Konrad Merk, Excavations at the Kesslerloch… (1876)
“ The under side of these flint knives is always smooth, and a trifle arched or curved; evidently arising from the conchoidal fracture of the flint. Flints of this form have very probably been used as arrow- or lance-heads. The second general form of flints have doubtless been used as boring tools: they are distinguished from those last mentioned by having one end decidedly blunt, instead of being chisel-shaped and sharp (Plate I. fig. 4) . At all events, I have been able with the greatest ease to bore nearly circular holes in stag's-horn with similar pointed flints. ”
