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Feb 01 2019 Outcrops of THC are 30 km west of the second largest fluvial system in North America the Mackenzie River of Canadas Northwest Territories Subarctic huntergatherers quarried THC from approximately 10000 years before present to European contact Andrews et al 2012 Hanks and Pokotylo 2000Specifically THC has been reported in association with a Late Pleistocene fluted

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