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THE QUARTERLY JOURNAL OF THE GEOLOGICAL SOCIETY OF LONDON. EDITED BY THE PERMANENT SECRETARY OF THE GEOLOGICAL SOCIETY. Quo4 si cui mortalium eordi et cur~e sit non tantum inventis h~erere, atque iis uti, sed ad ulteriora penetrate ; atque non disputando adversarium, sed opere naturam vincere; denique~non belle et probabiliter opinari, sed eerto et ostensive scire ; tales, tanquam veri seientiarum fllii, nobis (si videbitur) se adj uugant. --zYovum Organum, Pr~fatio. VOLUME THE SEVENTY-FIRST, FOa 1915. LONDON : LONGMANS, GREENp AND CO. PARIS: CHARLES KLINCKSIECK, 11 RUE DE LILLE. SOLD ALSO AT THE APARTMENTS OF THE SOCIETY. MCMXVII. OF THE OFFICERS OF THE GEOI OGICAL SOCIETY OF LONDON. Elected February 19th, 1915. Arthur Smith Woodward, LL.D., F.R.S., F.L.S. ~ict~rtgi~¢nt~. Henry Howe Bemrose, J.P., Sc.D. ] Aubrey Strahan, Sc.D., LL.D., F.R.S. Clement Reid, F.R.S., F.L.S. J The Rev. Henry Hoyte Winwood, M.A. ~ttrctaritg. Herbert Henry Thomas, M.A., Sc.D. I Herbert Lapworth, D.Sc., M.Inst.O.E. ~orrign ~¢crttarp. ~rtagurrr. Sir Archibald Oeikie, O.M., K.C.B., D.C.L., [ Bedford McNeil1, kssoc.R.S.~L LL.D., Sc.D., F.R.S. I Henry Howe Bemrose, J.P., Sc.D. John Edward Marr, M.A., Sc.D., F.R.S. Charles Gilbert Cullis, D.Sc. Edwin Tulley Newton, F.R.S. :R. Mountford Deeley, M.Inst.C.E. Robert Heron Rastall, M.A. John William Evans, D.Se., LL.B. Clement Reid, F.R.S., F.L.S. Prof. William George Fearnsides, M.A. Prof. William John son Sollas, M.A., Se.D., Sir Archibald Geikie, O.M., K.C.B., D.C.L., LL.D., F.R.S. LL.D., Sc.D., F.R.S. Aubrey Strahan, Se.D., LL.D., F.R.S. Waleot Gibson, D.Sc. J. g. Harris Teall, M.A., D.Sc., LL.D., ~Sir Thomas Henry Holland, K.C.I.E., F.R.S. D.Sc., F.R.S. Herbert Henry Thomas, M.A., Sc.D. Prof. Owen Thomas Jones, M.A., D.Sc. William Whitaker, B.A., F.R.S. Finlay Lorimer Kitehin, M.A., Ph.D. The Rev. Henry Hoyte Winwood, M.A. Herbert Lapworth, D.Sc., M.Inst.C.E. Arthur Smith Woodward, LL.D., F.R.S., Bedford McNeill, Assoc.R.S.M. F.L.S. ~[zzigtant--~tcretarp, ~ibrarian, ard~ CItrtk. L. L. Belinfant~, M.Sc. ~ ~i~tant-l[ibraxian. ~t~i~tant--~Itrlk. C. P. Chatwin. M. St. John Hope. ~gi~tant ill ]Lfbrar~ anl~ @flier. Arthur Oreig. STANDING PUBLICATION COMMITTEE. Dr. A. Smith Woodward, President. Dr. H. Lapwortb, Dr. Herbert H. Thomas, ~ Secretaries. Dr. F. A. Bather. Mr. Bedford McNeill. Dr. H. H. Bemrose. Dr. J. E. Marr. Dr. C. G. Cullis. Mr. E. T. Newton. Dr. J.W. Evans. Prof. W. J. Sollas. Prof. W. G. ~earnsides. Dr. A. Strahan. Dr. Walcot Gibson. Dr. J. J. H. Teall. Prof. 0. T. Jones. TABLE OF CONTENTS. Page AND]roSeN, ERNEST MASSON (& E. G. RADL]~Y). The Pitchstones of Mull and their Genesis ............................... 205 BAILRY, EDWARD BATTERSBY (~ H. TT. T~o~As). Notes on the Rock-Species Leidleite and Inninmorite ................ 207, 209 BOSWELL, PERCY G~;oRo]~ HAMNALL. Tire Stratigraphy and Petrology of the Lower Eocene Deposits bf the Noi~th-Eastern Part of the London Basin. (Plates XLVL-LI) ............ 536 COL~, GRENVILT.~ A.J. A Composite Gneiss near Barna (County Galway) .............................................. 183 COX, A.RTHUR HUBERT. The Geology. of the District between Abereiddy and Abercastle, Pembrokeshire. (Plates XXII- XXVI) ' 273 DAwsoN, CHARLES (& A. S. WOO1)W~L1tD). On a Bone Implement from Piltdown~ Sussex. (Plate XIV) ......... , .......... 144 DON, ARCHIBALD WILLIAM ROBWaTSON (& G. HICKLIN6). On 9Parka dedpiens. (Plates LIV-LVI) ................... ... 648 ~UNLOP,ANDR]~W. On a Raised Beach on the Southern Coast of Jersey . .................. ...; ......................... 150 HICXLING, GRORGn (& A. W. R. DON). On Par~&dp~. (Plates LIV-LVI) ...................................... 648 iLLING, VINCENT CHARL]$S. The Paradoxidian Fauna of a Part of the Stockingford Shales. (Plates XXVIII-XXXXrIII) ...... 386 JONES, OWEN THOMAS (& W. J. Pueff). The Geology of the District around Machynlleth and the Llyfnant Valley. (Plate XXVII) . ............................................. 343 a '~ iV TABLE OF CONTEI~;I"8. Page K]gNNARD,ALFRED SANTER (& B. B. ~rOODWARD). Notes on the Mollusca [Lea Valley Deposits] .......................... 179 MARR, JOHN EDWARD. The Ashgillian Succession in the Tract to the West of Coniston Lake .............................. 189 MRNNELL, FREDERIC PHILIP. The Rocks of the Lyd Valley, above Lydford, Dartmoor. (Plate LII) .................... 623 NICHOLAS.TRESSILIAN CHARLES The Geology of the St. Tudwal's Peninsula, Carnarvonshire. (Plates IX-XIII) .............. 83 Notes on the Trilobite Fauna of the Middle Cambrian of the St. Tudwal's Peninsula, Carnarvonshire. (Plate XXXIX) .... 451 PARIS, E. TALBOT (& L. RICKA~RDSON). Sonde Inferior-Oolite Pectini&e. (Plates XLIV & XLV) ...................... 521 PUOH, WILLIAM JOHN (& O. T. JON~S). The Geology of the District around Machynlleth and the Llyfnant Valley. (Plate XXVII) ................................. ............ 343 RADLEY, ERNEST GEORGI~ (& E. M. ANDERSON). The Pitchstones of Mull and their Genesis ................................ 206 RASTALL, ROBERT HERON (.& W.H.WILCOCKSON). The Accessory Minerals of the Granitic Rocks of the English Lake District .. 592 REID, CLEMENT. The Plants of the Late Glacial Deposits of the Lea Valley. (Plate XV) ................................ 155 RICHARDSON, LINSDALL. The Inferior Oolite and Contiguous De~oaits of the Doulting-Milborne-Port 'District, Somerset. (Plates XL-XLIII) ................. ...... ............ 473 -- (& E. T. PARIS). Some Inferior-Oolite Pectini&e. (Plates XLIV & XLV) ............................ ............ 521 SMITH, STANLEY. The Genus Zonsdaleia and Dibunophyllum rugosum (McCoy). (Plates XVII-XXI) .................. 218 ST~LNIER, XAVIER. On a New Eurypterid from the Belgian Coal- Measures. (Plate LHI ) ................................ 639 TRECHMANN, CHARLES TAYLOR. The Scandinavian Drift of the Durham Coast and the General Glaciology Of South-East Durham. (Plale VIII) ................................ 53 VAUGHAN, ARTHUI~. Correlation of Dinantian and Avonian. (Plates I- VII) ........ ................................. 1 TABLE OF CONTENTS, 9 Page WARREN, SAMUEL HAZZLEDINE. Further Observations on the Late Glacial, or Ponder's End, Stage of the Lea Valley. (Plate XVI) 164 "~VILCOCKSON, WILLIAM HOWSON (& R. H. RASTALL). The Accessory Minerals of the Granitic Rocks of the English Lake District ................................................ 59"2 WOODWARD, ARTHUR SMITH (~ (~. DAWSON). On a Bone Imple- ment from Piltdown, Sussex. (Plate XIV) ................ 144 WOODWARD, BRRN~aD BARHAM (& A. S. KEN~ARD). Notes on the Mollusca [Lea Valley Deposits] 179 PROCEEDINGS. Proceedings of the' Meetings .............................. i, lxxvi Annual Report ........................................ ix Lists of Donors to the Library ............................ xiii List of Foreign Members .. ............................... xxiv List of Foreign Correspondents .......................... xxv List of Wollaston Medallists xxvi List of Murchison Medallists .............................. xxviii List of Lyell Medallists . ............................... xxx Lists Of Bigsby and Prestwich Yedallists .................. xxxii Applications of the Barlow-Jameson Fund and Awards from the Daniel=Pidgeon Fund ............................ xxxiii Financial Report xxxiv Awardaof the Medals and Proceeds of Funds ...... ........ xlil Anniversary Address of the President ...................... liii Special General Meetin~ lxxvii FIELD,ALEC. EAnnouncement of decease] ................ lxxviii HILL, WILLIAM. [Announcement of decease] .......... .... ii LYD]~KKER, RICHARD. [Announcement of decease~ ..... .. lxxix PETRIE, W. M. FLINDERS. On the Pal~ozoic Age and its Climate in Egypt .................................. fii LIST OF THE FOSSILS FIGURED AND DESCRIBED IN THIS VOLUME. Namo of Bpoeiee. Formation. [ LoeaLity. [Page ZO~IIAaIA. Uaninia comueopie, pl. iv, i Feluy- ~g. 8a9 .................... Arquennes ... 36 eyli~driea, pl. iii, fig. 5 (38 ---, mut. hast/er/ens/s pl. iii, fig. 2 ................. 37 Carboniferous --- rout. 7, pl. iii, Limestone ... I ~g. 4 +~176................ ....,. { Belgium ......... 38 rout. K, pl. iii, fig. 1 ......................... 37 - - rout. Z, pl. iii, [ I fig. 3 & pl. iv, fig. 11 ......... ) 38 # Landelies Lime- doe/odoti, pl. iv, fig. 10 .[ t Ampsin ......... 36 stone ......... pl. v, figs. 1 a & I b ......... II Avoenoe ......... 38 Various 257 .... ~e~u/are .................. I I Carboniferous ~b~/~ophyllum ~9'o~, pl.it Limestone ... xxi, figs. [I--16 .................. Various ......... 264-68 0, pl. v, fig. 4 ........... MMlieue ......... 4O sp., pl. v, fig. Vis6 ............... 41 Iamdelies Lime- mieulare, pl. v, fig. 3 ...... stone ......... Laadelies ...... 39 tran~itorium, see Uanin~ r mut. K. Lit~ostrotio~ astroides, pl. xxi, fig. 2 ........................... Pinega ............ 259 eraarciatum, pl. xxi, fig. 1. Boroviehi ...... 257 mammillare ............... Priksha ......... 258 I~,~laleia bron~i ............... Various ......... 256 Carboniferous :caledonia, sp. nov., pl. Limestone ... xviii, figs. 11-13 ............ Various ......... 245 cTa~/vo~u~, see L. flor/- f~mis ........................... Various ........ 260 duplieata alstonen~d~, pl. xvii, figs. 5-24 ............... Alston ............ 241 FO88IL$ FIOURBD AND Dm~JglBWD. , vii Name of Speeies. Formation. I Locality. [Page ZOA~rHAmA (continued). Lonsda/e/a d~g/~z~ du/g/- Carboniferous ~ta, pl. xvii, figs. 1-4 ...... Limestone ... Various ......... 238 melmerb/en~, pl. Melmerby Scar