A Plano tradition complex of the Paleoindian period from c. 11,200 to 8000 bc (the complex dates to c. 10,000–9500 bp) and centered on a well-preserved, deeply stratified site in eastern Wyoming. Hell Gap is also the name of a projectile point type of the Plano tradition, which is bifacially worked with a broad pointed top set on a straight-sided trapezoidal body. The base is narrow and straight. Experiments show that these points were probably spearheads and fully capable of penetrating the hide and ribcage of large beasts such as bison.
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