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1200-1600 : Culture changes from the West
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During the long period from 1200-1600s, changes to the Plateau Culture seemed to
come from the West. The Plateau area was influenced by the highly specialized
Northwest Coast culture of the Indians living on the West Coast of
Washington and Oregon.
Some of these influences include mat and plank houses, wood carving and
bone carvings with pictures of animals on them. And certain burial customs using
cremation and also scaffold burial.
Part of this diffusion was possibly brought about by a Chinook group, the Wishram,
who migrated from the coast up the Columbia, and settled in the area near the Dalles.
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