109 
imestones and 
detritics are 
Larites (with 
riassic age. 
land, Miniloe 
o series are 
linas, algae, 
dstone, tuffs, 
the oldest 
s by further 
Hence, mainly 
uperimposition 
as the strong 
'es impossible 
5 same problem 
niddle Miocene 
pped when the 
of the two 
jhiolites and 
deduced only 
ve domains of 
; of the rocks 
acturation is 
are N40-N170, 
or trends are 
N60, N120. 
are distinctly 
ition compared 
the strongly 
nized in the 
photographs. 
this fault on 
to sub-recent 
which conceal 
^logical units 
outlined by a 
ts interpreted 
confirm the 
e. This might 
lugan Fault to 
uan Bay some 
rference with 
bs or reverse 
suggest a second folding process which corresponds 
to a late Miocene phase. 
South-east, the contact between ophiolites and 
Quaternary alluvia shows rectilinear segments 
roughly N60E and N-S. They are referred to as 
faults. The presence of alluvial fans suggests 
important vertical movements which could be 
explained by late extension faults at the back of 
theo verthrust. Left lateral shifts along some N-S 
faults are in agreement with observations at the 
Ulugan and Rizal faults. 
CONCLUSION 
For this synthetic map, remotely sensed documents 
are used as a basis to homogenize, verify, 
reevaluate and extrapolate all the elements which 
are finally reported. Satellite imagery is a useful 
tool for integrating such diverse features as field 
observations, seismic and well data and 
bibliography. 
Faults, fractures and joints are clearly expressed 
on the images so that the tectonic pattern is 
completed. Some hypothesis made on images about the 
succession of phases, once localy confirmed by 
microtectonics, can be extended to broad areas. On 
such a map, it is important to clearly discriminate 
confirmed and assumed data. Concerning Landsat 
imagery, which is quite inadequate to tropical areas 
it is shown that band 7 can bring useful 
information. Good results in both lithology and 
tectonics are mainly based on physiographic 
observations. As already mentioned by Floyd and 
Sabins (1980), the SIRA radar images provide good 
lithological studies, but slopes and drainage 
patterns are insufficiently detailed for precise 
tectonic interpretation. 
However dense vegetation and alteration of rocks 
may induce many artefacts. For example, two 
different series, with a similar lithology have the 
same erosional soil and hence the same aspect on the 
images which prevents any differentiation. 
For such unknown areas, the use of MSS imagery is 
very helpful in wide recognition work and it is an 
interesting complement for synthesis study. However 
many cases clearly show that field checking is 
absolutely necessary. For this specific area, new 
remotely-sensed features are obtained, i.e. the N-S 
Rizal fault in north Palwan is clearly argumented 
and this may reinforce the importance of N-S faults 
in the area. The join pattern has been completed, 
although some elements of difficult interpretation 
require further investigations. Boundaries of the 
lithological units characterized and redated by 
field survey are more accurately mapped. 
Mindoro to the Asian mainland and its significance 
in the evolution of the South China Sea. Bull. 
Amar. Ass. Petrol. Geol. 66. 9:1355-1383. 
Leong, K.M. 1977. New age from radiolarian 
chert-spillite formations. Geol. Soc. Malays. 
Bull. 8:109-111. 
Letouzey, J. L. Montadert & C. Muller. 1984. CIDOG - 
Geology of Palawan and the Island of Balabac 
(field work report 1983-84). Report IFP 27324. 
Muller, C. & C.J. Daniel. 1981. Stratigraphical and 
paleo-environmental studies (Oligocene-Quaternary) 
in the Visayan Basin, Philippines. Newsl. 
Stratigr. 10. 1:52-54. 
GEOLOGICAL MAPS AND REPORTS 
1982 - Geology and mineral resources of the 
Philippines. Bureau of Mines and Geo-Sciences 
Ministry of Natural Resources (1 map 
1:2 500 000 scale). 
1963 - Bureau of Mines - Philippines (geological map 
1:1 000 000 scale). 
MSS IMAGES 
52 
2 
21 
79 
1 
30 
78 
3 
25 
78 
53 
12 
24 
72 
54 
3 
30 
79 
3 
31 
77 
with a N30E 
seems to be 
' the second 
which affect 
nterpreted as 
nic event, 
deviations of 
fracture zone 
n on previous 
tectonic event 
d during the 
one). Many 
nations. 
d only in the 
nd bed-tracks 
ative folding 
'olding event, 
leir asymmetry 
REFERENCES 
Balce, G. 1979. Explanatory text for the tectonic 
map of the Philippines archipelago. 
Floyd, F. & J.R. Sabins, 1983. Geologic 
interpretation of space shuttle radar images of 
Indonesia. AAPG Bull. 67. 11:2076-2099. 
Fontaine, H. 1979. Note on the geology of the 
Calamian Islands, North Palawan, Philippines. CC0P 
News Letter. 6. 2:40-47. 
Fricaud, L. 1984. Etude géologique et structurale de 
la marge ouest Palawan (Mer de Chine méridionale). 
Thesis. Paris. 
Hashimoto, W. & T. Sato. 1973. Geological structure 
of the Northern Palawan and its bearing on the 
geological history of the Philippines. Geology and 
Paleontology of South East Asia. 13:145-161. 
Holloway, N.H. 1982. The stratigraphy and 
relationship of Reed Bank, North Palawan and