Price Five,~hilling~.

Transcription

1 ." i. bm..~ II Vol. LXXlII. PA~T 1. No. Q89. THE QUARTERLY JOURNAL OF THE GEOLOGICAL SOCIETY. THE PERMANENT SECRETARY. [With Four Platea, illustrating Paperm by Dr. A. S. Woodward and Prof. H. H. Swinnerton & Mr. A. E. Traeman.] A~aIL 6th, LONDON : LONGMANS, GREEN, AND CO. PARI~:--CHARLISS KLII~CKSIECK, 11 RUE DE LILLE. 8OLD ALSO.aT THE APART.HENTS OF THE SOCIETY. Price Five,~hilling~.

2 LIST OF THE OFFICERS AND COUNCIL OF THE GEOLOGICAL SOCIETY OF LONDON. Elected February 15th, Prt~i~tnt. George William Lamplugh, F.R.S. ~ itt-- 7~rt~ffJ tnt~. R. Mountford Deeley, M.Inst.C.E. [ Prof. William Johnson Sollas, M.A., Alfred Harker, M.A., 1 So.D, Sir Jethro J. Harris Tea]l, M.A., D.So., btfrttarit~. Herbert Henry Thomas, M.A., Sc.D. I Herbert Lapworth, D.Sc., M.Inst.C.E. ~ortign btctttarp. ~rta~urtr. SirArehlbald Geikie, O.M., K.C.B., D.C.L., I James Vincent Elsden, D.So. LL.D., Sc.D., F.R.S. } C@~N@ L. Charles William Andrews, D.Sc., F.R.S. Herbert Lapworth, D.Sc., M.Inst.C.E. Francis Arthur Bather, M.A., D.Sc., F.R.S., Major Henry George Lyons, D.Sc., F.R.S. Prof. John Cadman, C.M.G.,D.Sc., M.Inst.! Prof. John Edward Marr, M.A., So.D, C.E. F.R.S. Arthur Morley Davies, D.Sc., A.R.C.Sc. Richard Dixon Oldham, F.R.S. R. Mountford Deeley, M.Inst.C.E. Robert Heron Rastall, M.A. James Vincent Elsden, D.Sc. Prof. William Johnson Sol]as, M.A., So.D, Prof. Edmund Johnston Garwood, M.A.~ Sc.D., F.R.S. Prof. Henry Hurd Swinnerton, D.Sc. Sir Archibald Geikie, O.M., K.C.B., D.C.L., Sir Jethro J. Harris Teall, M~., D.So, LL.D., Sc.D.. F.R.S. John Frederick Norman Green, B.A. Herbert Henry Thomas, M.A., Sc.D. Alfred Harker, M.A., Samuel Hazzledine Warren. Finlay Lorimer Kitchin, M.A., Ph.D. Prof. William Whitehead Watts, M.A., George William Lamplugh, F.R.S. So.D, Dr. F. A. Bather. Prof. J. Cadman. Mr. R. M. Deeley. Dr. J. V. Elsden. Prof. E. J. Garwood. Pttmantnt ~ t~rtta;~. L. L. Belinfan~, M.Sc. Kibrarian. C. P. Chatwin. ~ltrk. M. St. John Hope. ~e~i~tant m ~ibrarv. Arthur Greig. STANDING PUBLICATION COMMITTEE. Mr. G. W. Lamplugh, President. Dr. H. Lapworth. Dr. Herbert H. Thomas. Secretaries. Mr. J. F. N. Green. Dr. F. L. Kitchin. Major H. G. Lyons. Mr. R. D. Oldham. ) Prof. W. J. Sol]as. Sir Jethro Teail. Mr. S. H. Warren. Prof. W. W. Watts. ORDINARY MEETINGS OF THE GEOLOGICAL SOCIETY TO BE HELD AT BURLINGTON HOUSE. S~,sszo~ ' Wednesday, April #,, May # June... 5m19 # [B~s wi~ eom/me~,ws at 5.30 p.m. pre~sdy.] The asterisks denote the dates on which the Council will meet.

3 ADMISSION AND PRIVILEGE8 OF FELLOWS OF THE GEOLOGICAL SOCIETY OF LONDON. EVIRY Candidate for admission as a Fellow must be proposed by throe or more Fellow, who must sign a Cer~cate in his favour. The Proposer whose name stands first upon the Certificate must have a personal knowledge of the Candidate.L Fellows on election pay an Admission Fee of Six Guineas. The Annual Coni~bu- ~on paid by Fellows is Two Guineas, due on the 1st of January in every year, and payable in advance ; but Fellows elected in November or December pay no Contribution for the current year. The Annual Contribution may, at any ~me, be compounded for by a payment of Thirty-Five Pounds. The Fellows are entitled to receive gratuitously all the volumes or parts of volumas of the Quarterly Journal of the Society that may be published after t~heir election, ~o long as their Annual Contributions are paid ; and they may purchase any of the publications of the Society at a reduction of 25 per cent. under the selling-prices. The Library is open on Week Days to the Fellows between the hours of 10 and 5 (except on Saturdays, when the hours are from 10 to 1, and except during the fortnight commencing on the first Monday in September; see also next page). Under certain restrictions, Fellows are allowed to borrow books from the Library. Publications to be had of the Geological Society, Burlington House. QUARTERLY JOURNAL. (Vols. Ill to LXXH, inclusive.) Price to Fellows, d. each (Vols. XV, XXIII, XXX, and XXXIV to LIXII, 16s. 6d.), in cloth. GENERAL INDEX TO THE FIRST FIFTY VOLUMES OF THE QUARTERLY JOURNAL ( ). Part I (A-La). Part H (La-Z). Price 5s. each. To Fellows 38. 9d. each. [Postage 3d.] GEOLOGICAL LITERATURE added to the Geological Society's Library during the years ended December Slst, Pries 2e. each. To Fellows, ls. 6d. ~ch. [Postage 3d.] THE HISTORY OF THE GEOLOGICAL SOCIETY OF LONDON, by H. B. WOODWARD, F.R.S. Price 7s. 6d. To Fellows, 6s. [Postage 6~.~ THE CENTENARY' OF THE GEOLOGICAL SOCIETY OF LONDON, recorded by W. W. WATTS, F.R.S. Price 2s. net. [Postage 3d.] HUTTON'S 'THEORY OF THE EARTH,' Vol. III, edited by Sir ARCHIBALDGEIKIE, D.C.L., F.R.S. Price 3s. 6d. To Fellows, 2s. [Postage 4~.] THE GEOLOGY OF NEW ZEALAND. Translated by Dr. C. F. FISCHER from the works of MM. HOCHSTETTER-~ ]~TERMANN. With an At]u of Six Maps. Fellows may purchase one Copy of t~ais Book at ~. Additional Copiu ~11 be charged 4e. [PosSe 5d.]

4 CONTENTS. Pages Proceedings of the Geological Society, Session , including the Proceedings at the Annual General Meeting, the President's Anniversary Address, etc... i-cii PAPERS READ. Page 1. Dr. A. Smith Woodward on a Second Skull from the Piltdown Gravel. (Plate I). With an Appendix by Prof. G. Elliot Smith ~r. H. C. Sargent on Lower Carboniferous Spilites from Derbyshire Prof. H. H. Swinnerton & I~Ir. A. E. Trueman on the Morphology and Development of the Ammonite Septum (Plates II-IV) [The Editor of the Quarterly Journal is directed to ma.~e it known to the Public that the Authors alone are responsible for the facts and opinions contained in their respective Papers.] ~.o The Council request that all communications intended for publication by the Society shall be clearly and legibly written on one side of the paper only, with proper references, and in all respects in fit condition for being at once placed in the Printer's hands. Unless this is done, it will be in the discretion of the Officers to retnrn the communication to the Author for revision. The Library at the Apartments of the Society is open every Week Day from Ten 4 o'clock un~il Five, except on Satnrdays (when the hours are from 10 to 1), and except during the fortnight commencing on the first Monday in September, when the Library is closed for the purpose of cleaning.

5 O4~, Vol. LXXnL No PART 2. THB QUARTERLY JOURNAL OF THE GEOLOGICAL SOCIETY. BDITJD BY THE PERMANENT SECRETARY. i:with Twelve Plates, illustrating Papers by Mrs. Longstaff, Mr. L. M. Parsons, and Mr. F. Dixey & Prof T, F. Sibly.] AUOUST 20th, LONDON. LONGMANS, GREEN, AND CO. PARIS:--CHA]LLF~ KLINCK6IXCK, 11 RUB D! T, Tlr,T,R_ BOLD L80 AT M AFARTMENTB OF THB $OOIBTY. Pries Five 8billings.

6 LIS'P OF THI~ OFFICERS AND COUNCIL OF THE GEl)LOGICAL S )CIETY OF LONDON. Elected February 15th, ~rtgi~tnt. George William Lampl.ugh, F.R.S. ~itt-~jrt~iljtnt~. R. Mountford Deeley, M.Inst.C.E. Prof. William Johnson Sollas, M.A., Alfred Harker, M.A., So.D, Sir Jethro J. Harris Teall, M.A., D.So., bttrttarit~. Herbert Henry Thomas, M.A., Sc.D. [ Herbert Lapworth, D.Sc., M.Inst.O.E. ~ortign bttrtta~. ~rta~urtr. SirArehihald Geikie, 0.M., K.0.B., D.C.L., [ James Vincent Elsden, D.Sc. LL.D., So.D, F.R.S. I ~ ~t:gl. Charles William Andrews, D.Sc., F.R.S. Francis Arthur Bather, M.A., D.Sc., F.R.S. Prof. John Cadman, C.M.G.,D.Sc., M.Inst. C.E. Arthur Morley Davies, D.Sc., A.R.C.Sc. R. Mounfford Deeley, M.Inst.C.E. James Vincent Elsden, D.Sc. Prof. Edmund Johnston Garwood, M.A., So.D, F.R.S. Sir Archibald Geikie, O.M., K.C.B., D.C.L., LL.D., So.D.F.R.S. John Frederick Norman Green, B.A. Alfred Harker, M.A., Finlay Lorimer Kitchln, M.A., Ph.D. George William Lamplugh, F.R.S. Ptrmantnt ~ tfrtta~. L. L. Belinfante, M.Sc. Kibrarian. C. P. Chatwin. ~Itrk. M. St. John Hope. ~e~i~tant in ~.ibrat~. Arthur Greig. Herbert Lapworth, D.So., M.Inst.C.E. Major Henry George Lyons, D.Sc., F.R.S. Prof. John Edward Mart, M.A., So.D, F.R.S. Richard Dixon Oldham, F.R.S. Robert Heron Rast~ll, M.A. Prof. William Johnson Sollas, M.A., Sc.D., Prof. Henry Hurd Swinnerton, D.So. Sir Jethro J. Harris Teall, M~., D.So, Herbert Henry Thomas, M.A., So.D. Samuel I~azzledine Warren. Prof. William Whitehead Watts, M.A., So.D, STANDING PUBLICATION committee. Mr. G. W. Lamplugh, Pre~nt. Dr. H. Lapworth. ] Dr. Herbert H. Thomas. S 8ecretari~. Dr. F. A. Bather. Prof. J. Cadman. Mr. R. M. Deeley. Dr. J. V. Elsden. Prof. E. J. Gal~ood. Mr. J. F. N. Green. Dr. F. L. Kitchin. Major H. G. Lyons. Mr. R. D. Oldham. Prof. W. J. Sollu. Sir Jethro Teall. Mr. S. H. Warren. Prof. W. W. Watts. ORDINARY MEETINGS OF THE GEOLO{}ICAL S O C ~ TO BE HELD AT BURLINGTON HOUSE. S~ssio~ Wednesday, November... 6#--20,, December # 1919.,. January... 8#--22 #,, February (Ann~cd Meeting, Friday, February 21st). 5#--26 #,, March #,, April... 9 #,, May #,t June # [ B~s4m~s to~ commetwe at 5.30 p.m. prec/sdy.] The asterisks denote the dates on which the Council will meet.

7 FELLOWS ADMISSION AND PRIVILEGES OF OF THE GEOLOGICAL SOCIETY OF LONDON. Ev~nY Candidate for admission as a Fellow must be proposed by three or more Fellows, who must sign a Certificate in his favour. The Proposer whose name stands first upon the Certificate must have a personal knowledge of the Candidate. Fellows on election pay an Admission Fee of Six Guineas. The Annual Contribution paid by Fellows is Two Guineas, due on the 1st of January in every year, and payable in advance ; but Fellows elected in November or December pay no Contribution for the current year. The Annual Contribution may, at any time, be compounded for by a payment of Thirty-Five Pounds. The Fellows are entitled to receive gratuitously all the volumes or parts of volumes of the Quarterly Journal of the Society that may be published after their election, so long as their Annual Contributions are paid ; and they may purchase any of the publications of the Society at a reduction of 25 per cent. under the selling-prices. The Library is open on Week Days to the Fellows between the hours of 10 and 5 (except on Saturdays, when the hours are from 10 to 1, and except during the fortnight commencing on the first Monday in September; see also next page). Under certain restrictions, Fellows are allowed to borrow books from the Library. Publications to be had of the Geological Society, Burlington House. QUARTERLY JOURNAL. (Vols. HI to LXXH, inclusive.) Price to Fellows, 13s. 6d. each (Vols. XV, XXIII, XXX, and XXXIV to LXXI[, 16s. 6d.), in cloth, i GENERAL INDEX TO THE FIRST FIFTY VOLUMES OF THE QUARTERLY JOURNAL ( ). Part I (A-La). Part H (L~-Z). Price 5s. each. To Fellows 3a. 9d. each. [Postage 3d.] GEOLOGICAL LITERATURE added to the Geological Society's Library during the years ended December 31st, Price 28. each. To Fellows, Is. 6d. ~ch. [Postage 3d.] THE HISTORY OF THE GEOLOGICAL SOCIETY OF LONDON, by H. B. WOODWARD, F.R.S. Price 78. 6d. To Fellows, 6e. EPostage 6d.] THE CENTENARY OF THE GEOLOGICAL SOCIETY OF LONDON, recorded by W. W. WATTS, F.R.S. Price 2s. net. [Postage 3d.] HUTTON'S 'THEORY OF THE EARTH,' Vol. HI, edited by Sir ARCHIBALD GEIKII, D.C.L., F.R.S. Price 3s. 6d. To Fellows, 2s. [PosSe 4,1.] THE GEOLOGY O~' NEW ZEALAND. Translated by Dr. C. F. FISCHER from the works of M~M. HOCHSTITTER & PETERMAN~. With an Atlu of Six Maps. Fellows may purchase one Copy of tj~is Book at 2s. Additional Copi~ be chareed 4e. [Postage ~.]

8 CONTENTS. PAPERS READ. Page 4. Mrs. Longstaff on Ac~ and Ac~oi0~ (Plates V & YI) Mr. L. M. Parsons on the Carboniferous Limestone bordering the Leicestershire Coalfield (Plates VII-XI) Mr. F. Dixey & Prof. T. F. Sibly on the Carboniferous Limestone Series on the South-Eastern Margin of the South Wales Coalfield (Plates XII- XYI) [The Editor of the Quarterly Journal is directed to make it known to the Public that the Authors alone are responsible for the facts and opinions contained in their respective Papers.] o#e The Council request that all communications intended for publication by the Society shall be clearly and legibly written on one side of the paper only, with proper references, and in all respects in fit condition for being at once placed in the Printer's hands. Unless this is done, it will be in the discretion of the O~oers to return the communication to the Author for revision. The Library at the Apartments of the Society is open every Week ~)ay from Ten o'clock until Five, except on Saturdays (when the hours are from'lo to 1), and except during the fortnight commencing on the first Monday in September, when the Library is closed for the purpose of cleaning. The Secretaries of the Society are desirous of completing a record of the services rendered by the Fellows in connexion with the present War. Details of service, with a statement of rank, regiment, military honours, and any other information, will be gladly received from Fellows, either with reference to themselves or to those known to them.

9 Q::::I ::ii:i; ~i~ii i? iiii?i ii~ii...? :ii~:::ii :B Vol. LXXIII. No. o91. PART 3. THE QUARTERLY JOURNAL OF THE GEOLOGICAL SOCIETY. THE PERMANENT SECRETARY. [With Nine Plates, illustrating I)r. C. T. Trechmann's Paper.] NOVEMBER 30th, LONDON. LONGMANS, GREEN, AND CO. PARI~:--CHARLES KLINCKSIECK. 11 RUE DE LILLE SOLD ALSO AT THE APART,~,IENTS OF THE 5OCIETY. Price Five Shillings.

10 LIST OF THE OFFICERS AND COUNCIL OF THE GE()LOGICAL SOCIETY OF LONDON. Elected February 15th, ~rt~i~rnt. George William Lamp!ugh, F.R.S. ~Fitt--~rt,i~tnt~. R. Mountford Deeley, M.Inst.O.E. Prof. William Johnson Sollas, M.A., Alfred Harker, M.A., i Se.D., Sir Jethro J. Harris Teal], M.A., D.So., ~ttrttarit~. Herbert HenryThomas, M.A., Sc.D. Herbert Lapworth, D.Sc., M.Inst.C.E. ~[Fortifln bttrttarp. ~rta~urtr. SirArohibald Geikie, O.M., K.C.B., D.C.L., James Vincent Elsden, D.Sc. LL.D., Sc.D, F.R.S. ~NCOL. Charles William Andrews, D.Sc., F.R.S. Francis Arthur Bather, M.A., D.Sc., F.R.S. Prof. Sir John Cadman, K.C.M.G., D.Sc., M.Inst~. C.E. Arthur Morley Davies, D.Sc., A.R.C.S0. R. Mountford Deeley, M.Inst.C.E. James Vincent Elsden, D.Sc. Prof. Edmund Johnston Garwood, M.A., Sc.D., F.R.S, Sir Archibald Geikie, 0.M., K.C.B., D.C.L., LL.D., Sc.D.. F.R.S. John Frederick Norman Green, B.A. Alfred Harker, M.A., Finlay Lorimer Kitchin, M.A., Ph.D. George William Lamplugh, F.R.S. i Prcmantnt Dttrttar~. L. L. Belinfante, M.Se. ]Librarian. C. P. Chatwin. Chdt. M. St. John Hope. ~le~i~tant in ] ibra~. Arthur Greig. Herbert Lapworth, D.Sc., M.Inst.C.E. Lt.-Col. Henry George Lyons,D.Sc.,F.R.S. Prof. John Edward Mart, M.A., Sc.D., F.R.S. Richard Dixon Oldham, F.R.S. Robert Heron Rastall, M.A. Prof. William Johnson Sollas, M.A.,Sc.D., Prof. Henry Hurd Swinnerton, D.Sc. Sir Jethro J. Harris Teall, M.A., D.Sc, Herbert Henry Thomas, M.A., Sc.D. Samuel Hazzledine Warren. Prof. William Whitehead Watts, M.A., Sc.D, LL.D., F.R,S. STANDING PUBLICATIO:SI COMMIrPTEE. Mr. G. W. Lamplugh, President. Dr. H. Lapworth. Dr. Herbert H. Thomas. J Secretaries. Dr. F.,3.. BatJaer. Mr. J. F. N. Green. Prof. W. J. Sollas. Prof. Sir John Cadman. Dr. F. L. Kitchin. Sir Jethro TeaU. Mr. R. M. Deeley. Lt.-Col. H. G. Lyons. Mr. S. H. Warren. Dr. J. V. Elsden. Mr. R. D. Oldham. Prof. W. W. WaiVe. Prof. E. J. Garwood. ORDINARY MEETINGS OF THE GEOLOGICAL SOCIETY TO BE HELD AT BURLINGTON HOUSE. SEssIo Wednesday, December * 1919.,, January... 8"--22 ~,, February (Annu~t Meeting, Friday, February 21st). 5"--26 *,, March ",, April... 9*,, May w June ~ [Bummers wilt convmence at 5.80 p.m. precisety.] The astmrisks denot~ the dates on which the Council will meet~

11 ADMISSION AND PRIVILEGES OF FELLOWS OF THE GEOLOGICAL SOCIETY OF LONDON. E very Candidate for admission as a Fellow must be proposed by three or more Fellows, who must sign a Certificate in his favour. The Proposer whose name stands first upon the Certificate must have a personal knowledge of the Candidate. Fellows on election pay an Admission Fee of Six Guineas. The Annual Contribution paid by Fellows is Two Guineas, due on the 1st of January in every year, and payable in advance ; but Fellows elected in November or December pay no Contribution for the current year. The Annual Contribution may, at any time, be compounded for by a payment of Thirty-Five Pounds. The Fellows are entitled to receive gratuitously all the volumes or parts of volumes of the Quarterly Journal of the Society that may be published after their election, so long as their Annual Contributions are paid ; and they may purchase any of the publications of the Society at a reduction of 25 per cent. under the selling-prices. The Library is open on Week Days to the Fellows between the hours of 10 and 5 (except on Saturdays, when the hours are from 10 to 1, and except during the fortnight commencing on the first Monday in September, see also next page). Under certain restrictions, Fellows are allowed to borrow books from the Library. Publications to be had of the Geological Society, Burlington House. QUARTERLY JOURNAL. (Vols. III to LXXII, inclulive.) Price to Fellows, d. each (Vols. XV, XXIII, XXX, and XXXIV to LXXII, 16s. 6d.), in cloth.] GENERAL INDEX TO TI-IE FIRST FIFTY VOLUMES OF THE QUARTERLY JOURNAL ( ). Part I (A-La). Part H (La~-Z). Price 58. each. To Fellows 3.~. 9d. each. [Postage 3d.] QEOLOGICAL LITERATURE added to the Geological Society's Library during the years ended December 31st, Price 2s. each. ToFellows, ls. 6d. e~ch. [Postage 3d.~ THE HISTORY OF THE GEOLOGICAL SOCIETY OF LONDON, by H. B. WOODWARD, F.R.S. Price 7s. 6d. To Fellows, 68. [Postage 6d.] THE CENTENARY OF THE GEOLOGICAL SOCIETY OF LONDON, recorded by W. W. WATTS, F.R.S. Price 2s. net. [Postage 3d.] HUTTON'S 'THEORY OF T~IE EARTH,' Vol. ILI, edited by Sir ARCHIBALD GEIKIE, D.C.L,, F~R.S. Price 3s. 6d. To Fellows, 2s. [Postage 4d.] THE GEOLOGY OF NEW ZEALAND. Translated by Dr. C. F. FISCHIR from the works of MM. HOCHSTETTER & PETERMANN. With an Atlas of Six Maps. Fellows may purchase one Copy of ~fis Book at 2s. Additional Copies will be charged 48. [Postage 5d.]

12 CONTENTS. PAPERS READ. 7. Dr. C. T. Trechmann on the Trias of New Zealand (Plates XVII-XXV).. P~.ge Dr. F. A. Bather on Triassic Crinoids from New Zealand [The Editor of the Quarterly Journal is directed to make it known to the Public that the Authors alone are responsible for the facts and opinions contained in their respective Papers.] **~ The Council request that all communications intended for publication by the Society shall be clearly and legibly written on one side of the paper only, with proper references, and in all respects in fit condition for being at once placed in the Printer's hands. Unless this is done, it will be in the discretion of the Officers to return the communication to the Author for revision. 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), and except during the fortnight commencing on the first Monday in September, when the Library is closed for the purpose of cleaning. The Secretaries of the Society are desirous of completing a record of the services rendered by the Fellows in connexion with the present War. Details of service, with a statement of rank, regiment, military honours, and any other information, will be gladly received from Fellows, either with reference to themselves or to those known to them.

13 Vol. LXXIIL PART 4. No. THE QUARTERLY JOURNAL OF THE GEOLOGICAL SOCIETY. EDITED BY THE PERMANENT SECRETARY. [With Five Plates, illustrating Mr, S. S. Buckmau's Paper.] DECEMBER 31St, LONDON : LONGMANS, GREEN, AND CO. I ml- PARI~:--CHARLES KLINCKSIECK, 11 RUE DE LILLE. SOLD ALSO AT THE AI'ARTMEET8 OF THE ~OCIETY. / Price Five,~hilling~." t

14 LISI ~ OF THE OFFICERS AND COUNCIL OF THE GE()LOGICAL SOCIETY OF L(INDON. Elected February 15th, ~rt~i~tnt. George William Lamplugh, F.R.S. ~itt--~rt~i~tnt~. R. Mountford Deeley, M.Inst.C.E. I Prof. William Johnson Sollas, M.A., Alfred Harker, M.A., I Sc.D., I Sir Jethro J. Harris Tea[l, M.A., D.Sc, ~ttrttarit~. Herbert Henry Thomas, M.&., So.D. Herbert Lapworth, D.Sc., M.Inst.O.E. dfartistn bttrttar~. Sir Archibald Geikie, O.M., K.O.B., D.0.L., LL.D., Se.D., F.R.S. Charles William Andrews, D.Sc., F.R.S. Francis Arthur Bather, M.A., D.Sc., F.R.S. Prof. Sir John Cadman, K.C.M.G., D.Sc. M.Inst. C.E. Arthur Morley Davies, D.Se., A.R.C.Sc. R. Mountford Deeley, M.Inst.C.E. James i'~cen~ E!sden, D.Sc. Prof. Edmund Johnston Garwood, M.A. Sc.D., F.R.S, Sir Archibald Geikie, O.M., K.C.B., D.C.L. LL.D., Sc.D.. F.R.S. J ohn Frederick Norman Green, B.A. Alfred Harker, M.A., Finlay Lorimer Ki~chin, M.A., Ph.D. George William Lamplugh, F.R.S. P~rmantnt ~ crtta;'p. L. L. Belinfante, M.Sc. ~ibrarian. C. P. Chatwin. tgltrtt. M. St. John Hope. ~i~i~tant in ~.ibrarj 2. Arthur Greig. ~rta~urtr. James Vincent Elsdon, D.Sc. Herbert Lapworth, D.Sc., M.Inst.C.E. Lt.-Col. Henry George Lyons,D.Sc.,F.R.S. Prof. John Edward Marr, M.A., So.D, F.R.S. Richard Dixon Oldham, F.R.S. Robert Heron Rastall, M.A. Prof. William Johnson Sollas, M.A., Sc.D, Prof. Henry Hurd Swlnner~'on, D.Sc. Sir Jethro J. Harris Teall, M.A., D.Sc, Herbert Henry Thomas, M.A., Sc.D. Samuel Hazzledine Warren. Prof. William Whitehead Watts, M.A., Sc.D., STANDING PUBLICATION COMMITTEE. Mr. G. W. Lamplugh, President. Dr. H. Lapworth. Dr. Herbert H. Thomas. J Secretaries. Dr. F.'~A. Bather. Mr. J. F. N. Green. Prof. W. J. Sollas. Prof. Sir John Cadman. Dr. F. L. Kitehin. Sir Jethro Teall. Mr. R. M. Deeley. Lt.-Col. H. G. Lyons. Mr. S. H. Warren. Dr. J. V. Elsden. Mr. R. D. Oldham. I~'of. W. W. Watts. Prof. E. J. Garwood. ORDINARY MEETINGS OF THE GEOLOGICAL SOCIETY TO BE HELD AT BURLINGTON HOUSE. Swssio~ Wednesday, January... 8*--22 #,, February (Annua~ Meeting, Friday, February 21st). 5#--26 *,, March #,, April... 9*,, May # June # [ Busineg8 wil~ commence at 5.30 p.m. precise~y.] The asterisks denot~ the dates on which flee Council will meet.

15 ADMISSION AND PRIVILEGES OF FELLOWS OF THE GEOLOGICAL SOCIETY OF LONDON. EvErY Candidate for admission as a Fellow must be proposed by three or more Fellows, who must sign a Certificate in his favour. The Proposer whose na~ne stands first upon the Certificate must have a personal knowledge of ~he Candidate. Fellows on election pay an Admission Fee of Six Guineas. The Annual Contribution paid by Fellows is Two Guineas, due on the 1st of January in every year; and payable in advance ; but Fellows elected in November or December pay no Contribhtion for the current year. The Annual Contribution may, at any time, be compounded for by a payment of Thirty-Five Pounds. The Fellows are entitled to receive gratuitously all the volumes or parts of volumes of the Quarterly Journal of the Society that may be published after their election, so long as their.:annual Contributions are paid ; and they may purchase any of the publications of the Society a~ a reduction of 25 per cent. under the selling-prices. The Library is open on Week Days to the Fellows between the hours of 10 and 5 (except on Saturdays, when the hours are from 10 %o 1, and except during the fortmight commencing on the first Monday in September, see also next page). Under certain restrictions, Fellows are allowed %o borrow books from the Library. Publications to be had of the Geological Society, Burlington House. QUARTERLY JOURNAL. (Vols. III to LXXIII, inclusive.) Price fm Fellows, 13s. 6d. each (Vols. XV, XXIII, XXX, and XXXIV to LXXIII, 16s. 6d.), in cloth. GENERAL INDEX TO THE FIRST FIFTY VOLUMES OF TI-IE QUARTERLY JOURNAL ( ). Part I (A-La). Part II (La-Z), Price 5s. each. To Fellows 3s. 9d. each. [Postage 3d.] GEOLOGICAL LITERATURE added to the Geological Society's Library during the years ended December 31st, Price 2s. each. To Fellows, ls. 6d. each. [Postage 3d.] THE HISTORY OF THE GEOLOGICAL SOCIETY OF LONDON, by H. B. WOODWARD, F.R.S. Price 7s. 6d. To Fellows, 6s. [Postage 6d.] THE CENTENARY OF THE GEOLOGICAL SOCIETY OF LONDON, recorded by W. W. WATTS, F,R.S. Price 2s. net. [Postage 3d.] HUTTON'S 'TI-IEORY OF TI-IE EARTH,' Vol. III, edited by Sir At~CHIBALD CTEIKIE, D.C.L., F.R.S. Price 3s. 6d. To Fellows, 2s. [Postage 4d.] THE GEOLOGY OF NEW ZEALAND. Translated by Dr. C. F. FISCHER from the works of MM. HOCHSTETTEB & PETERMANS. With an Atlas of Six Map~. Fellows may purchase one Copy of ~Jais Book at 2s. will be charged 4s. [Postage 5d.] Additional 'Copies

16 CONTENTS. PAPERS REAl). Page 9. Mr. S. S. Buekman on Jurassic Chronology : I--Lias (Plates XXVI-XXXI) Mr. T. H. Burton on the Microscopic Material of the Bunter Pebble-Beds of No~inghamshire [TITLE-PAGE, CONTENTS, and INDEX to Vol. LXXIII.] [The Editor of the Quarterly Journal is directed to make it known to the Public that the Authors alone are responsible for the facts and opinions contained in their respective Papers.] **# The Council request that all communications intended for publication by the Society shall be clearly and legibly written on one side of the paper only, with proper references, and in all respects in fit condition for being at once placed in the Printer's hands. Unless this is done, it will be in the discretion of the Officers ~o retmul the communication to the Author for revision. 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), and except during the fortnight commencing on the first Monday in September, when the Library is closed for the purpose of cleaning. The Secretaries of the Society are desirous of completing a record of the services rendered by the Fellows in connexion with the present War. Details of service, with a statement of rank, regiment, military honours, and any other information, will be gladly received from Fellows, either with reference to themselves or to those known to them.