Abstract
This chapter discusses the geology of the West Crocker and Temburong formations. The lower part of the Crocker Formation is of Palaeocene to Middle Eocene age. Crocker Formation outcrops have yielded only arenaceous foraminifera of little age significance. It is accurately dated Oligocene to Lower Miocene only in the Sipitang–Beaufort–Tenom Gorge district. The Crocker Formation exhibits all the features of a major turbidite fan system, but it is difficult to accept that the formation from the Palaeocene to the Lower Miocene as a single system, and unconformities are suspected. The various sedimentary types within the Formation summarized here are: flysch sequences, laminite sequences, red and green mudstone, mass–flow sandstone, and slumped zones. The Temburong Formation occurs in eastern Brunei and south of Beaufort, is an important face of the upper part of the Crocker Formation. Palaeo–current measurement pattern is simple, indicating that the sandstones of the Crocker Formation were deposited as an integral part of a major turbidite fanshaped trough directed towards the north. Therefore, the Crocker Formation structure has important regional variations.
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