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Bedrock geology of the northern Columbia Plateau and adjacent areasThe Columbia Plateau is surrounded by a complex assemblage of highly deformed Precambrian to lower Tertiary continental and oceanic rocks that reflects numerous episodes of continental accretion. The plateau itself is comprised of the Columbia River basalt group formed between about 16.5 x 1 million years B.P. and 6 x 1 million years B.P. Eruptions were infrequent between about 14 and 6 x 1 million years B.P., allowing time for erosion and deformation between successive outpourings. The present-day courses of much of the Snake River, and parts of the Columbia River, across the plateau date from this time. Basalt produced during this waning activity is more heterogeneous chemically and isotopically than older flows, reflecting its prolonged period of volcanism.
Document ID
Document Type
Conference Paper
Swanson, D. A.
(Geological Survey Menlo Park, CA, United States)
Wright, T. L.
(Geol. Surv. Reston, Va., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Publication Information
Publication: Texas Univ. at Austin The Channeled Scabland
Subject Category
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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