| Summary: | The deposition of the Paleogene sediments in Central Sarawak occurred in four successive
stages, its axis of depocentre generally advancing and younging to the northeast in response to progressive
southwest subduction-accretion of a Mesozoic oceanic lithosphere and its sedimentary cover under West
Sarawak. The younger sediments were deposited on top or in front of an older accreted sediments. The
timing of deposition and accretion is uncertain due to lack of precise age indicators. However, based on
regional considerations, the accretion is interpreted to have occurred sometimes during the Early
Paleocene, Middle Eocene, Upper Eocene and Upper Oligocene, respectively, along major fault zones,
producing four tectono-stratigraphic units. The older sediments were subjected to polyphase deformation
as younger units were accreted.
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