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. 2013 Mar 18;8(3):e58999. doi: 10.1371/journal.pone.0058999

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© 2013 Li et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A. Archaeostratigraphy of the QH2 archaeological site, showing from the left to the right stratigraphy photo, archaeostratigraphy with indication of mollusk (solid circles) and age (solid rectangle) sampling layers, description of the archaeostratigraphy of the QH2 site. B. Field photo of the QH-H3 archaeological site with mollusk (solid circles) and age (solid rectangle) sampling layers indicated.