Recent excavations in the Gulf of Georgia region have added microblades and microcores to assemblages of the Locarno Beach and Marpole culture types. The production of microblades is now seen as a regional tradition lasting from at least 1200 B.C. until around A.D. 400. Persistence of this technology may indicate more continuity of culture growth than has until now been ascribed to the Gulf of Georgia sequence.
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Donald H. Mitchell (1968) studied this question.
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