quarterly journal...vol. lxxi, no. 0-81, pare 1. the quarterly journal of the geological "i...

Vol. L X X I , NO. 0 -81 , PARe 1.

THE

QUARTERLY JOURNAL

OF THE

"I

GEOLOGICAL SOCIETY.

THE ASSISTANT-SECRETARY.

[With Fourteen Plates, illustrating Papers by Dr. A. Vaughan, Mr. C. T. Trechmann, Mr. T. C. Nicholas, and Mr. C. Dawson & Dr. A. Smith-Woodward.]

SEPTEMBER 17th, 1915.

LONDON :

LONGMANS, GREEN, AND CO.

P A R I S : - - C H A R L E S K L I N C K S I E C K , 11 R U E D E L I L L E .

SOLD ALSO AT T H E A P A R T M E N T S OF T H E SOCII~TY.

P nee .Five Shillings.

LIST OF THE OFFICERS AND COUNCIL OF THE

GEOLOGICAL SOCIETY OF LONDON. Elected February 19~h, 1915.

~r~i~tnt. Arthur Smith Woodwaxd, LL.D., F.R.S., F.L.S.

Henry Howe Bemrose, J.P., So.D. I Aubrey S~ahan, Se.D., LL.D., F.R.S. Clement Reid, F.R.S., F.L.S. I The Roy Henry Hoy~e Winwood, M.A.

~cr~tari~. Herbert Henry Thomas, M.A., Sc.D. I Herbert Lapworth, D.Sc., M.Inst.C.E.

~lFor~ig'n becrctar~. ~r~a~ur~r. SirArohlbMd Geikie, O.M., K.C.B., D.C.L., [ Bedford MoNeill, Assoc.R.S.M.

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

© © ~ ~ . Henry Howe Bemrose, J.P., Sc.D. Prof. Charles Gilbert Cullis, D.Sc. R. Mountford Deeley, M.Inst.C.E. John William Evans, D.Sc., LL.B. Prof. William George Fearnsides, M.A. Sir Archibald Geikie, O.M., K.C.B., D.C.L.,

LL.D., Sc.D., F.R.S. Walcot Gibson, D.Sc. Sir Thomas Henry Holland, K.C.I.E.

D.Sc., F.R.S. Prof. Owen Thomas Jones, M.A., D.Sc. Finlay Lorimer Kitchin, M.A., Ph.D. Herbert Lapworth, D.Sc., M.Inst.C.E. Bedford McNeill, Assoc.R.S.M.

John Edward Marr, M.A., Sc.D, F.R.S. Edwin Tulley Newton, F.R.S. Robert Heron Rastall, M.A. Clement Reid, F.R.S., F.L.S. Prof. William Johnson Sol]as, M.A., Sc.D.,

LL.D., F.R.S. Aubrey Strahan. Sc.D., LL.D., F.R.S. J. J . Harris Tea]], M.A., D.Sc., LL.D.,

F.R.S. Herbert Henry Thomas, M.A., Sc.D., William Whitaker, B.A., F.R.S. The Rev. Henry Hoyte Winwood, M.A. Arthur Smith Woodward, LL.D., F.R.S.

F.L.S.

~[Jgigtant:,btcretarp, ~,ibrartan, a.~ 6Itrh. L. L. Bellnfante, M.Sc.

¢{~i~tant~it~raria.. ~t~i~tant-~:I~rk. C. P. Chatwin. M. St. John Hope.

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 . Dr. A. Smith Woodward, President.

Dr. H. Lapworth, Dr. Herbert H. Thomas, j Secretaries.

Dr. 1¢. A. Bather. Mr. Bedford MeNeilL Dr. H. H. Bemrose. Dr. J. E. Mart. Prof. C. G. Cullis. Mr. E. T. Newton. Dr. J. W. Evans. Prof. W. J. Sollas. Prof. W. G. Fearnsides. Dr. A. Strahan. Dr. Walcot Gibson. Dr. J. J. H. TeaH. Prof. O. T. Jones.

E V E N I N G 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.

SEssIoN 1915-1916. 1915.

Wednesday, November . . . . . . . . . . . . . . . . . . . . . 3"- -17 ,, December . . . . . . . . . . . . . . . . . . . . . 1- -15"

1916. Wednesday, January . . . . . . . . . . . . . . . . . . . . . . . . 5" - -19"

,, February (Anniversary, Friday, Feb. 18th) ...... 1" - -23"

,, March . . . . . . . . . . . . . . . . . . . . . . . . 8--22* ,, April . . . . . . . . . . . . . . . . . . . . . . . . . . . 5" ,, May . . . . . . . . . . . . . . . . . . . . . . . . . . . 10--24"

June .. . . . . . . . . . . . . . . . . . . . . . . . . . 7--28* [ B~i/ness wi$~ corr~nence at Eight o' 6goc]¢ precgse~y.]

The asterisks denote the dates on which the Council will meef~

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 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 9.5 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

• " " - - S - - t h e f o r t m 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 m S e p t e m b e r ; ee also next page), and on Meeting-Days until 8 P.M. Under certain restrictions, Fellows are allowed to borrow books from the Library.

P u b l i c a t i o n s t o 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 ,

Burlington House.

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

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

G E N E R A L I N D E X TO TIIE F I R S T F I F T Y VOLUMES OF T H E Q U A R T E R L Y J O U R N A L (1845-1894). Par~ I (A-La). Par~ 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 I I 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 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 H E E A R T H , ' Vol. HI, edited by Sir ~CHIBALD CTEIKIE, D.C.L., F.R.S. Price 3s. 6d. To Fellows, 2s. [Postage 4d.]

T I I 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. HOCHSTETTER ~5 PETERMANN. With an Atlas of

Six Maps. Fellows may purchase one Copy of ~is Book at 2s. Additional Copiem

will be charged 4s. [Postage 5d.]

CONTENTS.

Pages Proceedings of the Geological Society, Session 1914-15, including the

Proceedings at the Annual General Meeting, the President's Anniversary Address, etc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i-lxxxi

PAPERS READ. Page

1. Dr. A. Vaughan on the Correlation of Dinantian & Avonian (Plates I-VII). 1

2. Mr. C. T. Trechmann on the Scandinavian Drift of the Durham Coast and the General Glaciology of South-East Durham (P1. ¥ IH) . . . . . . . . . . . . . . . . . . 53

3. Mr. T. C. Nicholas on the Geology of the St. Tudwal's Peninsula, Carnar- vonshire (Plates IX-XIII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

4. Mr. C. Dawson & Dr. A. Smith Woodward on a Bone Implement from Piltdown, Sussex (P1. XIV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

[The Editor of the Quarterly Journal is directed to make it known to the Public t l ~ t 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, 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 ~he 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 Library is open until Eight P.M. on the Days of Meeting for the loan of books, and from Eight P.M. unt i l the close of each Meeting for conversational purposes only.

m,m..._

V o l . L X X I . N o . 0 - 8 2 . Pxx~ 2.

THE

QUARTERLY JOURNAL

OF THE

GEOLOGICAL SOCIETY.

THE ASSISTANT-SECRETARY.

[With Thirteen Plates, illustrating Papers by Mr. Clement Reid, Xr. S. H. Warren, Dr. Stanley Smith, Dr. A. H. Cox, and Prof. O. T. Jones & Xr. W. J. Pagh.]

FEBRUARY 23rd, 1916.

LONDON :


P A R I S : - - C H A R L E S KLINCKSLECK, 11 R U E D E IJIIALE.

SOLD ALSO AT T H E A P A R T M E N T S OF T H E SOCII~TY.

Price .Five 8billings.


GE()LOGICAL SOCIETY OF LONDON. Elected February 18th, 1916.

Alfred Harker, M.A., LL.D., F.R.S.

Sir Thomas Henry HoLland, K.C.I.E., The Rev. Henry Hoyte Winwood, M.A. ~ I).So., F.R.S. Arthur Smith Woodward, LL.D., F.R.S. Edwin Tulley Newton, F.R.S.

~tcrctari¢~. Herbert Henry Thomas, M.A., So.I). Herbert Lapworth, D.So., M.lmst.O.E.

dFor¢igax ~¢crrtar~. ~rra~ur,r. SirArchibMd Geikie, O.M., K.C.B., I).C.L., Bedford McNeil1, Assoc.R.S.M.

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

Henry Bury,~.M.A., F.L.S. Prof. John Cadman, D.Sc., M.Inst.C.E. Prof. Charles Gilbert Cullis, I).Sc. R. Mountford I)eeley, M.Inst.C.E. Prof. William George Fearnsides, M.A. Sir Archibald Geikie, O.M., K.C.B., D.C.L.,

LL.D., Sc.i)., F.R.S. Walcot Gibson, I).Sc. Alfred Harker, M.A., LL.D., F.R.S. Sir Thomas Henry Holland, K.C.I.E.,

D.Se., F.R.S. Finlay Lorimer Kitchin, M.A., Ph.D. Herbert|Lapworth, D.Sc., M.Inst.C.E. Bedford McNeill, Assoc.R.S.M.

John Edward Marr, M.A., Sc.D., F.R.S. Edwin Tulley New~on, F.R.S. Richard Dixon O]dham, F.R.S. Robert Heron Rastall, M.A. Prof. Thomas Franklin Sibly, D.Sc. Prof. William Johnson Sollas, M.A., Sc.D.,

LL.D., F.R.S. J. J. Harris Teall, M.A., D.Sc., LL.D.,

F.R.S. Herbert Henry Thomas, M.A., Sc.i). William Whif~ker, B.A., F.R.S. The Rev. Henry Hoyte Winwood, M.A. Arthur Smith Woodward, LL.D., F.R.S.

F.L.S.

~6i~tant--:b~crttarp, g i b r a r i a n , an~ ~;i~rk. L. L. BelLufante, M.Se.

~a~i~ tant~lLif~rariaa. ~a~i~tant:CI~rk. C. P. Chatwin. M. St. John Hope.

Arthur Oreig.


SESSION 1915-1916.

1916. Wednesday, February ..................... 23 v

,, March ........................ 8--22~ ,, April . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ~ ,, May ... . . . . . . . . . . . . . . . . . . . . . . . . 10--24 ~*

June ... . . . . . . . . . . . . . . . . . . . . . . . . 7--28 ~ [ B~siness wi~ con~mence a~ Eigh~ o' C~oc~ precise~y.]

The asterisks denote the dates on which the Council will meek

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

OF




The Fellows are entitled to receive gratuitously all the volumes or parts of volumeB 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 f o r t n i g h t c o m m e n c i n g on the first M o n d a y in S e p t e m b e r ; see also next page), and on Meeting-Days until 8 P.~. UncIer 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 had of the Geological Society, 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. III to LXX, inclusive.)

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

G E N E R A L I N D E X TO T I l 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 Q 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 3ist , 1894-1912. Price 2s. each. To l~ellows, 18. 6~. each. [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.I~.S. Price 7s. 6d. To Fellows, 68. [Postage 6d.]

T I l E C E N T E N A R Y OF T H E GEOLOG~ICAL SOCIETY OF LONDON, recorded by W. W. WATTS, F.R.S. Price 28. net. [Postage 3d.J

I= IUTTON'S ' T H : E O R Y O F T I l E E A R T H , ' ¥ol. HI, edited by Sir ARCtIIBALD GEIKIE, D.C.L,, F.R.S. Price 3s. 6d. To Fellows, 28. [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. HOCHSTETTEI~ • PETERWrANN. With an Atlas of Six Maps. Fellows may purct~se one Copy of t~is Book at 28. Additional Copies

will be charged 4s. [Postage 5d.]

CONTENTS,

PAPERS READ. Page

14. Mr. V. C. Illing on the Parado.xidian Fauna of a Part of the Stockingford Shales (Plates XXVIII-XXXVIII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386

15. ~Ir. T. C. Nicholas on the Trilobite Fauna of the Middle Cambrian of the St. Tudwal's Peninsula (Plate XXXI~) ..................... . . . . . . . . . . . . . . . . . . . . . 451

16. Mr. L. Richardson on the Inferlor-Oolite and Contiguous Deposits of the Doulting-Milborne-Port District (Plates XL'XLIII) ... . . . . . . . . . . . . . . . . . . . . . . . . 473

17. i~Ir. E. T. Paris & l~Ir. L. Richardson on some Inferior-Oolite Pectinidm (Plates XLIV & XLV) .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521

18. Dr. P. G. H. Boswell on the Stratigraphy and Petrology of the Lower Eocene Deposits of the North-Eastern Part of the London Basin (Plates XLVI-LI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 536

[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.]

~ 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, w i t h p r o p e r r e f e r e n c e s , and 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 be ing a t once p l a c e d in t he 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~ o~ Saturdays (when the hours are from 10 to 1), and

excep t 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 rs t M o n d a y in

S e p t e m b e r , w h e n t h e L i b r a r y i s c l o s e d for t h e p u r p o s e of c l ean ing . The Library is open until Eight P.~f. on the Days of ~eeting for the loan of books, and from Eight p.~r. until the close of each Meeting for conversational purposes only.

~ i ~ Q~

L _ ~ u

Vol . L X X I . N O . 0 - 8 3 , Pa2~ 3.

T H E

Q U A R T E R L Y J O U R N A L

OF THE

GEOLOGICAL SOCIETY.

THE PERMANENT SECRETARY.

[With Twenty-four Plates and three folding tables, illustrating Papers by Mr. V. C. IUing, Mr. T. C. Nicholas, Mr. L. Richardson, Mr. E. T. Paris & Mr. L. Richardson, and Dr. P. G. H. Boswell.]

S.EPTEMBER l l th , 1916

LONDON :


PARIS :--CHARLES KLINCKSLEOK, 11 RUE DE I, ILI.,E SOLD ALSO AT THE APARTMENTS OF THE SOCIETY.

P~ee .Five 8hilling,.


GEOLOGICAL SOCIETY OF LONDON. Elected February 18th, 1916.

~grt~i~tnt. Alfred Harker, M.A., LL.D., F.R.S.

~itt-Prt~i~tnt~. Sir Thomas Henry Holland, K.C.I.E., t The Rev. Henry Hoyte Winwood, M.A.

D.Sc., F.R.S. ] Arthur Smith Woodward, LL.D., F.R.S. Edwin Tulley Newton, F.R.S.

~ttrttarit~. Herbert Henry Thomas, M.A., Se.D. Herbert Lapworth, D.Sc., M.Imst.C.E.

~'ortii~n bttrttar~. ~rta~urtr. SirArehibald Geikie, 0.M., K.C.B., D.C.L., Bedford McNeill, Assoc.R.S.M.

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

Henry Bury, ]if.A, F.L.S. Prof. John Oadman, D.Sc., M.Inst.O.E. Prof. Charles Gilbert Cullis, D.Sc. R. Mountford Deeley, M.Inst.C.E. Prof. William George Fearnsides, M.A. Sir Archibald Geikie, O.M., K.C.B., D.C.L.:

LL.D., Sc.D., F.R.S. Walcot Gibson, D.Sc. Alfred Harker, M.A., LL.D., F.R.S. Sir Thomas Henry Holland, K.C.I.E.,

D.Sc., F.R.S. Finlay Lorimer Kitchin, M.A., Ph.D. Herbert Lapworth, D.Sc., M.Inst.C.E. Bedford 1VIcNeill, Assoe.R.S.M.

John Edward 1VIarr, M.A., Sc.D., F.R.S. Edwin Tulley Newton, F.R.S. Richard Dixon Olclham, F.R.S. Robert Heron Rasta11, M.A. Prof. Thomas Franklin Sibly, D.Se. Prof. William Johnson Sollas, M.A., Se.D.,

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

LL.D., F.R.S. Herbert Henry Thomas, M.A., Sc.D. William Whitaker, B.A., F.R.S. The Rev. Henry Hoyte Winwood, M.A. Arthur Smith Woodward, LL.D., F.R.S.

F.L.S.

~trmantnt ~tcrttarp. L. L. Belinfante, M.Sc.

~ibrarian. C. P. Chatwin.

CItrk, M. St. John Hope.

~i~;tant in ~ibra~. Arthur Greig.

S T A N D I N G P U B L I C A T I O N COMMITTEE. Dr. A. Harker, Pres~ent.

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

Dr. F. A. Bather. Dr. F. L. Kitchin. Prof. T. F. Sibly. Prof. J. Cadman. Mr. B. McNeill. Prof. W. J. So]]as. Prof. C. G. Cullis. Mr. E. T. Newton. Sir Jethro Teall. Prof. W. G. Fearnsides. Mr. R. D. Oldham. Dr. A. Smith Woodward. Dr. W. Gibson.


SESSmN 1916-1917. 1916.

Wednesday, November .................. 8~--22 ,, December .... . . . . . . . . . . . . . . . . . 6m20 ~

1917. Wednesday, January ..................... 10~--24 @

, February (Anniversary, Friday, February 16th) . 7~--28 ~

,, March .... . . . . . . . . . . . . . . . . . . . . 14m28 a ,, April . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 ~ ,, May ... . . . . . . . . . . . . . . . . . . . . . . . . 2m16 a

June .. . . . . . . . . . . . . . . . . . . . . . . . . . 6--20 ~ ,7 [ B ~ n e s s wi~ commence at Eight o' C~ock precisely.]

The asterisks denote the dates on which the Council will meet.


oF




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, a n d e x c e p t d u r i n g the 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 in S e p t e m b e r ; see also next page), and on Meeting-Days until 8 p.~r. Under certain restrictions, Fellows are allowed to borrow books from the Library.

P u b l i c a t i o n s t o 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. III to LXX, inclusive.)

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

G E N E R A L I N D E X TO THE FIRST F I F T Y V O L U M E S OF T I l E Q U A R T E R L Y J O U R N A L (1845-1894). Part I (A-La). Par t II (La~-Z). Price 5s. each. To Fellows 3s. 9d. each. EPostage 3d.]

GEOLOGICAL 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. EPostage 3d.]

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

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

T H E GEOLOGY OF N E W Z E A L A N D . Translated by Dr. C. F. FISCHE~ from the works of MM. HOCHSTETTER & PETER~rANN. With an Atlas of Six Maps. Fellows may purchase one Copy of ~ i s Book at 2s. Additional Copies will be charged 48. [Postage 5d.j

CONTENTS.

PAPERS READ. Page

5. Dr. A. Dunlop on a Raised Beach on the Southern Coast of Jersey .. . . . . . . . 150

6. Mr. Clement Reid on the Laim Glacial Plants of the Lea Valley (Plate XV). 155

7. Mr. S. H. Warren on the Late Glacial, or Ponder's End, Stage of the Lea Valley (Plate XVI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

8. Prof. G. A. J. Cole on a Composite Gneiss near Barna (County Galway) ... 183

9. Dr. J. E. Marr on the Ashgillian Succession to the West of Coniston Lake. 189

10. Mr. E. I~I. Anderson & Mr. E. G. Radley on the Pitehstones of l~Iull and their Genesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

11. Dr. Stanley Smith on the Genus Lonsda~eia and Dibunophy~um rugosum (Plates XVII-XXI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

12. Dr. A. H. Cox on the Geology of the District between Abereiddy and Abereastle (Pla~es XXII-XXVI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

13. Prof. O. T. Jones & Mr. W. J. Pugh on the Geology of the District around ]Ylachynlleth and the Llyfnant Valley (Plate XXVII) . . . . . . . . . . . . . . . . . . . . . . . . 343

[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 conf ined in their respective Papers.]

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T H E

QUARTERLY JOURNAL

OF THE

GEOLOGICAL SOCIETY.

THE PERIVlANENT SECI~ETARY.

[With Five Plates and one Folding Table, illustrating Papers by Mr. R. H. Rastall & Mr. W. H. Wilcockson, Mr~ F. P. ~Iennell, Prof. X. Stainier, and Lieut. A. W. R. Don & Dr. G. Hickling.]

Jx~vxR~ 13th, 1917.

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Dr. F. A. ]~ather. Dr. W. Gibson. Prof. T. F. Sib]y. Prof. J. Cadman. Dr. F. L. Kitehin. Prof. W. J. Sollas. Prof. C. G. Cullis. Mr. E. T. Newton. Sir Jethro Teall. Dr. J. ¥ . Elsden. Mr. 1~. D. Oldham. Dr. A. Smith Woodward. Prof. W. G. Fearnsides.

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CO NTENTS.

PAPERS I~EAD. Pa~e

J 9. ]~Ir. 1~. It. Ras~all & Mr. W. H. Wilcockson on the Accessory Minerals of the Granitic Rocks of the English Lake District . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 592

20. Mr. F. P. Mennell on the l~ocks of the Lyd Valley, above Lydford (Plate LII) ........... • ................................................................... 623

21. Prof. X. Stainier on a New Eurypterid from the Belgian Coal Measures (Plate LIII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..... 639

22. Lieut. A. W. R. Don & Dr. G. Hickling on Parian decipiens (Plates LIV-LVI). 648

[TITI~E-PAGE, CONTENTS, and INDEX tO Vol. LXXL]

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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 ]~ionday in September, when the Library is closed for the purpose of clean~g.

quarterly journal...vol. lxxi, no. 0-81, pare 1. the quarterly journal of the geological "i...

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