Table 1. Stone artifact inventory from the Lower and Upper units at YFT1
Upper unit Lower unit
Raw materials
    Silcrete 410 458
    Other 1438 139
Artifact types
    Denticulates 25 5
    Other retouched pieces 13 4
    Pigment lumps 23 6
    Other 1787 582
  • Raw materials besides silcrete include calcrete, quartz, diorite, shale, quartzite, sandstone, and quartz porphyry. Artifact types besides denticulates, other retouched pieces, and pigment lumps include unretouched flakes and flake fragments, chips (mostly tiny flakes), cores, angular chunks, and manuports (unmodified, humanly introduced stones).