MAMMOTH BONE FLAKE
WITH BULB OF PERCUSSION
FLAKE NO. 81-303
LANGE FERGUSON SITE
SOUTH DAKOTA
COPYRIGHT OCTOBER 31, 2012 PETER A. BOSTROM
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COLLECTION OF ARCHAEOLOGICAL LABORATORY, CENTER FOR WESTERN STUDIES
AUGUSTANA COLLEGE

     This bone flake has one of the best examples of a bulb of percussion. It was detached from a diaphyseal (midsection) segment of the mammoth's tibia. It appears that it was hit or struck fairly hard. It's described as having hackle marks or lines of force that radiate away from the bulb of percussion.

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