This rock specimen is found near the hill of the Borneo trunk road five kilometres after the Sadong Bridge towards Sri Aman (65km from Kuching). It is one of the hardest rocks in Sarawak, the Serian Volcanic lava rock, which was formed during the Triassic period (about 200 to 250 millions years ago). It is harder than the granite rock and is difficult to drill through using ordinary boring machine.
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