...Mazlan B. H. Madon Abstract Berthierine oolitic ironstones have been found in the subsurface lower Miocene strata of the Tenggol Arch area, offshore Peninsular Malaysia. The ironstones occur within a 30 to 50 m-thick laterally extensive unit of very finely laminated to massive dark green mudstone...

... ). The section supports Hamilton’s inference that basement rocks are involved in the formation of the Tenggol arch. The intrabasin high indicated at sonobuoy 292-V36 in Section AB is not shown in published isopach maps. There, the occurrence of a 4.6-km/sec (15,090-ft/sec) velocity horizon at so shallow a depth...

... to the east of Peninsular Malaysia, separated from the Malay Basin by the Tenggol Arch (Figures  1 – 3 ) to the northwest, and structurally contiguous with the West Natuna Basin of Indonesia to the northeast. To the west and southwest, the basin is bounded by the Pahang Platform and the Johor Platform...