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.
About 15 million years ago, this area lay beneath a shallow sea where sand was deposited layer upon layer. Waves and tides produced a variety of sedimentary structures such as cross-bedding, ripple marks, channels and flaser bedding. Marine life was abundant at the time, leaving both body fossils and trace fossils in the seabed.
Today, visitors can see a rocky coastal cliffscape that preserves evidence of all these ancient processes. Sea-water erosion has sculpted striking features such as tafoni, wide wave-cut platforms, steep cliffs and headlands. Thick rock layers here reveal infilled tidal channels, and the site is especially rich in trace fossils from shallow-marine organisms, including vertical burrows such as Ophiomorpha isp. and Teichichnus isp. show the former dwellings of these creatures.
The site’s most distinctive feature is its tafoni, rarely seen elsewhere in Malaysia. These cavities are shaped like stream channels and resemble the folds of a human brain, unlike typical tafoni. Sedimentary structures such as trough cross-bedding and current ripple marks are also clearly displayed. Some rock surfaces appear bright orange due to lichens or fungi that contribute nutrients for photosynthesis.
This scenic headland not only safeguards high-value geological heritage but also offers great potential as a visitor attraction where people can relax while learning about Earth’s history.
The curved, brain-like hollows on the rock are known as tafoni or honeycomb weathering. Their formation begins when salty sea spray seeps into the pores of sandstone. As the water evaporates, salt crystals are left behind and continue to grow with repeated spraying. The expanding crystals push apart surrounding sand grains, weakening the rock. Wind and rain then wash away the loosened grains, creating cavities that enlarge as the process continues. This is an example of chemical weathering responsible for the unique tafoni at Tanjung Batu.
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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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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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.
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