."°i

. bm..~ II

V o l . L X X l I I . PA~T 1.

No. Q 8 9 .

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, 1918.

LONDON :

LONGMANS, GREEN, AND CO.

P A R I ~ : - - C H A R L I S S K L I I ~ C K S I E C K , 11 RUE DE LILLE.

8 O L D A L S O .aT THE APART.HENTS OF THE S O C I E T Y .

Price Five ,~hilling~.

LIST OF THE OFFICERS AND COUNCIL OF THE

GEOLOGICAL SOCIETY OF LONDON. Elected February 15th, 1918.

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., LL.D., F.R.S. 1 So.D, LL.D., F.R.S.

Sir Jethro J. Harris Tea]l, M.A., D.So., LL.D., F.R.S.

b t f r t t a r i t ~ . Herbert Henry Thomas, M.A., Sc.D. I Herbert Lapworth, D.Sc., M.Inst.C.E.

~ortign b t c t t t a r p . ~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., Prof. John Cadman, C.M.G.,D.Sc., M.Inst.!

C.E. Arthur Morley Davies, D.Sc., A.R.C.Sc. 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, O.M., K.C.B., D.C.L.,

LL.D., Sc.D.. F.R.S. John Frederick Norman Green, B.A. Alfred Harker, M.A., LL.D., F.R.S. Finlay Lorimer Kitchin, M.A., Ph.D. George William Lamplugh, F.R.S.

Major 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 Sol]as, M.A., So.D,

LL.D., F.R.S. Prof. Henry Hurd Swinnerton, D.Sc. Sir Jethro J. Harris Teall, M~., D.So,

LL.D., F.R.S. Herbert Henry Thomas, M.A., Sc.D. Samuel Hazzledine Warren. Prof. William Whitehead Watts, M.A.,

So.D, LL.D., F.R.S.

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.

Dr. F. A. Bather. Prof. J . Cadman. Mr. R. M. Deeley. Dr. J. V. Elsden. Prof. E. J. Garwood.

Mr. G. W. Lamplugh, President. Dr. H. Lapworth. Dr. Herbert H. Thomas. Secretaries.

)

Mr. J. F. N. Green. Prof. W. J. Sol]as. Dr. F. L. Kitchin. Sir Jethro Teail. Major H. G. Lyons. Mr. S. H. Warren. Mr. R. D. Oldham. Prof. W. W. Watts.

O R D I N A R Y M E E T I N G S O F T H E G E O L O G I C A L S O C I E T Y TO BE HELD AT BURLINGTON HOUSE.

S~,sszo~ 1917-1918. ' 1918.

Wednesday, April . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 # ,, May .... . . . . . . . . . . . . . . . . . . . . . . . 1 --15 #

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.

ADMISSION A N D 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 C e r ~ c a t e 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 Contribu- tion 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.

P u b l i c a t i o n s to be h a d of t h e G e o l o g i c a l S o c i e t y , Burlington House.

Q U A R T E R L Y J O U R N A L . (Vols. Ill to LXXH, inclusive.)

Price to Fellows, 138. 6d. each (Vols. XV, XXIII, XXX, and XXXIV to L I X I I , 16s. 6d.), in cloth.

G E N E R A L I N D E X TO T H E F I R S T F I F T Y V O L U M E S OF T H E Q U A R T E R L Y J O U R N A L (1845-1894). Par t I (A-La). Par t H (La-Z). Price 5s. each. To Fellows 38. 9d. each. [Postage 3d.]

GEOLOGICAL L I T E R A T U R E added to the Geological Society's Library during the years ended December Slst, 1894-1912. Pries 2e. each. To Fellows, ls. 6d. ~ c h . [Postage 3d.]

T H E H I S T O R Y O F T H E GEOLOGICAL SOCIETY OF L O N D O N , by H. B. WOODWARD, F.R.S. Price 7s. 6d. To Fellows, 6s. [Postage 6~.~

T H E CENTENARY' OF T H E GEOLOGICAL SOCIETY OF LONDON, recorded by W. W. WATTS, F.R.S. Price 2s. net. [Postage 3d.]

H U T T O N ' S ' T H E O R Y O F T H E E A R T H , ' Vol. III, edited by Sir ARCHIBALDGEIKIE, D.C.L., F.R.S. Price 3s. 6 d . To Fellows, 2s. [Postage 4~.]

T H E GEOLOGY OF N E W Z E A L A N D . Translated by Dr. C. F. FISCHER from the works of MM. HOCHSTETTER-~ ]~TERMANN. With an A t ] u of Six Maps. Fellows may purchase one Copy of t~ais Book at ~ . Additional Copiu ~11 be charged 4e. [ P o s S e 5d.]

CONTENTS.

Pages Proceedings of the Geological Society, Session 1916-17, 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 . . . . . . . . . . . . . . . . . . . . . 1

2. ~r. H. C. Sargent on Lower Carboniferous Spilites from Derbyshire . . . . . . . . . 11

3. Prof. H. H. Swinnerton & I~Ir. A. E. Trueman on the Morphology and Development of the Ammonite Septum (Plates II-IV) . . . . . . . . . . . . . . . . . . . . . . . . 26

[The Editor of the Quarterly Journal is directed to ma.~e it known to the Public that t h e A u t h o r s a l o n e a r e r e s p o n s i b l e fo r t h e f a c t s a n d o p i n i o n s c o n t a i n e d in t h e i r r e s p e c t i v e P a p e r s . ]

~.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, w i t h p r o p e r r e f e r e n c e s , a n d in a l l r e s p e c t s in f i t c o n d i t i o n fo r b e i n g a t once p l a c e d in t h e P r i n t e r ' s h a n d s . 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.

O 4 ~ ,

Vol. L X X n L N o . 0 - 9 0 . PART 2.

T H B

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, 1918.

LONDON.

LONGMANS, GREEN, AND CO.

PARIS:--CHA]LLF~ KLINCK6IXCK, 11 RUB D ! T, Tlr,T,R_

BOLD £ L 8 0 AT M AFARTMENTB OF THB $OOIBTY.

Pries Five 8billings.

LIS'P OF THI~ OFFICERS AND COUNCIL OF THE

GEl)LOGICAL S )CIETY OF LONDON. Elected February 15th, 1918.

~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., LL.D., F.R.S. So.D, LL.D., F.R.S.

Sir Jethro J. Harris Teall, M.A., D.So., LL.D., F.R.S.

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., LL.D., F.R.S. Finlay Lorimer Kitchln, M.A., Ph.D. George William Lamplugh, F.R.S.

Herbert Lapworth, D.So., M.Inst.C.E. Major Henry George Lyons, D.Sc., F.R.S. Prof. John Edward Mar t , 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.,

LL.D., F.R.S. Prof. Henry Hurd Swinnerton, D.So. Sir Jethro J. Harris Teall, M ~ . , D.So,

LL.D., F.R.S. Herbert Henry Thomas, M.A., So.D. Samuel I~azzledine Warren. Prof. William Whitehead Watts , M.A.,

So.D, LL.D., F.R.S.

Dr. F. A. Bather. Prof. J. Cadman. Mr. R. M. Deeley. Dr. J. V. Elsden. Prof. E. J. Gal~ood.

Ptrmantnt ~ tfrtta~. L. L. Belinfante, M.Sc.

Kibrarian. C. P. Chatwin.

~Itrk. M. St. John Hope.

~ e ~ i ~ t a n t in ~ . ib ra t~ . Arthur Greig.

S T A N D I N G P U B L I C A T I O N c o M M I T T E E . Mr. G. W. Lamplugh, P r e ~ n t .

Dr. H. Lapworth. ] Dr. Herbert H. Thomas. S 8ecretari~.

Mr. J. F. N. Green. Prof. W. J . Sol lu. Dr. F. L. Kitchin. Sir Jethro Teall. Major H. G. Lyons. Mr. S. H. Warren. Mr. R. D. Oldham. Prof. W. W. Watts .

O R D I N A R Y M E E T I N G S O F T H E G E O L O { } I C A L S O C ~ TO BE H E L D AT BURLINGTON HOUSE.

S~ssio~ 1918-1919. 1918.

Wednesday, November . . . . . . . . . . . . . . . . . . . . . 6#--20 ,, December . . . . . . . . . . . . . . . . . . . . . 4 - - 18 #

1919. ,. January . . . . . . . . . . . . . . . . . . . . . 8#--22 # ,, February (Ann~cd Meeting,

Friday, February 21st) . 5#--26 # ,, March . . . . . . . . . . . . . . . . . . . . . . . . 12--26 # ,, April . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 # ,, May . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - -21 #

June . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - -25 # , t

[ B~s4m~s t o ~ commetwe at 5.30 p.m. prec/sdy.] The asterisks denote the dates on which the Council will meet.

ADMISSION AND PRIVILEGES

OF

FELLOWS 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 Contribu- tion 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 Contribu- tion 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 d u r i n g t h e f o r t n i g h t c o m m e n c i n g on t h e f i r s t M o n d a y i n S e p t e m b e r ; see also next page). Under certain restrictions, Fellows are allowed to borrow books from the Library.

P u b l i c a t i o n s to be h a d o f t h e G e o l o g i c a l S o c i e t y , B u r l i n g t o n House.

Q U A R T E R L Y J O U R N A L . (Vols. H I to LXXH, inclusive.)

Price to Fellows, 13s. 6d. each (Vols. XV, XXIII, XXX, and XXXIV to LXXI[, 16s. 6d.), in cloth, i

G E N E R A L I N D E X T O T H E F I R S T F I F T Y V O L U M E S O F T H E Q U A R T E R L Y J O U R N A L (1845-1894). Par t I (A-La). Par t H (L~-Z). Price 5s. each. To Fellows 3a. 9d. each. [Postage 3d.]

G E O L O G I C A L L I T E R A T U R E added to the Geological Society's Library during the years ended December 31st, 1894-1912. Price 28. each. To Fellows, Is. 6d. ~ch . [Postage 3d.]

T H E H I S T O R Y O F T H E G E O L O G I C A L S O C I E T Y O F L O N D O N , 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 A t l u of Six Maps. Fellows may purchase one Copy of tJ~is Book at 2s. Additional Copi~

be chareed 4e. [Postage ~ . ]

CONTENTS.

PAPERS READ.

Page 4. Mrs. Longstaff on A c ~ and Ac~oi0~ (Plates V & YI) ..................... 59

5. Mr. L. M. Parsons on the Carboniferous Limestone bordering the Leicester- shire Coalfield (Plates VII-XI) .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6. 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) ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

[The Editor of the Quarterly Journal is directed to make it known to the Public that the Au thor s a lone are respons ib le for the fac t s and opinions con ta ined in t he i r r e spec t i ve 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, wi th proper r e fe rences , and in al l r e spec t s in f i t cond i t ion for being a t once p laced in the P r i n t e r ' 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 du r ing the fo r tn igh t commencing on the first Monday in September, when the L i b r a r y is closed for t he purpose of cleaning.

The Secre ta r ies of the Society are desirous of complet ing a record of the services r e n d e r e d by the Fel lows in connexion w i t h the presen t War . Details of service, w i t h a s t a t e m e n t of rank , reg iment , m i l i t a r y

honours , and a n y o ther informat ion, wi l l be g lad ly received f rom Fellows, e i ther w i t h reference to themselves or to those k n o w n to them.

Q : : : : I ::ii:i; ~i~ii i? iiii?i ii~ii ......... ? :ii~:::ii : B Vol . L X X I I I . N o . o91.

P A R T 3.

T H E

QUARTERLY JOURNAL

OF THE

GEOLOGICAL SOCIETY.

THE PERMANENT SECRETARY.

[With Nine Plates, illustrating I)r. C. T. Trechmann's Paper.]

NOVEMBER 30th, 1918.

LONDON.

LONGMANS, GREEN, AND CO.

PARI~: - -CHARLES KLINCKSIECK. 11 RUE DE LILLE

SOLD ALSO AT THE APART,~,IENTS OF THE 5OCIETY.

Price Five Shillings.

LIST OF THE OFFICERS AND COUNCIL OF THE

GE()LOGICAL SOCIETY OF LONDON. Elected February 15th, 1918.

~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., LL.D., F.R.S. i Se.D., LL.D., F.R.S.

Sir Jethro J. Harris Teal], M.A., D.So., LL.D., F.R.S.

~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. i John Frederick Norman Green, B.A. Alfred Harker, M.A., LL.D., F.R.S. Finlay Lorimer Kitchin, M.A., Ph.D. George William Lamplugh, F.R.S.

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.,

LL.D., F.R.S. Prof. Henry Hurd Swinnerton, D.Sc. Sir Jethro J. Harris Teall, M.A., D.Sc,

LL.D., F.R.S. Herbert Henry Thomas, M.A., Sc.D. Samuel Hazzledine Warren. Prof. William Whitehead Wat ts , M.A.,

Sc.D, LL.D., F.R,S.

Prcmantnt Dttrttar~. L. L. Belinfante, M.Se.

]Librarian. C. P. Chatwin.

Chdt. M. St. John Hope.

~le~i~tant in ]£ibra~. Arthur Greig.

S T A N D I N G PUBLICATIO:SI COMMIrPTEE. Mr. G. W. Lamplugh, President.

Dr. H. Lapworth. Dr. Herbert H. Thomas. Secretaries. J

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.

O R D I N A R Y M E E T I N G S O F T H E G E O L O G I C A L S O C I E T Y TO BE HELD AT BURLINGTON HOUSE.

SEssIo• 1918-1919. 1918.

Wednesday, December . . . . . . . . . . . . . . . . . . . . . 4 - -18* 1919.

,, January . . . . . . . . . . . . . . . . . . . . . 8"- -22 ~ ,, February (Annu~t Meeting,

Friday, February 21st) . 5"- -26 * ,, March . . . . . . . . . . . . . . . . . . . . . . . . 12--26" ,, April . . . . . . . . . . . . . . . . . . . . . . . . . . . 9* ,, May . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 ---21 w

June . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - -25 ~ [Bummers wilt convmence at 5.80 p.m. precisety.]

The astmrisks denot~ the dates on which the Council will meet~

ADMISSION AND P R I V I L E G E S

OF

FELLOWS OF T H E 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 Contribu- tion 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 Contribu- tion 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.

P u b l i c a t i o n s to be h a d of t h e G e o l o g i c a l Soc i e ty , Burl ington House.

Q U A R T E R L Y J O U R N A L . (Vols. I I I to LXXII, inclulive.)

Price to Fellows, 138. 6d. each (Vols. XV, XXIII, XXX, and XXXIV to LXXII, 16s. 6d.), in cloth.]

G E N E R A L I N D E X TO TI-IE F I R S T F I F T Y V O L U M E S OF T H E Q U A R T E R L Y J O U R N A L (1845-1894). Part I (A-La). Part H (La~-Z). Price 58. each. To Fellows 3.~. 9d. each. [Postage 3d.]

Q E O L O G I C A L L I T E R A T U R E added to the Geological Society's Library during the years ended December 31st, 1894-1912. Price 2s. each. ToFellows, ls. 6d. e~ch. [Postage 3d.~

T H E H I S T O R Y O F T H E G E O L O G I C A L S O C I E T Y O F L O N D O N , by H. B. WOODWARD, F.R.S. Price 7s. 6d. To Fellows, 68. [Postage 6d.]

T H E C E N T E N A R Y O F T H E GEOLOGICAL SOCIETY OF L O N D O N , recorded by W. W. WATTS, F.R.S. Price 2s. net. [Postage 3d.]

H U T T O N ' S ' T H E O R Y O F T ~ I E E A R T H , ' Vol. ILI, edited by Sir ARCHIBALD GEIKIE, D.C.L,, F~R.S. Price 3s. 6d. To Fellows, 2s. [Postage 4d.]

T H E G E O L O G Y OF N E W Z E A L A N D . 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 a t 2s. Additional Copies will be charged 48. [Postage 5d.]

CONTENTS.

PAPERS READ.

7. Dr. C. T. Trechmann on the Trias of New Zealand (Plates XVII-XXV) . . P~.ge

165

8. Dr. F. A. Bather on Triassic Crinoids from New Zealand .... . . . . . . . . . . . . . . . . . . . . 247

[The Editor of the Quarterly Journal is directed to make it known to the Public that the A u t h o r s a lone a re r e s p o n s i b l e for t he f a c t s and op in ions c o n t a i n e d in t h e i r r e s p e c t i v e Pape r s . ]

**~ 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, wi th p r o p e r r e f e r e n c e s , and in al l r e s p e c t s in f i t c o n d i t i o n for be ing a t once p l a c e d in the P r i n t e r ' 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 S e c r e t a r i e s of t h e Soc ie ty a r e des i rous of c o m p l e t i n g a r e c o r d

of t h e se rv ices r e n d e r e d by t h e Fe l lows in connex ion w i t h t h e p r e s e n t

War . Deta i l s of service , w i t h a s t a t e m e n t of r a n k , r e g i m e n t , m i l i t a r y

honours , a n d a n y o the r i n f o r m a t i o n , w i l l be g l a d l y r e c e i v e d f r o m

Fel lows , e i t h e r w i t h r e f e r e n c e to t h e m s e l v e s or to t hose k n o w n to t h e m .

Vol. L X X I I L N o . 09@-. PART 4.

T H E

QUARTERLY JOURNAL

OF THE

GEOLOGICAL SOCIETY.

EDITED BY THE PERMANENT SECRETARY.

[With Five Plates, illustrating Mr, S. S. Buckmau's Paper.]

DECEMBER 31St, 1918.

ml-

LONDON :

LONGMANS, GREEN, AND CO. I

PARI~:- -CHARLES KLINCKSIECK, 11 RUE DE LILLE.

SOLD ALSO AT THE AI'ARTMEET8 OF THE ~OCIETY. /

Price Five ,~hilling~." t

LISI ~ OF THE OFFICERS AND COUNCIL OF T H E

GE()LOGICAL SOCIETY OF L(INDON. Elected February 15th, 1918.

~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., LL.D., F.R.S. I Sc.D., LL.D., F.R.S.

I Sir Tea[l, M.A., D.Sc, Jethro J. Harris LL.D., F.R.S.

~ttrttarit~. Herbert Henry Thomas, M.&., So.D. Herbert Lapworth, D.Sc., M.Inst.O.E.

dFartistn bttrttar~. ~rta~urtr. Sir Archibald Geikie, O.M., K.O.B., D.0.L., James Vincent Elsdon, D.Sc.

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., LL.D., F.R.S. Finlay Lorimer Ki~chin, M.A., Ph.D. George William Lamplugh, F.R.S.

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,

LL.D., F.R.S. Prof. Henry Hurd Swlnner~'on, D.Sc. Sir Jethro J. Harris Teall, M.A., D.Sc,

LL.D., F.R.S. Herbert Henry Thomas, M.A., Sc.D. Samuel Hazzledine Warren. Prof. William Whitehead Wat ts , M.A.,

Sc.D., LL.D., 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.

S T A N D I N G P U B L I C A T I O N C O M M I T T E E . Mr. G. W. Lamplugh, President.

Dr. H. Lapworth. Dr. Herbert H. Thomas. Secretaries. J

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.

O R D I N A R Y M E E T I N G S OF T H E GEOLOGICAL SOCIETY TO BE HELD AT BURLINGTON HOUSE.

Swss io~ 1 9 1 8 - 1 9 1 9 . 1919.

Wednesday, January . . . . . . . . . . . . . . . . . . . . . 8*--22 # ,, February (Annua~ Meeting,

Friday, February 21st) . 5#--26 * ,, March . . . . . . . . . . . . . . . . . . . . . . . . 12--26 # ,, April . . . . . . . . . . . . . . . . . . . . . . . . . . . 9* ,, May . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - -21 #

June . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - -25 # [ Busineg8 wil~ commence at 5.30 p.m. precise~y.]

The asterisks denot~ the dates on which flee Council will meet.

ADMISSION A N D P R I V I L E G E S

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 Contribu- tion 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 Contribh- tion 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.

Publ icat ions t o b e h a d o f t h e G e o l o g i c a l S o c i e t y , B u r l i n g t o n House.

Q U A R T E R L Y J O U R N A L . (Vols. I I I to LXXIII , inclusive.)

Price fm Fellows, 13s. 6d. each (Vols. XV, XXIII, XXX, and XXXIV to LXXIII, 16s. 6d.), in cloth.

G E N E R A L I N D E X TO T H E F I R S T F I F T Y V O L U M E S OF TI-IE Q U A R T E R L Y J O U R N A L (1845-1894). Par t I (A-La). Par t II (La-Z), Price 5s. each. To Fellows 3s. 9d. each. [Postage 3d.]

G E O L O G I C A L L I T E R A T U R E added to the Geological Society's Library during the years ended December 31st, 1894-1912. Price 2s. each. To Fellows, ls. 6d. each. [Postage 3d.]

T H E H I S T O R Y O F T H E G E O L O G I C A L S O C I E T Y O F L O N D O N , by H . B. WOODWARD, F.R.S. Price 7s. 6d. To Fellows, 6s. [Postage 6d.]

T H E C E N T E N A R Y O F T H E G E O L O G I C A L S O C I E T Y O F L O N D O N , recorded by W. W. WATTS, F,R.S. Price 2s. net. [Postage 3d.]

H U T T O N ' S ' T I - I E O R Y O F TI - IE E A R T H , ' Vol. III, edited by Sir At~CHIBALD CTEIKIE, D.C.L., F.R.S. Price 3s. 6d. To Fellows, 2s. [Postage 4d.]

T H E G E O L O G Y O F N E W Z E A L A N D . 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. Additional 'Copies will be charged 4s. [Postage 5d.]

CONTENTS.

PAPERS REAl).

Page

9. Mr. S. S. Buekman on Jurassic Chronology : I - -Lias (Plates XXVI-XXXI). 257

10. Mr. T. H. Burton on the Microscopic Material of the Bunter Pebble-Beds of No~inghamshire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

[TITLE-PAGE, CONTENTS, and INDEX tO Vol. LXXIII.]

[The Editor of the Quarterly Journal is directed to make it known to the Public that t h e A u t h o r s a l o n e a r e r e s p o n s i b l e fo r t h e f a c t s a n d o p i n i o n s c o n t a i n e d in t h e i r r e s p e c t i v e P a p e r s . ]

**# 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, w i t h p r o p e r r e f e r e n c e s , a n d in a l l r e s p e c t s in f i t c o n d i t i o n f o r b e i n g a t once p l a c e d in t h e P r i n t e r ' s h a n d s . 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.