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. 2017 Mar 3;7:42869. doi: 10.1038/srep42869

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) the location of Su Carroppu rockshelter, Sardiania (Italy) and (b) pictures of the 3 samples used in this study. The map is plotted using data available on http://webgis.regione.sardegna.it/Download/raccolteCartografiche/modelliDigitaliTerreno/DTM10m/.The material is licensed under the Creative Commons attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/legalcode). The map was processed with Corel Photo-Paint 9 v9.439 (http://www.coreldraw.com/en/product/graphic-design-software/? topNav=en, version 9.439 licensed to CL) and modified with Photoshop CC (2015.5).