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The Acasta Lake site is situated at the edge of the Barren Lands on the east end of an esker ridge that runs through Acasta Lake. There is evidence of prehistoric occupation in caribou trails and blowouts. Two pits were excavated by Forbis, covering a total of 140.21m (460 feet). The pits centered around a large quartzited boulder named Supply Rock, which is the source of most of the lithic tools recovered here. Archaeological remains include microliths, hearths, projectile points and a bifacial knife. This is the type site for the Acasta Lake type complex.