The authors identify natural bitumen on stone implements dating to 70 000 BP. It is proposed that this represents residue from hafting, taking the practice back a further 30 000 years from the date previously noted and published in Nature . The bitumen was tracked to a source 40km away, using gas chromatography-mass spectrometry and carbon isotopes.
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Boëda et al. (2008) studied this question.
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