Downloaded from http://jgslegacy.lyellcollection.org/ at University of California-San Diego on July 5, 2016 PROCEEDINGS OF TKE GEOLOGICAL SOCIETY OF LONDON. SESSION 1893-9r November 8th, 1893. W. H. HU~)LESTON, Esq., ~[.A., F.R.S., President, in the Chair. Louis Henry Cooke, :Esq., Assoc.R.S.M., Assistant to the Pro- fessor of Mining at the Royal College of Science, Loddington, Ket- tering, and Richard A. S. Redmayne, Esq., Harewood, Gateshead- on-Tyne, were elected Fellows ; and Monsieur Ed. Rigaux, Boulogne- sur-Mer, was elected a Foreign Correspondent of the Society. The List of Donations to the Library was read. Prof. J. W. Jura) made a few remarks in explanation of the specimen exhibited by him. The following communications were read :-- 1. ' The Geology of Bathurst, New South Wales.' By W. J. Clunies Ross, Esq., B.Sc., F.G.S. 2. ' The Geology of Matte Grosso (particularly of the Region drained by the Upper Paraguay).' By J. W. Evans, D.Sc., LL.B., F.G.S. 3. ' Notes on the Occurrence of Mammoth-remains in the Yukon District of Canada and in Alaska.' By George M. Dawson, C.M.G., LL.D., F.R.S., F.G.S. The following specimens were exhibited :- Sections and rock-specimens from the District of Bathurst, ~ew South Wales, exhibited by J. T. Day, Esq., F.G.S., in illustration of Mr. W. J. Clunies Ross's paper. Sections and rock-specimens from Matte Grosso, exhibited by J. W. Evans, D.Sc., LL.B., F.G.S., in illustration of his paper. Examples of Composite 'Contemporaneous'Veins (Aplite) tra- versing the Granite of Beinn Cruachan, Argyllshire, exhibited by Prof. J. W. Judd, F.R.S., V.P.G.S. VOL. L. a Downloaded from http://jgslegacy.lyellcollection.org/ at University of California-San Diego on July 5, 2016 ~ROC~v.vrsas o~ ~a~ G~Or.OO~CAT.socrETY. [Feb. ~894, Specimens of Cassiterite, Antimonite, Zaratite, and Phaeoli~e, from Victoria, Australia, exhibited by F. Danvers Power, :Esq., F.G.S. Specimen from Goathurst Common, near Ide Hill, Kent, exhibited by the Rev. R. Ashington Bullen, B.A., F.G.S. November 22nd, 1893. W. H. Hva)r~s~o~, Esq., M.A., F.R.S., President, in the Chair. George Henry Hill, :Esq., M.Inst.C.:E., 3 Victoria Street, S.W., and Albert Chambers, Albert Square, Manchester, was elected a Fellow of the Society. The List of Donations to the Library was read. The Secretary announced that Prof. ;l. Prestwich, D.C.L., F.R.S., had presented a large framed photograph of himself to the Society. The following communications were read :-- 1. ' The Basic Eruptive Rocks of Gram' By W. C. Briigger, Ord. Prof. of Min. and Geol. in the University of Christiania, For. Memb. Geol. Soc. 2. ' On the Sequence of Perlitic and Spherulitic Structures (a Rejoinder to Criticism).' By Frank Rutley, Esq., F.G.S. 3. ~:Enclosures of Quartz in Lava of Stromboli, etc., and the Changes in Composition produced by them.' ~ By Prof. H. J. Johnston-Lavis, M.D., F.G.S. [Abstract.] The Author describes the existence of enclosures of quartz in a lava-stream at the Punta Petrazza on the east side of Stromboli, and also in the rock of the neck of Strombolicchio. He describes the effects of the rocks upon the enclosures, concluding that the quartz has undergone fluxion but not fusion, and has supplied silica to the containing lavas, thus causing an increase in the amount of pyroxene and a diminution in the amount of magnetite in the portions of those lavas that surround the inclusions and raising the percentage of silica. He suggests that such a process at greater depths and higher temperature may, under certain conditions, convert a basic rock into a more acid one, so that possibly the andesite of Strombo- licehio may have been of basaltic character at an earlier period of its progress towards the surface. He offers the suggestion that other rocks or minerals once associated with the quartz have been assimilated by the magma. 1 This paper has been withdrawn by permission of the Council. Downloaded from http://jgslegacy.lyellcollection.org/ at University of California-San Diego on July 5, 2016 Vol. 5o.~ PRoc~i~os oP Tlr~ aXOT.OOICAZseemlY. 3 D~sc~ssioN. The P~SrDV.NT and Prof. JUDD spoke. The following specimens were exhibited :~ Rock-specimens exhibited by Prof. W. C. BrSgger, For.Memb.G.S., in illustration of his paper. Specimens and microscope-sections, exhibited by Frank Rutley, Esq., F.G.S., in illustration of his paper. Specimens and microscope-sections, exhibited by Prof. H. J. 3ohnston-Lavis, ~[.D., F.G.S, in illustration of his paper. new mineral found at Grcenbushes, Bunbury, Western Aus- tralia, associated with alluvial Cassiterite, exhibited (with analysis) by F. Danvers Power, Esq., F.G.S. December 6th, 1893. W. H. HUD~STON, Esq., M.A., F.R.S., President, in the Chair. Henry Dyke Acland, Esq., Great Malvern ; John Forbes Bryant, Esq., B.A., Clare College, Cambridge; David Draper, Esq., Lennox- ton, Newcastle, Natal; Gavin H. Jack, Esq., 10 Pennel Square, Pontypridd, South Wales ; Septimus Heslop, Esq., Asansol, E.I.R., India; James Henry Howarth, Esq., The Crescent, Newton Park, Leeds; William Humble, Esq., Wickham, Newcastle, New South Wales; Arthur Walton Rowe, Esq., M.S., M.B., M.R.C.S., 1 Cecil Street, Margate; Joseph Scott, Esq., Newcastle Street, Stockton, New South Wales ; William Simpson, Esq., Savile Mount, Halifax ; Victor Streieh, Esq., care of Messrs. Harrold Brothers, Adelaide, South Australia; John James Turnbull, Esq., Giridih, E.I.R., Bengal, India; and Albert Wflmore, Esq., Trawden, Co]he, Lanca- shire, were elected Fellows of the Society. The List of Donations to the Library was read. In explanation of a specimen exhibited by F. B. Du Pre, Esq., ~[.A., F.G.S., Mr. HosAen W. Mo~cxTox remarked that the specimen came from a dyke in the Broekwell Seam at the Crox- dale Colliery, about 2 miles south of Durham, depth 80 fathoms. This is probably the dyke described by Mr. TealI as 2 miles north of the ttett Dyke (' Brit. Petrography,' p. '202). The greater part of the rock is composed of lath-shaped pla~oclase-fe!spar; the remainder appears to be au~te, or change-products after augite, and iron oxide. The following communications were read :-- 1. ' The Purbeek Beds" of the Vale of Wardour.' By the Rev. W. R. Andrews, M.A., F.G.S., and A. J. Jukcs-Browne, Esq., B.A., F.G.S. 2. ' On a Picrite and other associated Rocks at Barnton, near Edinburgh.' By Horace W. Monckton, Esq., F.L.S., F.G.S. Downloaded from http://jgslegacy.lyellcollection.org/ at University of California-San Diego on July 5, 2016 4 PROCEEDINOS 01~ THE OE0r.OOI0~L SOCIETY. [Feb. 1894 , 3.' On a Variety of Ammonite. (Stephwnoeera,) subarrnatus, Young, from the Upper Lias of Whitby.' By Horace W. Monckton, Esq., F.L.S., F.G.S. [Abstract.] The Author exhibited an ammonite found by himself in 1874 near Sandsend, 3 miles north-west of Whitby. He thinks it was not actually in situ, but lying with a number of nodules on the floor of an old alum-pit, although he has no doubt that it is from the Alum Shale of the Upper Lias. A peculiar arrangement of the costm as they cross the siphonal area distinguishes the specimen from other Whitby ammonites known to the Author. It bears a strong resemblance to a shell figured as A. subarmatus by D'Orbigny, ' Terr. Jurass.,' pl. lxxvii., but is unlit:e the figures of that species given by other authors. DlSCtlSSlOl~. Prof. J. F. BLAKE said that the ammonite in question seemed nothing unusual. It would be included in the varieties or mutations of subarmatus, the genus of which was not Stephanoceras. Mr. GEo~o~. C. CRIC~ also spoke. The AUTHOR, in reply, pointed out that he only claimed his fossil to be a variety, not a new species ; and if a variety, it must be a variety of some species. He thought it was less unlike A. sub- armatus than other Liassic species. In any case, it was, he thought, the A. subarmatus of D'Orbigny, and in assigning that species to Ste.z~hanoceras he had simply followed Dr. Wright. In addition to the specimen described on the preceding page, the following were exhibited :- Rock-specimens from Barnton, near Edinburgh; and specimen of Ammonite. subarmatus, var., from the Lias of Whitby, exhibited by Horace W. Monckton, Esq., F.L.S., F.G.S., in illustration of his papers. Specimens of Scottish Granite, exhibited by Horace W. Monck~on, Esq., F.L.S., F.G.S. December 20th, 1893. W. H. HU])~ESTO~, Esq., M.A., F.R.S., President, in the Chair. Arthur ]=[assam, Esq., Waverley House, Fenton, Stoke-on-Trent; Robert Ludwig Mond, Esq., M.A., F.R.S.E., F.C.S., The Poplars, 20 Avenue Road, Regent's Park, N.W. ; and Llewellyn Treacher, Esq., Somercroft, Twyford, Berkshire, were elected Fellows ; Dr. E. Mojsisovics yon Mojsv~ir, Vienna, and Dr~ A. G. Nathorst, Stock- holm, Foreign Members; and Dr. S. L. TSrnquist, Lund, a Foreign Correspondent of the Society. The List of Donations to the Library was read. The following communications were read :-- Downloaded from http://jgslegacy.lyellcollection.org/ at University of California-San Diego on July 5, 2016 Vol. 5o.] rl~OCr~rr~osoF ~rr ororo~ieAr soci~.~r. 5 1. ' On the Stratigraphieal, Lithologieal, and Pala~ontological Features of the Gosau Beds of the Gosau District, in the Austrian Salzkammergut.' :By Herbert Kynaston, Esq., :B.A.