Abstract. Prolific Tertiary sedimentary basins are mainly located in Western Indonesia. They have previously been described as “ideo-geo-synclines”, and are situated around the periphery of a supposed pre-Tertiary land-mass the "Sunda Shelf”, now largely covered by shallow epicontinental seas, (Java Sea, South China Sea). Outward they are bordered by the Inner Volcanic island arc. Recent extensive marine seismic investigations and subsequent drilling have confirmed the extension of some of these basins offshore (e.g. North Sumatra, West Java, East Java and East Kalimantan). More important, however, these surveys have revealed that the “Sun Shelf” which supposedly served as source of sediments during the Tertiary, actually consist of numerous sedimentary basins and intervening uplifts, leaving the area between Bangka-Billiton and Natuna-Anambas Islands as the Sunda-land proper. These uplifts served as source of sediments and some are represented by pre-Tertiary islands, e.g. Bangka, Billiton and Karimun Jawa. Basement block-faulting is apparently responsible for the development of these basins, and controlled depositions as well as tectonics of the Tertiary cover. Further offshore exploration has also confirmed the presence of Tertiary sediments between the Inner Volcanic islands (c.q. Sumatra) and the outer non-volcanie arc (c.q. Nias). There is no sufficient data to date to describe offshore sedimentary basins is eastern Indonesia. Marine geophysical surveys and drilling are still in progress at present. Numerous offshore drilling locations are scheduled for several years, so that it is still too preliminary to discuss the broad geological implications.
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