The Jurong formation is a sedimentary rock formation that covers the southwest portion of the island of Singapore. The formation was laid down in the late Triassic to early or middle Jurassic geologic periods. It consists of dolomite, limestone, mudstone, sandstone, shale, and conglomerates that have been acutely folded and faulted as the result of tectonic plate movement.
References
Jurong Formation Wikipedia(Text) CC BY-SA