“…Fourthly, just three diterpenoids marker compounds were found in the tool samples. The identification of a full suite (five or more) of Pinaceae resin-related acids from historical and archaeological samples have been described (Bailly et al, 2016;Burger et al, 2013;Egenberg et al, 2002;Fox et al, 1995;Helwig et al, 2008;Hjulström et al, 2006;Modugno and Ribechini, 2009;Rageot et al, 2016;Regert, 2004;Regert et al, 2005;Ribechini et al, 2009Ribechini et al, , 2008 , and such reports provide stronger evidence for the interpretation of ancient Pinaceae resin. Our results are similar to other findings that identify Pinaceae resin on the basis of two to four altered abietic acid marker compounds (Bianchin et al, 2009;Čukovska et al, 2012;Giachi et al, 2013;Pérez-Arantegui et al, 2009;Proefke and Rinehart, 1992) .…”