Abundant deep-marine trace fossils of Paleodictyon isp., a honeycomb-patterned trace linked to food-farming behaviour (Agrichnia), exposed on a wave-cut platform along the Tanjung Punei coastline.
The Tanjung Punei Geosite exposes layers of the Temburong Formation, which were deposited in a deep-marine environment about 33 million years ago. These rock layers are well exposed, forming a clear wave-cut platform along the coastline.
The main highlight of this geosite is the abundance of deep-marine trace fossils, particularly Paleodictyon isp. This type of trace fossil, with its hexagonal or honeycomb-like pattern, indicates the activity of marine organisms in trapping and obtaining food (Agrichnia). Other trace fossils, such as Spiroraphe isp., can also be found here, making this geosite an important record of ancient deep-sea ecosystems.
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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