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Reference.org
Two layer hypothesis
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<p>The 'two layer hypothesis', or 'two layer model', states that eastern Asia was initially occupied by <a href="/facts/Australopapuan/DLwJb5yg">Australo-Papuans</a> before being replaced by Neolithic agriculturalists, who possessed East Asian cranial morphology. Cranial morphometrics and dental characteristics of human remains were cited as evidence for the hypothesis. </p>