Text and Data Mining valid from 2018-12-01
Received: 27 June 2018
Accepted: 18 November 2018
First Online: 5 December 2018
Ethics approval and consent to participate
: Not applicable.
: S. Konik, <i>Centre National de la Préhistoire</i>, consents the publication of the photographic picture presented in Fig.InternalRef removed. The DRAC <i>Nouvelle Aquitaine</i> (Bordeaux, France) consents the use of temperature and CO<sub>2</sub> concentration data recorded during sampling period.
: The authors declare they have no competing interests.
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