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Abstract
Genetic studies of South Asia's population history have led to postulations of a significant and early population expansion in the subcontinent, dating to sometime in the Late Pleistocene. We evaluate this argument, based on new mtDNA analyses, and find evidence for significant demographic transition in the subcontinent, dating to 35–28 ka. We then examine the paleoenvironmental and, particularly, archaeological records for this time period and note that this putative demographic event coincides with a period of ecological and technological change in South Asia. We document the development of a new diminutive stone blade (microlithic) technology beginning at 35–30 ka, the first time that the precocity of this transition has been recognized across the subcontinent. We argue that the transition to microlithic technology may relate to changes in subsistence practices, as increasingly large and probably fragmented populations exploited resources in contracting favorable ecological zones just before the onset of full glacial conditions.
Footnotes
- 1To whom correspondence should be addressed. E-mail: michael.petraglia{at}rlaha.ox.ac.uk
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Edited by James F. O'Connell, University of Utah, Salt Lake City, UT, and approved May 27, 2009
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Author contributions: M.P., N.B., and R.K. designed research; C.C., M.H., G.C., P.D., D.F., H.J., S.J., T.K., J.K., M.M.L., M.M., R.R., and L.A. performed research; and M.P., C.C., N.B., M.H., D.F., and T.K. wrote the paper.
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The authors declare no conflict of interest.
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This article is a PNAS Direct Submission.
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This article contains supporting information online at www.pnas.org/cgi/content/full/0810842106/DCSupplemental.
Population increase and environmental deterioration correspond with microlithic innovations in South Asia ca. 35,000 years ago
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