This large flow-banded rhyolite biface is from Maine.  The artefact is heavily weathered but is from an undated context, so the precise age is unknown.  The flaking is consistent with Clovis-period technology, ca. 10,000-13,000 BP.

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This very large and heavily patinated rhyolite biface was thinned by invasive flaking.  Large, flat biface thinning scars are present on one face, extending two-thirds of the way across the biface.  One margin of the reverse side was similarly thinned, but these scars are intruded by shorter scars from the opposite edge.  The base of the biface was end-thinned by percussion flaking, which is a typical technique in Clovis technologies.  The surfaces have patinated to gray and the surfaces are devitrified.