Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52789#.VKNkU8nQrzE Author(s) Michael L. Cummings * , Jonathan M. Weatherford , Leslie A. Mowbray Affiliation(s) Department of Geology, Portland State University, Portland, USA . ABSTRACT Subaerial fallout from the Holocene eruption of Mount Mazama in the Oregon Cascade Range was deposited upon relatively low permeability volcanic and volcaniclastic bedrock and regolith. In the Walker Rim study area, erosion by ephemeral streams shortly after the eruption disrupted the lateral continuity of the 270 to 300 cm-thick pumice deposit. Co-evolution of the surface- and ground-water systems in a low-relief, low-slope la...
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