that the porphyroids, 

 which closely resembled the rock at Sharpley, were felstones which 

 had been rendered schistose by subsequent pressure. The result of 

 their subsequent work in Charnwood has convinced the authors that 

 the rocks of Sharpley and of Peldar Tor are in the main of a like 

 origin and history. The mass of Bardon Hill, where the quarries 

 have been much enlarged, has also been studied, and some details in 

 the section formerly published have been corrected. The schistose 

 bands, on which the authors relied as marking horizons for strati- 

 graphical purposes, prove to be zones of exceptional crush. The 

 occurrence of a rock exactly resembling that of Peldar Tor is fully 

 established. It is extremely difficult to decide upon the true nature 

 of the rocks which are chiefly worked in the pit, but the authors 

 remain of opinion that for most of them a pyroclastic origin is the 

 more probable. 



Some notes are added upon the relations of the holocrystalline 

 igneous and the sedimentary rocks of the Forest, upon the Black- 

 brook group, and upon the fragments and pebbles in certain of the 

 coarser ashy deposits. Some remarks are made upon the glacial 

 phenomena exhibited in the Forest-region ; these indicate that this 

 cannot have been overridden by a great northern ice-sheet and it 

 does not afford the usual signs of the action of local glaciers. At the 

 same time it has been a centre of dispersion for erratics, especially 

 towards the south and south-west, these being found sometimes more 

 than twenty miles away. Hence, in the opinion of the authors, the 

 erratics have been distributed by floating-ice during an epoch of 

 general submergence. Some minor " Corrigenda " in the earlier 

 papers are noted, with certain changes in the names of localities, 

 bringing them into harmony with the Six-inch map. 



2. •' Note on a Contact-Structure in the Syenite of Bradgate 

 Park." By Prof. T. G. Bonney, D.Sc, LL.D., F.E.S., V.P.G.S. 



The author described a specimen, obtained at Bradgate Park, 

 showing a junction of the syenite and slaty rock of Charnwood. 

 The latter rock is very slightly altered ; the former exhibits a 

 number of grains of felspar and quartz set in a matrix which has 

 now a " trachytic," now a devitrified structure. He traced the 

 former into the " micrographic " structure observed generally in 

 these syenites, and discussed its significance. His study of these 



