bulb of percussion

bulb of percussion

[¦bəlb əv pər′kə·shən]
(archeology)
A cone-shaped bulge on a fractured flint surface that was made by a blow striking at an angle.
References in periodicals archive ?
Percussion events--locations of percussion impact that induce helical fracture planes but exhibit a positive bulb of percussion and no percussion notch.
Flake scars--shallow concave surface features indicating the removal of a portion of the cortical thickness by percussion, producing a negative bulb of percussion on the core and exhibiting either a feathered or a hinged termination.
An impact event was identified that consists of a bulb of percussion on thick cortical limb bone.
The flake exhibits a platform, bulb of percussion, and hackle marks.
CMN 57092 (originally designated by members of the Northern Yukon Research Programme as 11 A/76 S25 E140 2882) is a flat cortical limb segment probably from a woolly mammoth that exhibits an impact notch (Table 1) with a bulb of percussion on the medullary face (Fig.
from a lance on the bulb of percussion (Faulkner 1974).