unifacial

Flaked in such a way as to produce a cutting edge that is sharp on one side only. Used of a stone tool.
◆ Unifacial tools are known as a unifaces and include early core tools such as choppers as well as later flake tools such as scrapers and adzes.
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"The trace fossil is associated with megafauna bones, plant material and unifacial lithic tools," the study's abstract adds.

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