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. 2016 Nov 2;11(11):e0164793. doi: 10.1371/journal.pone.0164793

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© 2016 Rosso 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 credited.

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Fig 9 — LG: lower grindstone; UG: upper grindstone; ferr. rock: ferruginous rock. The objects' identification number is the same as presented in Figs 4–8, 10 and 11, Tables 1–5, S1 and S2 Figs, S1 Table, S1 Text.