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Hell Gap
CATEGORY: culture; site; artifact
DEFINITION: A Plano tradition complex of the Paleo-Indian period occupied from c 11,200-8000 BC (complex 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.
Hell Gap point
CATEGORY: artifact
DEFINITION: Bifacially worked chipped stone projectile points of the Plano Tradition with a broad pointed top set on a straight-sided trapezoidal body. The base is narrow and straight. Used by later Palaeo-Indian cultures of the North America Plains in the period around 7500 BC. Experiments show that these points were probably spearheads and fully capable of penetrating the hide and rib cage of large beasts such as bison.
CATEGORY: measure
DEFINITION: A source of bias in tree-ring dating representing the length of time between the formation of a dated ring and the date when the tree was cut. A gap and hiatus constitute a disjunction.
SYNONYMS OR RELATED TERMS: mound builder, incubator bird
DEFINITION: A member of a family of stocky, chickenlike birds (order Galliformes, family Megapodiidae) found in Australia and the islands of the southwestern Pacific that build huge mounds of decaying vegetable matter in which to incubate their eggs. Most of the 12 species rely on fermenting plant matter to produce heat for incubation, but some use solar heat and others the heat produced by volcanic action.

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