Deep marine sedimentary deposits exceeding 2,000 m depth, comprising dark grey to reddish mudstone with interbedded siltstone and medium-grained sandstone. Rich in deep-sea trace fossils, making this a highly valuable scientific geosite.
At this geosite you can observe deep-marine sedimentary deposits formed 33-23 million years ago at depths exceeding 2,000 metres. They are represented by a succession of red to dark grey mudstone layers overlain by interbedded siltstone and medium-thickness coarse sandstone.
Geologically, the outcrop is one of the best examples of the Temburong Formation, showing the development of several deep-sea fan lobes. The Bouma sequence is clearly visible here, characterising deposition by dense, sediment-laden turbidity currents. Each flow phase was deposited gradually as the current weakened, producing upward-fining sediment profiles within each layer.
This geosite also displays numerous trace fossils, evidence of the activity of organisms that lived on the deep-sea floor about 30 million years ago. The diversity and excellent preservation of these trace fossils, together with the complete deep-marine turbidite succession, give the site outstanding scientific heritage value. The traces can be seen on the surfaces and within the layers of sandstone, showing various forms (winding, straight and honeycomb-like) that reveal behaviours such as feeding and burrow construction.
Trace fossils recorded at this site include Megagrapton isp., Ophiomorpha isp., Paleodictyion isp., Gyrophillites isp., Spiroraphe isp., Zoophycus isp., Helminotraphe isp., Scolicia isp. and Cosmoraphe isp.
River channel deposits from approximately 15 million years ago, part of the lower Belait Formation. Fresh outcrops exhibit near-horizontal thick sandstone layers. A scenic and diverse coastal landscape with alternating sandy and rocky shorelines, featuring sea caves and arches in several locations.
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Thickly bedded sandstone layers representing ancient tidal-influenced river channels. Abundant shallow marine trace fossils such as Ophiomorpha isp. and Teichichnus isp. are visible. Exceptionally well-developed tafoni (honeycomb weathering structures) formed by salt spray from the sea, creating intricate voids on coastal rock surfaces.
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Exposing high-quality, fresh rock surfaces showcasing large-scale cross-bedding with embedded coal fragments, a unique feature not recorded elsewhere in Malaysia. Characterised by a broad tidal flat displaying current and wave ripple structures at low tide, with visible Belait Formation strata extending offshore toward Pulau Ular, and a natural sea arch sculpted by wave erosion.
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