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B Vol. LXXXVI, No. 341. PXRT 1. THB QUARTERLY JOURNAL OF THE GEOLOGICAL SOCIETY. EDITED BT THE PERMANENT SECRETARY. API~IL 23rd, 1930. [With Fourteen Plates, illustrating Papers by Dr. G. H. Mitchell, Dr. H. Bolton, Mr. R. W. Pocock, Mr. R.D. 01dham, and Major A. R. Dwerryhouse & Mr. A. A. Miller.] LONDON : LONGMANS, GREEN, & CO. LTD. PAR1S:--CHARLES KLINCKBIECK, 1l RUE DE LILLE. SOLD ALSO AT THE APARTMENTS OF THE SOCIETY. Price Se~'en SMllings and Sixpence. LIST OF THE OFFICERS AND COUNCIL OF THE GEOLOGICAL SOCIETY OF LONDON. Elected February 21st, 1930. Prof. Edmund Johnston Garwood, M.A., Sc.D., F.R.S. James Archibald Douglas, lVI.A' D.Sc. i Robert Stansfield Herries, M.A. Prof. John Walter Gregory, LL.D., i Prof. William Whitehead Watts, LL.D., D.Sc., F.R.S. ! Se.D., ~I.Sc., F.R.S. ~ttrttartt~. Walter Campbell Smith, M.0., T.D., M.A. t Prof. William Thomas Gordon, M.A., I D.Sc., F.R.S.E. ~orti~n bttrttar,. ~rta~urtr. Sir Arthur Smith Woodward, LL.D., Frederick Noel Asheroft, M.A., F.O.S. F.R.S., F.L.S. Frederick Noel Ashcroft, ]V[.A., F.C.S. ! Finlay Lorimer Kitchin, ~/I.A., Sc.D., Prof. Percy George Hamnall Boswell, I Ph.D., F.R.S. D.Sc., A.R.C.S., D.I.C. Sir Albert Ernest Kitsch, C.M.G., C.B.E. Prof. Charles Gilbert Cullis, D.Sc. James Romanes, M.A. Ernest Edward Leslie Dixon, B.Sc. Bernard Smith, I~.A., Sc.D. James Archibald Douglas, M.A., D.Sc. Walter Campbell Smith, lVI.C., T.D., M.A. Prof. Edmund Johnston Garwood, M.A., Prof. Henry Hurd Swinnerton, D.Sc. Se.D., F.R.S. Herbert Henry Thomas, M.A., Sc.D., Prof. Albert Gilligan, D.Sc., B.Sc. F.R.S. Prof. William Thomas Gordon, lVLA., Cecil Edgar Tilley, Ph.D., B.Sc., A.I.C. D.Se., F.R.S.E. Prof. William Whitehead Watts, LL.D., John Frederick Norman Green, B.A. Sc.D., M.Sc., F.R.S. Prof. John Walter Gregory, LL.D., D.Sc., Leonard Johnston Wills, M.A., Sc.D., F.R.S. Ph.D. Leonard Hawkes, D.Sc. Sir Arthur Smith Woodward, LL.D., Robert Stansfield Herries, iY[.A. F.R.S., F.L.S. ~trmantnt Dttrttar~. L. L. Belinfante, M.Se. ~.ibrarian. ~i~tant ~ibrarfan. Arthur Greig. Norman E. Pettitt. STANDING PUBLICATION COMMITTEE. Prof. E. J. Garwood, President. lVIr. W. Campbell Smith. ] Prof. W. T. Gordon. j Secretaries. Mr. F. N. Ashcroft, Treasurer. Prof. P. G. H. Boswell. Dr. Herbert H. Thomas. Dr. L. J. Wills. Dr. J. A. Douglas. Dr. C. E. Tilley. Sir Arthur Smith Prof. J. W. Gregory. Prof. W. W. Watt~. Woodward. ORDINARY MEETINGS OF THE GEOLOGICAL SOCIETY TO BE HELD AT BURLINGTON HOUSE. SESSlO~ 1929-1930. 1930. Wednesday, April .................................... 30 ,, May .................................... 14~--28 June .................................... 11~--25 ~ [The asterisks denote the dates on which the Commil will meet.] PETROGRAPHIC METHODS AND TYPE AMMONITES. By S. S. BUCKMAN. CALCULATIONS. By Prof. AR'rHUR The publication of this work has been HOLMES, D.Sc., A.R.C.S., D.I.C., F.G.S. taken over by THO.~IAS I%[URBY ~ CO. Second impression. The printing of this Parts LXXI-LXXI[ (combined) which impression (due to the continued demand complete the work are now ready. :Editorial for this book) has made possible a Note, Tables and Index by A. M. DAVIES, aonsiderable reduction in price. 15s. net. D.Se. 20s. net. Postage 4d. Postage : inland Od., ioreign 10d. Vols. I-VII complete ~96 net. HANDBOOK OF THE GEOLOGY O17 GREAT BRITAIN Edited by J. W. EVANS, C.B.E., D.Sc., F.R.S., and C. J. STUBBLEI~IBLD,Ph.D. Contributors. P. G. H. BOSWELL, D.Sc. P. F. KENDALL, D.Sc., F.R.S. A. MORLEY DAVI~S, D.Sc. J. PARKINSON, Sc.D. C. DAVlSON, Sc.D. G. H. PLYMEN, Ph.D. H. I)EwEY. LINSVAT.L RICRntDSON, F.R.S.E. J. W.'EvANS, C.B.E., I).Sc., F.R.S. (~. SLATER, D.Sc. E. J. GARWOOD, So.I)., F.R.S. H. C. V~RSV.y, D.Sc. J. W. GXEGORY, I).Sc., F.R.S. W. W. WATTS, Sc.D., F.R.S. A. HARKER, F.R.S. W. B. WRIGHT, Sc.D. O. T. Josv.s, D.Sc., F.R.S. xii+556 pp. Cr. 4to. Tables, Ilhstrations & Maps. 24s. net. Postagegd. ComTanion Volume ou Ireland. 8s. 6d. net. Postage 5d. METHODS IN GEOLOGICAL SUR- LIMESTONES. By F. J. NORTH, I).Sc., VEYING. By Dr. E. GREENLY and F.G.S., Keeper iu the Department of Dr. HOWEL WILLIAMS. 17~. 6d. net. Geology, National Museum of Wales. Postage : inland 9d., foreign 10d. In the _Press. T. MURBY & CO., 1 Fleet Lane, LONDON, E.C. 4. MACMILLAN Second Edition Just Published. MINERALOGY An Introduction to the Scientific Study of Minerals. By Sir HELOTRY A. MIERS, D.Sc., F.R.S. Second Edition, revised by H. L. Bow~a2¢, D.Sc., Waynflete Professor of Mineralogy in the University o~ Oxford. With 761 Illustrations in the Text. 30s. net. BULLETI~Y 01~ THE IMPERIAL INSTITUTE.--"The book has been completely revised and brought up to date, the mo-t notable addition being two valuable chapters, comprising twenty-six pages with twenty-nine text diagrams, on theories of crystal structure and the investigation of crystal structure by means of X-rays. This is one of the best elementary accounts of the intimate structure of crystals to be found iu an :English introductory text-book on mineralogy." STRATIGRAPHICAL PALZEONTOLOGY A Manual for Students and Field Geologists. :By E. NE2LVEt~SON, 1).Sc., Demonstrator and Lecturer in Pal~contology, University of Liverpool. Illustrated. 18s. net. HATURE.--" This is an excellent book, and one that fills what has hltherto been a distinct gap in British ~eologieal literature .... The volume is well illustrated and contains about 500 excellent figures of xossils, mostly of zonal value .... We heartily commend this volume to the student and to the general reader." * Detailed Prospectuses post free on application. MACMILLAN & CO., LTD., LONDON, W.C. 2. CONTENTS. Pages Proceedings of the Geological Society ................................................ i-xlviii PAPERS READ. Page 1. Dr. G. H. Mitchell on the Petrography of the Borrowdale Volcanic Series of Kentmere, Westmorland (Plate I) ................................................... 1 2. Dr. H. Bolton on the Fossil Insects of the South Wales Coalfield (Plates II-V) 9 3. Mr. R. W. Pocock on the Peta~ocrinus Limestone Horizon at Woolhope, Herefordshire (Plates VI & VII) ................................................... 50 4. Mr. R. D. Oldham on Historic Changes of Level in the Del~ of the Rh6ne (Plate VIII) .............................................................................. 64 5. Mr. C. J. Gilbert on Earth-Movements during the Closing Stages of the Neolithic Depression .................................................................. 94 6. Major A. R. Dwerryhouse & Mr. A. A. Miller on the Glaciation of Clun Forest, Radnor Forest. and some Adjoining Districts (Plates IX-XIV) .. 96 [The Editor of the Quarterly Journal is directed to make it known to the Publi~ that the Authors alone are responsible for the facts and opinions contained in their respective Papers, and for the correctness of their references.] Authors desirous of communicating papers to the Society will be supplied, o~ vpplication to the Permanent Secretary, with a copy of 'Instructions to Authors', issued by the Council on the recommendation of the Publication Committee. The Library at the Apartments of the Society is open every Week Day from Ten o'clock until Five, except on Saturdays (when the hours are from 10 to 1). B m Vol. LXXXVI, N0, 3,4a. PA~T 2. THE Q.UA I(X E R I,Y ,JO U R N A L OF THE GEOI,()GICAI, SOCIETY. EDITED BY THE PERMANENT SECRETARY JULY 3lst, 1930. [With Fifteen Plates, illustrating Papers by Dr. C. A. Matley & Dr. A. Heard, Dr. David Williams, Mr. H. P. Lewis, and Dr. Stanley Smith.] LONDON : LONGMANS, GRFEN, & CO. LTD. PARIS:--CHARLES KLtNCKSIECK 1[ RU ~, DE LILLE. SOLD ALSO AT THE APARTIKENTS OF TIIE SOCIETY Price Seren Shillings and Sixpence. m LIST O~ THE OFFICERS AND COUNCIL OF TIlE GE()I,()GICAL S()CIETY OF I ()NDON. Elected February 21st, 1930. ~rt~i~tnt. Prof. Edmund Johnston Garwood, M.A., Se.D., F.R.S. James Archibald Douglas, M.A., D.Se. Robert Stansfield Herries, M.A. Prof. John Walter Gregory, LL.D., Prof. William Whitehead Watts, LL.D., D.Sc., F.R.S. Sc.D., M.Sc., F.R.S. ~ttrttarit~. Walter Campbell Smith, M.O., T.D., M.A. ] Prof. William Thomas Gordon, M.A., I D.Se., F.R.S.E. ~ortigll bttrttarl2. ~ rta~urtr. Sir Arthur Smith Woodward, LL.D., Frederick Noel Asheroft, M.A., F.C.S. F.R.S., F.L.S. Frederick Noel Ashcroft, M.A., F.C.S. Finlay Lorimer Kitchin, ]VI.A., Sc.D., Prof. Percy George Hamnall Boswell, Ph.D., F.R.S. D.Se., A.R.C.S., D LC. Sir Albert Ernest Kitson, C.M.G., C.B.E. Prof. Charles Gilbert Cullis, D.Sc. James Romanes, M.A. Ernest Edward Leslie Dixon, B.Sc. Bernard Smith, M.A., Sc.D. James Archibald Douglas, M.A., D.Sc. Walter Campbell Smith. hi .C.. T.D., M.A. Prof. Edmund Johnston Garwood, M.A., Prof. Henry Hurd Swinnerton, D.Uc. Sc.D., F.R.S. Herbert Henry Thomas, M.A., Sc.D., Prof. Albert Gilligan, D.Sc., B.Sc. F.R.S. Prof. William Thomas Gordon, M.A., Cecil Edgar Tilley, Ph.D., B.Se., A.I.C. D.Sc., F.R.S.E.