Geological Society. 477 



places of occurrence in the British Isles, and their relative thick- 

 nesses. Notes also, to similar effect, on the Metamorphic and 

 Igneous rocks are supplied. The later determinations of geologists 

 as to the better division and classification of some of the recognized 

 groups of strata are, in several instances, incorporated where they 

 are not likely to be otherwise than clear and useful to the student ; 

 and there are but few points in printing or arrangement which 

 we would find fault with. We therefore recommend this Chart 

 as having been carefully revised by its well-known accomplished 

 author, and as having been brought up to the latest date in useful 

 information, and forming a complete and ready Geological Synopsis 

 for the several lines of study indicated above. 



LIU. Proceedings of Learned Societies. 



GEOLOGICAL SOCIETY. 



[Continued from p. 151.] 



November 1, 1882.— J. W. Hulke, Esq., F.B.S., President, 

 in the Chair. 



rpHE following communications were read : — 

 -■- 1. " The Hornblendic and other Schists of the Lizard Dis- 

 trict, with some Additional Notes on the Serpentine." By Prof. 

 T. G. Bonney, M.A., F.B.S., See. G.S. 



The author described the metamorphic series, chiefly characterized 

 by hornblendic schist, which occupies the southern portion of the 

 Lizard and an extensive tract to the north of the serpentine region, 

 besides some more limited areas. He found that this series was 

 separable into a lower or micaceous group — schists with various 

 green minerals (often a variety of hornblende), or with brownish 

 mica ; a middle or hornblendic group, characterized by black horn- 

 blende ; and an upper or granulitic group, characterized by bands 

 of quartz-felspar rock, often resembling in appearance a vein-granite. 

 These are all highly metamorphosed ; yet the second and third occa- 

 sionally retain to a remarkable extent indications of the minuter 

 bedding structures, such as alternating lamination and current- 

 bedding of various kinds. They form, in the author's opinion, one 

 continuous series, of which the uppermost is the thinnest. The 

 general strike of the series, though there are many variations, is 

 either K.W. or W.N/W. 



The junctions of the Palaeozoic with the metamorphic series at 

 Polurrian and at Porthalla were described. These are undoubtedly 

 faulted ; and the two rocks differ greatly, the former being a slate 

 like any ordinary Palaeozoic rock, the other a highly metamorphosed 

 schist. Moreover fragments of the hornblende schist and a kind of 

 gneiss occur in a conglomerate in the former, S. of Kare Point. 



The author considers the metamorphic series (the microscopic 



