morphometrically

These experiments revealed that a number of combinations of the above techniques and tool types are rather ineffective (pincer claw or bone tool from the outside break the tool, stone tool through the aperture breaks the shell lip) and that the holes we produced by piercing the shells through the aperture with a bone tool were morphologically, morphometrically, and microscopically (microchipping of the outer shell layer around the perforation) compatible with those observed on the Nassarius from Blombos Cave, while those from Skhul and Oued Djebbana closely resemble the ones we produced by punching the outside of the body whorl with a stone tool.

More than Ornament 2006