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Origin: A Genetic History of the Americas

by Jennifer Raff

by Jennifer Raff

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Mesa complex projectile point from <strong>the</strong> Mesa site. Redrawn from a 2008<br />

Journal <strong>of</strong> Field Archaeology article by Michael Bever.<br />

Between about 13,500 and 12,800 years ago, at numerous sites in<br />

interior Alaska (6), archaeologists found quite different artifacts: no<br />

microblades, but stone tools that had been flaked on both sides (bifacially<br />

flaked), including small teardrop-shaped spearheads called Chindadn<br />

points. They designated this group <strong>of</strong> artifacts <strong>the</strong> Nenana complex.<br />

Numerous sites dated to a bit later in <strong>the</strong> Tanana and Nenana river

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