This online article, published on the mantleplumes.org website, reviews the geology and tectonics of the Oregon High Lava Plains, an enigmatic volcanic characterized by bimodal volcanism with a west-younging progression in ages of silicic volcanic rocks. The author reviews and critiques the arguments made by other workers that this westward younging direction (the opposite direction as silicic volcanics in the Snake River Plain and Yellowstone Plateau) contradicts the Yellowstone hotspot model. Several maps and an extensive bibliography are included on this page.
