Bulletin of the Geological Society of Malaysia, Volume 8, Dec, 1977, pp. 75 – 87
Robertson Research (Singapore) Pte. Ltd. Ayer Rajah Industrial Estate, Block 6, 55, Ayer Rajah Road, Singapore 20
(Submitted 6 August, 1974; revised version accepted 25 July 1975)
Abstract: A geological reconnaissance survey of Pulau Tekong revealed the presence of three lithological units: the Bukit Resam Member of the Jurong Formation, Quaternary Alluvium and some. thermal metamorphic rocks. The stratigraphic relationships between the metamorphic rocks and the Jurong Formation are uncertain.
The oldest sediments are possibly of Lower Triassic age and were subjected to thermal metamorphism by an igneous intrusion. Deposition was reestablished afterwards and the clastic sediments of the Bukit Resam Member of the Jurong Formation were laid down in a molasse facies during the Upper Triassic. After a long period of uplift and non-deposition in the later Mesozoic and Tertiary, Quaternary alluvium was deposited as a result of galcio-eustatic sea level changes.
The Triassic rocks are broken up by faulting and folding and in view of the small catchment area and the relatively high amount of Fe-ions dissolved in the water the existence of a large and good quality aquifer is unlikely.