bulb of percussion การใช้

• Other conchoidal features include small fissures emanating from the bulb of percussion.
• The bulb of percussion is the primary feature that identifies the ventral surface of a flake or blade artifact.
• A swelling appears at the point of impact called the "'bulb of percussion " '.
• Flakes removed in this manner lack a bulb of percussion, and are distinguished instead by the presence of a small lip where the flake's striking platform has separated from the objective piece.
• When explained visually, the bulb of percussion is visible on the ventral face as opposed to the dorsal face ( where it is smoother ) and considered to be on the " inside " of the parent core.
• It is named after 400, 000-year-old finds made by Hazzledine Warren in a palaeochannel at Clacton-on-Sea in the Retouch is uncommon and the prominent bulb of percussion on the flakes indicates use of a hammerstone.