Chia, Stephen (2005) The Obsidian Industry At Bukit Tengkorak Sabah, Malaysia. Project Report. Universiti Sains Malaysia.
In 1994-95, archaeological research was undertaken by a joint Centre for Archaeological Research Malaysia and Museum Sabah team at Bukit Tengkorak, a Neolithic site in Sempoma, Sabah (Figure l). Geologically, Bukit Tengkorak forms part of the rim of a 2 kilometer-wide volcanic crater, surrounded by numerous isolated hills and mountains, most of them representing sites of extinct volcanoes ranging from Pliocene to Quaterrary in age (HD Tjia, personal communication, Kirk 1962, Lee 1970).
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