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.