t. PERSATUAN GEOLOGI MALAYSIA NEWSLETTER

R.W. Murphy S.H. Chan Esso Exploration Inc. P.O. Box 57, Tanglin Post Office Singapore l~ Dept. of· Geology University of Malaya Kuala Lumpur Honorary...

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Geological Society ' of Malaysia



PERSATUAN GEOLOGI MALAYSIA

NEWSLETTER Number 42

M.ay 1973 CONTENTS

GEOLOGIC NOTES K. F. G. Hosking and E. B. Yeap: fill Occurrence of BoUYnoz:ite (2PbS.C~S . Sb2S3) in Perak:, West Malaysla.

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NEV.'S OF 'IRE SOCIE'IY

Tentative Schedule of GSM Meetings 1973

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Proceedings, Regional Conference on the Geology of Southeast Asia

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Geology of the Malay Peninsula

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GSM Loan Fund

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Membership

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EMPLOYMENT OPPORTUNITIES

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Issued bimonthly by the Geological Society of Malaysia, c/o Department of Geology, University of Malaya, Kuala Lumpur,

Price to non-members: MZ1/copy. Bock issues MZO·50 to members.

GEOLOGICAL SOCIETY OF MALAYSIA Officers - 1973/74 President

Vice-President

R.W. Murphy Esso Exploration Inc. P.O. Box 57, Tanglin Post Office Singapore l~

S.H. Chan Dept. of · Geology University of Malaya Kuala Lumpur

Honorary Secretary

Assistant Secretary

G.B. Leigh Dept. of GeoGr aphy University of Malaya Kuala 1 uinpur

C. H. Yeap Dept. of Geology University of Malaya lCuala Lumpur

Treasurer

!:;ditor

E.V. Gangadharam Dept. of Geology University of Malaya Kuala Lumpur

D.K. Tan Dept. of Geology University of Malaya Kuala Lumpur Immediate Past President P. H ~ Stauffel~

Dept. of Geology of Malaya Kuala Lumpur

Univel~sity

Councillors 1973/74 K.Y. Foo Geological Survey galan Gurney Kuala Lumpur

K. W. (;hoy Conzinc Riotinto P.O. Box 291 Kuala J.Ju:npur

T.H. Tan Geology De partment University Kebangsaan Kuala Lumpur

Councillors 1973/75

S.C. Toh Con zinc Riotinto P.O. Dox 291 Kuala Lumpur

E.H. Yin Geolcgical Survey P.O. Box 1015 Kuala LumpUJ:'

Addl~ess

of the Soci9ty:

M. K. Choo Associated l'1ines P . O. Bo); 2125 Kuala Lumpur

K.H. Leong Geological Survey Kota Kinabalu Sabah

F.S. Chong Geological Survey P.O. Box Hn5 Ipoh, Perak

Geological Society of Halaysia c/o Dept. of Geology UIli vey's i ty of Malaya Kuala Lumpur

GEOLOGIC NOTES An Occurrence of Bournonite (2PbS.~S.Sb2S3) in Perak, tA1est Malaysia

K.F.G. Hosking and E.B. Yeap, Departnent of Geology, University of Malaya, Kuala Lumpur, Malaysia.

DUring a visit to the Bider (Perak) dredgjng property of Associated Mines Sdn. Bhd., in November, 1972, one of us obtained a semple that, to the naked eye, consisted essentially of angular grain:; of galena that, due to abrasion, had matt rather bright surfaces. This galena had been collected by the Mill SuPerintendent during the further beneficiation of the starmiferous placer concentrate from the dredge. The size and physical character of the galena grains suggested that they had migrated little or no distance from their primary source and that they might even have been renoved from the primary source by the dredge buckets.

Examination of a polished briquetted protion of the sanple under the microsqope in :reflected light, confinIed that the overwhelming majority of the grains were, indeed, galena, albeit often with sone JIOst interesting. inclusions of pyrite and other species. A few grains of pyrite also: qecurred, together with one grain that one of us tentatively identified as bournonite bordered by a rim of alteration products. This identification was subsequently confirmed by rore precise examination under the microscope and the mineralogic character of the rim was resolved. Subsequently a further six portions of the original sanple were briquetted, polished, and examined under the microscope, but no further grains of boumonite were found.

Description of the boumonite grain The boumonite grain U11der review is T-shaped, but the vertical piece is c. 3 times as thick as the horizontal one and about half its length: to be nore precise) the lengths in question are 2.1 nun and 1. 3 JIm respectively. The optical properties of the core of the grain agree very well with those of boumonite as described by Uytenbogaardt and Burke (1971,

Geological Society of I>1a1aysia Newsletter no. 42, Hay 1973

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Voids ( I - micro-'indentation 'mark)

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Bournonite ( twin laminae} : "

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Fig. I . Part of the bour noni te groin) drown from a photomicrograph) showing diagromaticolly the parquet twins and the olfera:tton zone (A) .

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pp. 68-69) and by Ranrlohr (1969, pp. 725-729). However,' the first indication that the grain was bournonite beyond reasonable doubt, was th~ fac,t that,,~tv.'een crossed polars it displayed a beautiful parquet t~~"due to polysynthetic twinning. Figure 1 is an attempt to portray this difficult subject which, as Ranrlohr (op. cit., p.726) observes II Is'the rrOst noticeable characteristic of bournonite": however, for those to whom Ranrlohr's work is available, a far better idea of this beautiful texture may be obtained by looking at his figure 467 (p. 727). In green light (546 nun) and using Reflectance Standaro ttmgstel1 carbide (47 42 53) which, at the wave-length in question, has a reflectance of 45.9%, the C9re of the grain provided :the following reflectance values: - 34. 2, 3, 34. 2, 34. 9, 35. 5, 35.1, 35.2, 34. 8, 35. 9 and 36. 2 . These figures a~ereasonably well with the range from 34.6-35.2 to 35.9-39.4 giVEmby Uytenbogaardt and Burke (op. cit., p. 68) and with those of ~cLeod and Chamberlain (1968) who, in their table, indicate that the reflectivity ofirh,.e: species in question ranges from c. 35 to over 38%., It is, however, relevant to note'that some, at least,of the values recoroed by the" last-nentioned workers were obtained in white light.

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Me~ts of the rnicro-haroness, tmder a load of 100 g. , provided the following VHN results:- 133,137,139,140,142,147,156, 165, 170, 184. In part the variation may have been due to the presence of a mnnber of, minute' cracks in the specimen. For the species in question Uytenbogaardt and Bur.ke (op. cit., p.69) provide the following values:- '132-2-3. However, these values were obtained when loads of 20 to 50 g. were used.

McLeoci and Chamberlain (op. cit.) indicate that the VHN of the mineral may range from 167 to 210. During ,determination of the micro-hardness it was noticed that ra,dial fractures invariably developed arotmd the indentations: these, as' will be seen from examination of fig. 1 ; tend to develop from the comers rather than from the sides of the identification and so, according to the classification of YOtmg and Millman (1963-64) ~hould be termed star radial fractures rather than side radial ones. It is, however, interesting to ·note that YOtmg and Millman figure an indentation on the (010) surface of bournonite that has side radial fractures associated with it (op. cit., Plate 1, fig. 8, oppo. p. 458). The difference between the writers I fracture pattern and that of YOtmg and Millman doubtless stems from the fact that the latter were working on the (010) surface whilst the fonner were investigating one which was about parallel to the (001)

4 The altered rim

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The, aite~~ r.tm. of the grain, ~ch varies' in ,width from' c. 10. to c~ 190 Jilic;rons? consi~s of three reasonably well-defined zones, each 6f which can be·, distinguished by its mineralogical compositibn ~d/or textural character.

'. The·o¢er.zone Consists essentially of chalcopyrite. The niiddle one is finely IIDttled and corrposed of galena and what is alIIOst ~rt~ly tetrahedrite, but the identification' cannot be confil"'Jred by ~flectance and, micro-hardness meas~ts as the' . individual co1IpOIlent masses are too small., The irme:rnost' zone is made up of mmero\lS' irregularly shaped voids of widely varying' size which are partly ~in~d:by an. inner ~ of chalcopyrite and an outer one of tetrahedrite (?): the matrix of this zone is boumortite.

, The 'iI!in~ogi.cal character, of ,the rim is, doubtiess, in .part due to the de~tion ofboumonite '(Pb, Cu, Sb) to tetrahedrite (Cu. Sb) and gql.ena (Ph). The genesis of the , chalcopyrite is sonewhat IIDre problematical. AIthough boumonite may contain a little iron it would probably not be enough to account for that OCcu:rTing in the chalcopyrit~. It is likely that iron introduced from external source reacted , with boumonite, or one of) its breakdown products, to produce the miner'a;L :Underdiscussion., Po~sibly tr.is SOllI'Ce of 'irt?n was' a ,mineral, say pYI'it~, that occupied ,·the ,voids in the rim:' howeVer, the shapes of the' VOids are ,such that they provide no evidence for' this. The replacenent of either boumonite or its degradation products leads to a further unsolved problem. What happened to the released lead and ant:i.IIOny?

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vJhilst the writell:3 believe that this is the first recoro of boumonite from West Mal~ys~(and fro~ the entire Tin Belt of Southeast Asia) other~tinmy-bearing species ha~: been reco:roed. A nUmber of these., species has been found in areas not, far· remved from Bidor. It is of :fu:rrtll.er int~st to note that :in"West, Malaysia s whilst a number of ocour.ren¢es are, known to the west::cf the Main Range, to, the ~a.St of it antino~Y:sPecies have only been .r,eco:roed, from the Sg. Merbau' are~. (stibnite)' anq:the Raub gold ~es· (stibnite). One of us has, however, mntatively identified· t'1::iOulangerite" in' ore from the: Pahang Consoli?atedMme: at" Sungei Lembing. ' 'Finally, the 'following table' provides data regaroing·the ',' other antinony speci~s in West, Malaysia that have Cbeeil established during the past five years by the ·pepart:nent of. Geology, University of Malaya: to date, data concerning only some of these have been published. oc~ce 'of

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Mineral

Locality Bidor, Peral< Tekka, Perak' Sin Nam Lee Pipe, Ampang, Perak

Sin Nam Lee Pipe, Ampang, Perak Boulangerite

5PbS.2Sb 2S3

Sungei Lernbing, PahaI.g

REFERENCES McLEOD, C. R. and CHAMBERlAIN, J .A., 1968. Reflectivity and rnicrohardness 'of ore J!linerals. Pep~r 68-64, Geol. Surv. Canada. " .... ~':." .. ;;,., :<;' ;-,~"i~ ::\i','.;·

RAMDOHR.;:.::P~ ';-:l969~~ "The' ore rn:i.I1erals and their intergrol;..n:hs. ~s5,iOxford. .

Pergarrcn

UYTENBOG.t\ARDT., W. and BURKE, E.A.J. ~ 197L Tables for the rnicros0opic identification·of ore minerals. 2nd edn., Elsevier Pub. Co., N. York. , , YOUNG, B. B. and Mlr.LMAN, A.P., 1963-64. Microhardness and deformation characteristics of ore minerals. Trans. Instn. Min. Metall., 73, 437-466. ,- .

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NEWS OF THE SOCIETY

Tentative Scheduie of GSM Meetfug, 1973 The following is a tentative schedule for the 1973 GSM maetings drawn up by Dr. S .H. Chan, the chainnan of the GSM sub-committee for organismg le~s/discussion sessions for 1973. The dates and venues have to be confirmed later and separate notices muld be sent informing members of these meetings as soon. 9S detiti Is are finalised.

July 6th 1973·.

Aspects of Australian geology by L. R. Beddoes, Venue:- Dept. of .Gec;>logy, lliiversity of Malaya, Kuala LumpUI".

August 4th 1973.

Seminar on Exploration and Evaluation. A ntmlber of speakers from the Mining industry will be invited. . Venue: - Dept. of Geology, UniverSiti Kebangsaan ,Kuala LUlIptn:'.

September 7th 1973

Island Arcs by R.'IJ. Murphy. Venue:- Dept. of Geology, University of Malaya, Kuala LUlIptir.

Deceni>er 1973 (1st or 2nd week)

JointOiscussion Meeting of the GSM and the Geological $urVeY of Malaysia. Venue: Geological ~~y, Ipoh. .. papers :1=9r p:resent~tion at this meeting are be:ing solicited. Those"wishing to present papers are requested to· ~te to the Secretary, GeologicaJ" Society of Malaysia, c/o Dept. of Geology, lliiversity of Malaya. The papers could be on any aspects. of the Geology of" Southeast i Asia " (including· Ivfalays:4t) or on related:. and :relevant topic~.

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February 1974

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Annual General Jv'"eeting. Venue: - Dept. of Geology) Unive:r!Sity of Malaya. It is likely that the AGM,· like in previoUf? years would be preqeeded by a discussicn neting.

In addition, a field neeting in South Johore is being planned, possibly a joint neeting with the newly formed Southeast Asia Petroleum

Exploration Society based in Singapdre.The GSM Field Trip Chairman for 1973 is Dr. P.H. Stauffer. Any other ideas and suggestions for neetings are welcone.

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Proceedings, Regional Conference on the Geology of Southeast Asia (COllection of Papers) Edited Py .B.K. Tan. Bu1le~in 6 332 pages.•. This BuJ.l~tin.,. ~ts. cpntents. given below, is expected. to .be available in JulY'"':t973-. ·:ml:·part.icipants at t;he conference will' receiye a free copy.' . Metribers 'of the Society can purcha.se this Bulletin at a:'reduced rate •. : An oI'derform is -enclosed together With this Newsletter. Contents Fref~~ •

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REGIONAL TEcroNIC: ~RK

SEcrION I :

Tect9~cs of the Indonesian Region ..•... ~ •• '.• W.' Harnil"4on

Tectonics and Oil Prospects of the Moluccas, Eastern ..." In..donesia ~ E. AD Gcibi, Jr 0

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Tectonic Franework and Evolution of India •••••••.•••••••• •••••••••• ~ .i •••••••••••• M. S. Balasunq,aram&D.K.Ray .'::'.:. 17 The

Mqni1a Trench - West Taiwan Foldbelt: A"F1ip~d' '..." ~.:" . , '.', .' Subduction Zone " ................... ;,. R.~.oJ.·· MurphY " .' ':' .. :"\

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Tectq¢.c Controls of Volcanism' and Conp1ex Movements . t Along the SUJIatran Fault System .•••• M. Posavec, D. Taylor, Th. Van Leeuwen & A. Spector

A~~rozoic·.;.$ypthe~i~.:

Tectonic Evolution of Stmdaland:' o

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A PreliminarY'S9n-thes:ls of the Geological EvoJ,ution ;~f "BUrma with Reference to the Tectonic Development 6f Sotrtheast Asia ~ a o· Mo Tbein : ..': . .'!'" .-: .. 0.- 0

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SEcrION 2 : . STRATIGRAPHIC CORREIATION ........::. "r: '.

The Early Stage of,the··Burnese • :

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Carboniferous and Pe:rnri.an Correlation in Southeast

.131 .

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The ~r;:'paieb;roic ~trgrep11Y' of Western part of ·the Southern Shan State, Burma •••.••.••••• M. L. Thein

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Late' ·re~f~."~logtd ''fiiS~brY. 9f. tl;e ~ontinental Shelf .: ~ __ ..... q;ft:, ~J9~stern Palawan, Phil~ppmes .• 0

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··'·~E-'.y:;"!:T~p~fsis,: E. V.

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Manalac, C.A. Reyes & L.M. Ote,

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Geology of the Region Sri Sawat - Thong Pha PhtDll .. Sangkhlaburi (Kanchanabur>i ProvincelThailand) ••••• •••••• 0

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Pennian Brachiopod Correlations for South-East Asia ••••• o. ~ ~ J. B. Waterhouse •

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GEOLOGY OF CONTINENTAL SHELVES

Geochronology of the Indian Precambrian ••••••••••••••••• •••• ••••• M.S.' Balasundaram & M.N. Balasubrahmanyan

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Quaternary Changes in Sea-levei in the South China Sea ~B. Biswa.s

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A Contribution to the Geology of Part of the Indonesian Tinbelt:·, the Sea;.A:rleaS Between Slngkep and Ban~ Islands-and Around the Karimata Isl~ds ••••••••••• G.J.J. Aleva, E~H. Bon, .J4J. Bossin& W.J. Sluiter

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On Pleistocene Migrat;ion Routes of"V~rtel:>I'at~' Fauna in Southeast Asia, •••••••••.• ~'~ '~' • ~,~'.". ~ ,S"' 'Sart6no,·· :~.:,::273·

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SECITON 5:

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REGIONAL MINERALIZATION , EXPLORATION.,. CONCEPl'S AND TECHNIQ~S" . . ,.. . ' . ' '. . . .

Large Scale Mineral Exploration and New Mining Development

Prospects in, ~doI)e,aia ••• ~ . ~ •••••••.••.•• S. Sigit '.'

'r11e' PrinBry Tifi Mineralization Patterns of West Malaysia • • • • • • • • • oO • • • • • • • D • • OOO.ooo • • o . o o • • oo KeF.G. Hos1
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297

The Exploration of the Nickel Laterite Deposits in Irian Baret, Indonesia .. ~ ..,•• .c.D. Reynolds, I. Havryll.lk, .,

S. Bastanan & S. Atnowidjojo List of Participants

309 323

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" Geology of the Malay Peninsula" appears The t~iley-Interscience book on the lIGeology of .th~ 'Milaya Peninsula (West· l'1alaysia and Singapore)", sponsored by the Geological Society of Malaysia, has f:tnany been published earlier this year. One writes' finally' not 'as a qriticism, but in··recognition of the! anount of time and work thaf'reve gone into it ~ The idea for such a book was first proposed to the Society, at its very inception in 1966/67, by De:rek J. Gobbett, long-time Hon. Sec. of the Society. Gobbett and Charles S. Hutchison were appointed by Council to edit the volume ( along with S. K. Chung, who later had to withdraw due to pressure of wo!%), and they obtained contributions of chapters from C.K. Burton, D.J. Gobbett, K.F.G. Hosking, C.S. Hutchison, C.R.Jones, P.H. Stauffer, and H,D. Tjia (as well as S,K. Chwg and B.N. Kooprrans who agreed to contribute but were unable to q~tinue). Gabbett and HutchisOn ·coordinated ,edited, and put together .t:h, various contributions into a coherent book, a task of considerable rriigrUtude and extending Qver a mmiber of years. The book, which· is a volune in the Regional Geology series edited by L.U.de Sitter, totals 438 pages, with about 200.illustrations, and is attractively printed in a large fomat. A coloured' geological map of the Malay Peninsula at scale 1: 1000000, cOIIq)iled by Gobbett, comes with the book ( This map is also available separately from the Society). The one tmhappy note is the price of the volume: US $45.00 Even in this day of rising book prices, that figure canes as a bit of a shock! Nonetheless, this vo1ul1e is the first comprehensive summa:ry of the area's geology since the classic but 1\&""' very outdated Geology of Malaya by J.B. Scrivenor, 1931, and is indispensible for anyone interested in the geology of the Malay Peninsula. For]J:elllbers of the Society wishing to purchase a personal copy, a lirnited number of copies will be available from the Hon. Sec. at 10% discount from the official price. P. H. Stauffer FINANCIAL NO'IE:.,. Although the book is pric~d at .'ps $ 45.00, it seems likely that the.Society would not gain fincmc.ia1~Y ~ this publication. Over the past years, the Society has bEien: naking a mmiber of paynents for t'yt>:ing, postage and other misce1lanepUs. iteniS-~ Under an arrangement made by the previous council, 'royalties . re~ulting from the sales of this rook Hould be shared between the·. Society, the editors of the book and the authors of the individual chapters.

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10 The emtors and authors would alSc. be receiving a number of free copies

of this book. The Society has received one free copy of this book which has been added to its Library. . EDITOR.I S NOTE.

: Coiments fromrrem1:;ers regarding this bock are we1COJIe for publication in future News1etlen;.

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(;SM Lc;>anFund . "Since the establishment of thisftmd in January 1973 (Geo!.· ...' Soc.: .Malaysia Newsletter, 40, p.12) loan ammmting to $ 4,450 has been approved. by council for nineteen students.· These students are all ih their Honours Year Geology course, either at the University of Nalaya or Universiti Kebangsaan. The 10c3ll; gr>anted vary in each case depending on the:stu4ents' financial standing and on his field area. The rnax:i.mum ·loan.'for.any student is$300/-~ .j



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'·:~ing the past year, t~~ has beel'bEfHh increase in the . number of resignations from members who have[transferred overseas. While th~~cnP- appreciates the position of such members, it would like to appeal LA-O support the society by continuing their membership even though they may nOt return to the Southeast Asia region in the near future. The Council feels that many of these members would still find it beneficial to continue·their meml;ership even though they canno·f attend neetings, sem:i.riars or conferences organised by the SocietY as .the Society's publication and other circulars would help them to .keep·up with new ·developnents and activities in this part of, the world. ... .. . ",

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New Members: Full· ·Members 1.

S. Bal.akrishnai1. 4. Inter-Consult 1st· Floor, 68·Jln Ampang Kuala Luinpur MAlAYSIA

Kuo Say Lee Department of Geology University of· AJ.Perta Edm::lnton 7, Alberta CANADA

2.

Chong Nai Hooi 5. Associated Mmes Sdn. Bhd. P.O.Box 2125 Kuala 'Lumpur'

Paul Riddell c/o Getty Oil Dev. Co. ·Ltd. 275 Alfred St. North, North Sydney, N. S. \ftl. 2060 AUSTRALIA""

MALA¥'SIA 3.

Kendall W. Sageser 6. United States Steel Int. (NY) Inc. 19 Parklane, Goodwood Park Hotel, SINGAPORE

Robert Alexander McTavish Atistralia:i1Petroleum Pty. Ltd. Box C1580, G.P.O., Perth 6001, WESTERN AUSTRALIA

west

Student Memters 1-

Faud/Tuah b. Wan Hassan Wisrna Selangor, Jalan University Petaling Jaya

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Goh Leng Siang Departnent of Geology Uni'f~.ity of Malaya Kuala LtDl'pur

2.

Tong Khai Wah Departrrent of Geology University of Malaya . Kuala Lumpur

8.

Harpaj an Smgh Balai Poils, Pasir Puteh Ipoh, Peral<

3.

Too Heng Keong Department of Geology University of Malaya Kuala LtDI1pur

9.

Ong Guan Bee 1 Jalan 14/38 Petalmg Jaya

4.

Abdul Hamid Moharnad No. 1 Jalan Raja Ali Kg. Bharu Kuala Lumpur

10.

Siti Zauyah bt. Darus No. 62 Jalan SS2/22 S.E.A. Park Petaling Jaya

12 5.

Shaharin b. Ibrahim Wisma Selangor Jalan University PetaJing Jaya

6 .L¢op:g Pheng San 782 Road 17/29 Petaling Jaya

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Ooi Aun Chy~" Depart:nent Geology" University of Malaya

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Kuala LtmipUI"

12. . Teoh Seng Keat No .. 8 Jalan 12/16B Petaling Jaya

Subcriptions The Treasurer would like to remind those members who have not yet paid their subcriptions for 1973 to do so at the earliest. After 1st ~h 1973, the dues are: Full.or.Associated Member M$ 17.00

Student Member (A) M$ 8.00

Student Member (B) (who will .receive GSM Newsletter and . Notices 0r¥-y) . You:[. cooperationWiil be appreciated

M$2.00

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EMPLOYMENT OPPORTUNITIES University of Singapore Applications are invited for teaching appointnents in the Department of Geography. Preference will be given to candidates with a higher degree, and suitable teaching and research experience in one or JIDre of the following areas: Soil Science Envirorunental Managenent - urban geography Geology/Marine Geology Air-Pollution Meteorology - climatology Oceanography Cartogre.phic Production Biogeogre.phy Candidates should write to: The Registrar

University of Singapore Singapore 10 giving curriculum vitae (bio-data), with full personal particulars, and also the names and addresses of three referees. Candidates rust state their area! s of interest in their applications. Salary in the range of $1000 - $ 2600 per JIOI'lth depending on qualifications and experience, and the level of appointm:mt offered. An annual allowance of one nonth t s salary is payable accoro:ing to University's regulations 0

leave, provident fund, medical and other benefits are available.

GEOLOGICAL SOCIETY OF MAlAYSIA Publications: All prices given are in Malaysian dollars and include surface postage. Newly published:

Bulletin 5 (1973) The search for Tungsten Deposits. K. F. G. Hosking 7Op. Price $10.00 ($5.00) GEOLOGICAL MAP OF 'IRE MALAY PENINSULA (1:1000,000, coloured) corrq:>iled by D.J. Gobbett March 1972 Price: $4.00 (folded flat; rolled, extra at cost) AffiTRAcrS OF PAPERS: Regional Conference on the Geology of Southeast Asia, Kuala LtllIPur, March 20-25, 1972. 64p., 8 figs., tables, many extended abstracts. February 1972. Price: &6.00 ($3.00)

Also available:

BULLETIN SERIES 1968 Bulletin Bulletin also Bulletin Bulletin

(Prices to GSM

1 (1968): 79p. 2 (1968): 152p. in hard cover for 3 (1970): 164p. 4 (1971): lOOp.

~rs

$ 3.00 $10.00 $15.00 $10.00 $10.00

($2.00) ($5.00) ($7.50) ($5~OO)

($5.00)

are given in parentheses)

Other publications of the Society include a bi-nonthly NEWSlETI'ER, PRESIDENTAL ADDRESSES (1968-), and sone miscellaneous papers, abstracts, and reprints (full list with prices on request). A1x>ut the Society: The GSM has a nernbership of about 300 geologists, mainly in Malaysia and Singapore, but including a scattering of geologists interested in Southeast Asia :in many other co'lIDtries. Annual dues are Mil15.00 and there is an entrance fee of M$5.00. The Society's publications are available to members either free or at reduced price in general. The Society's Editor will gladly consider manuscripts on the geology of Southeast Asia or neighbouring regions, or on related and relevant topics, for publication in the Bulletin Series or as short 'Geologic Notes' in the Newsletter.

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