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Mafic eruptions have been the dominant form of volcanic activity in central Oregon throughout the Holocene. These eruptions have produced cinder cones, extensive lava flows, and tephra blankets. In most cases,...
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8 pp. Adopted 2010-10-28. Department of Land Conservation and Development Notice of Adopted Amendment
18 pp. Adopted 2011-12-16. Department of Land Conservation and Development Notice of Adopted Amendment