Flaking applied to a broken or dulled tool so as to reclaim it for additional use. Sometimes called Lateral Rejuvenation, reworking was the characteristic means by which an implement was resharpened. Alternate and bifacial beveling, serration, and other diagnostic features of blade renewal are very important to age determination as well as for the purpose of assembling attribute clusters for typological analysis. Typically reworked blades or points have a different outline than their former pristine outline. Reworking of lithic objects was employed by early man due to the general lack of high quality lithic materials.
Source: LITHICS-Net, Glossary of Lithics Terminology
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