ISSN 0866 - 7381

Jo u rn al of

GEOLOGY
SPECIAL ISSUE

PROCEEDINGS OFTHE INTERNATIONALSYMPOSIUM
GEOLOGYOFSOUTHEAST ASIA
ANDADJACENT AREAS
1-9November 1995. Hanoi

Series B

—

GEOLOGICAL SURVEYOF VIETNAM
HANOI

5-6

1995


G.R. SHI & ZHAN LI-PEI
A m ixed m id-P erm ian m arin e fauna from Y anji area, northeast C hina and its
bearing on the bipolarity o f w estern Pacific Perm ian m arine biogeography

164

ROBERT B. STOKES

165

Revised tim ing o f the indosinian orogeny: the echinoid test

SUN KEQIN
165

Evolution and Ecology o f the C athaysia flora in Asia

PHILIPPE TAQUET, BERNARD BATTAIL, JEAN DEJAX, PHILIPPE RICHIR,
PHOUVONG SAYARATH & MONETTE VERAN
First discovery o f D inosaur footprints and new discoveries o f D inosaur bones
in the Lower C retaceous o f the S avannakhet province. Laos

TONG DZUY THANH, HOU HONGFEI, ТА HOA PHUONG & NGUYE

167
N HUU HUNG

On the D evonian S tratighaphy o f Southeast Asia

168

TONG JINNAN & YIN HONGFU
Lower T riassic Sequence S tratigraphy o f Lower Y angtze. C hina

169

KATSUMI UENO, KOICHI NAGAI, NIKORN NAKORNSRI & TETSUO SUGIYAMA
Fusulinacean faunal succesion across the C arboniferous-Perm ian boundary

in the Ban Na D in Dam section o f the Loei area. N ortheast T hailand

170

VU KHUC
A m m onoid zonation o f T riassic and Jurassic in V ietnam and adjacent areas

171

THANIS W ONGWANICH & CLIVE BURRETT
T he U pper O rdovician deeper w ater Strom atolites of T hailand
and its correlation in SE Asia

172

WANG CHENG-YUAN
Conodonts o f P erm ian -T riassic boundary beds and biostratigraphy boundary

173

GORDON D. WOOD
Im plication o f Fungal and Fungal-like rem ains in the
Perm o-T riassic extin ctio n horizon: cause or effect ?

174

GORDON D. WOOD
Identification o f depositional pattern s and therm al history using palynological techniques

174


A.J. WRIGHT
D evonian tetraco rals from Padaukpin, M yanm ar

175

GAVIN C. YOUNG
M iddle Paleozoic vertebrate biogeography o f east A sia-east G ondw ana

176

ZHANG KEXIN, DING MEIHUA, LAI XULONG & LIU JINHUA
Conodont sequence and its global correlation o f Perm ian-T riassic boundary
in M eishan section, chan g x in g . Z hejiang province

177


Journal of GEOLOGY

EDITORIAL OFFICE

Series B, No 5-6/1995

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EDITORIAL BOARD
Editor-in-chief: TRẦ N VĂN TRỊ
M em bers: LÊ Đ Ú t AN, PIIẠ M VAN AN, NGUYEN XUÂN BAO, NGUYEN GIAO, v ũ NGỌ C
HẢ I (Deputy Editor-in-chief), v ũ KHÚC, (Deputy Edit or-in-chief), NGUYEN NGHIÊM MINH.TẪ NG
MIJỜ I, VÕ CÔNG NGHIỆ P, NGUYỄ N TIẾ N THÀNH, TỐ NG DUY THANH, TRAN MINH THẾ , PHAN
TRUỠ NG THỊ , PHAN C ự TIẾ N , LÊ VẦ N TRẢ O, NGUYỄ N KHẮ C VINH, NCỈ UYẺ N TRỌ NG YÊM
S ecretary : BÙI ĐỨ C THẮ NG

This issue is designed for the publication o f proceedings and abstracts o f papers presented in
the International Symposium on Geology o f SE Asia and adjacent areas (1-9 November 1995, Hanoi),
organized by the VietnamNational Committee for IGCP, Geological Survey of Viet Nam and IGCP
Projects 306 (Stratigraphic correlation in SE Asia), 321 ( Gondwana dispersion and Asian accretion) 359
( Correlation of Tethyan, Pacific and Gondwanan Permo-Triassic) Coleaders with the co-operation of
the Geological Association of Viet Nam and Hanoi National University.


O N T H E D E V O N IA N S T R A T IG R A P H Y O F S O U T H E A S T A SIA
(South C hina, Vietnam , L ao s, Cam bodia, T hailand and M alaysia)
TONG-DZUY THANH1, HOU HONG-FEI2, TA HOA PHI JONG1 & NGUYEN HUU HUNG3
1 .Vietnam National University, 90 nguyen Trai Sir., Hanoi
2. Institute o f G eology, 26 Baiwanzhuang Road, Beijing 100037, China
3. Research Institute o f Geology and Mineral Resources, Thanh Xuan. Dong Da, Hanoi
The D evonian rocks are d ifferently know n in Southeast Asia. In South C hina (G uangxi,
Yunnan Provinces), V ietnam and Laos they are w idespread and attract a great num ber o f w orks of
geologists. The exposures o f them in T hailand and M alaysia are also studied and identified. In
C am bodia there are only the supposed D evonian rocks.
According to the existing data the D evonian o f these regions may be exam ined in the
follow ing suitable areas.
- South China and North Vietnam area. The D evonian sequences exam ined in this area are

w idespread in G uangxi, East Yunnan (China) and N orth Vietnam. In the tectonic aspect this area
considered as the m ain part o f the South China block. In this paper the Song Ma fault is taken as
the southern border o f it, instead o f the Red R iver one in the conceptions o f the other authors.
- Indochina area. T his area spreads from the territories o f the N orth part o f C entral Vietnam
tow ard to Laos and East T hailand. C am bodia is also considered as a part o f this area.
- Shan-Thai area. The D evonian exposures o f this area are observed in W est Yunnan (C hina),
main land o f T hailand and its peninsular. C onventionally, the D evonian o f M alaysia will be
exam ined in the fram e o f this area.
Due to the lack o f data the D evonian o f other areas o f Southeast Asia w ill not be presented in
this paper.

Lower Devonian
South China and North Vietnam area
I he sim ilarity o f the Low er D evonian facies and fauna o f the South China and N orth Vietnam
area is well studied and proved. In both territories the low erm ost beds o f D evonian consist o f the
rocks ot the "Old R ed Sandstone" facies (Lianhuashan Form ation in South China and Sika
Form ation in N orth V ietnam ). The abundance o f the endem ic faunas o f both Invertebrates and
V ertebrates is the m ost distin g u ish ed event o f Low er D evonian in this area.
The suitable stratig rap h ic units o f them m ay be clearly correlated. Some different opinions are
being the object o f the discussion. On o f them , for exam ple, is the aged and facial identification
of the tonkinensis bearing beds.

Indochina area
Lower D evonian in this area is rather different from the South C hina and N orth V ietnam one.
It consists m ainly o f terrigenous rocks and the Upper part o f w hich corresponds to the open
m arine iacres. The fossils are poorly co llected, but most o f them are the representatives of
Brachiopods and som e C orals in the m arl lens. The "Old R ed Sandstone" facies occurs only in the
Mid ot Central Vietnam (Tan I.am Form ation) and adjacent localities o f Laos.

168



An Upper Silurian - Low er D evonian beds bearing pelagic fauna was described in the N orth of
Central Vietnam. This inform ation requires the restudy in the near future. The sim ilar sequences
of the low erm ost beds o f D evonian are observed in Laos.

Shan-Thai area
In this area the Low er D evonian consists m ainly o f the deep water facial rocks w hich
expressed them selves in its containing (irap to lites, D acryoconarids and rare thin-shelled
Brachiopods. They are w ell know n from Yunnan, N orth T hailand and Langkaw i Islands of
M alaysia. T hanks to the ex istence o f pelagic faunas the correlation o f their bearing beds is well
reasonable.
According to the data o f IIou H ong-fei (1994) a m ark o f the continuous Silurian-D evonian
boundary was studied in w estern Yunnan.

Midlie and Upper Devonian
- From the Low er stage o f the M iddle D evonian the differentiation o f the facies and the faunas
is lesser and lesser d istinctly. The carbonate rocks w ith the open m arine fauna are m ore and m ore
w idespread in the Southeast Asia. F;or exam ple, apart from the South China and N orth Vietnam
area this situation is well expresses also in C entral Vietnam , Laos and Last T hailand. From this
tim e the endem ic fauna becam e overshadow am ong the benthic com m unities.
- The carbonate com ponents are m ore abundant in the sequences o f G ivetian and lim estone
plays the m ost im portant role in the com position in a lot o f sections. The m egafossils such as
('o rals, Brachiopods, Bivalves, T rilobites and others are very com m on in the shallow facial
form ations, w hile the pelagic faunas are the m ost indicated fossils o f the deep w ater facies,
particularly in the sequences o f siliceous lim estone. At the G ivetian tim es the cosm opolites are
com m on in the benthic faunas, endem ic genera are very rare.
A hiatus was observed in the M iddle D evonian sequence o f South China and N ortheast of
Vietnam. It falls approxim ately in the interval betw een H ifelian and G ivetian.
- Upper D evonian seem s to be in the restrictive spread in m any areas. In South China, Vietnam

and Laos the lim estone form ations are com m on in the sequences. The stripped and nodular
lim estone may consid er as a m arker o f Upper Frasnian and Fam ennian in several areas. In W est
Yunnan and T hailand, M alaysia (Shan-Thai area) the Fam ennian is absent or takes part in the Red
Beds facies o f Upper D evonian - Low er C arboniferous sequence. The continuous D evonian C arboniferous boundary is w ell described in G uangxi, near G uilin town. In V ietnam this boundary
also falls in the continuous equence o f lim estone.
The stage boundar; identificatio n o f D evonian is b etter studied in South China and then
in less level in N orth Vietn. m

L O W E R T R IA S S IC SE Q U E N C E ST R A T IG R A P H Y
O F L O W E R Y A N G T Z E , C H IN A
TONG JINNAN AND YIN HONGFU
China University o f (leosciences. Wuhan, 430074
1. Based upon the com prehensive studies o f the various strata in num erous sections across
different paleogeographic facies, the Low er T riassic o f low er Yangtze is com posed o f four third-

169