The engraved flint flake from Kiik-Koba, layer IV. Ana Majkić Francesco d’Errico Vadim Stepanchuk 10.1371/journal.pone.0195049.g005 https://plos.figshare.com/articles/figure/The_engraved_flint_flake_from_Kiik-Koba_layer_IV_/6211967 <p>Photo (top) and tracing (bottom). Engraved lines are indicated by dark-grey areas outlined in black, surface damage by light gray areas, flake scars by gray lines.</p> 2018-05-02 17:34:07 3 D reconstruction interpretation incised 37 cal kyr BP Mousterian site Kiik-Koba engraving cortexe Neanderthal child burial flint flake Middle Paleolithic sites evidence incisions object IV Crimea framework analysis cortex