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In 1963, the Glenbow Foundation excavated a bison bone bed exposed at a water hole in southern Alberta near the Montana border. Age estimates grounded in geology place the bone bed between 7,000 and 11,000 years ago. Projectile points at the Fletcher site include the Alberta and Scottsbluff types. Other artifacts suggest that the site was not only a kill but also a butchering station. The heavy emphasis on bison here, as well as at nearly all related sites in the northern Great Plains, makes it clear that Fletcher properly belongs to the Paleo-Indian big-game hunting continuum rather than to the Archaic stage.
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Richard G. Forbis (1968) studied this question.
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