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Geomorphology of Steens Mountain
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acidic lava adjacent Aeroplane view altered Alvord Creek Beds Alvord Desert Analysts W. H. andesite andesitic flow aphanitic appears approximately augite basaltic flows basaltic series base Basin biotite-dacite breccias C. I. P. W. symbol capping cirque correlation Cottonwood Creek dacite dikes Dioxide eastern scarp erosion exposed exposures extrusion fault block feet in thickness feldspar flow breccias flowage formed Geology glassy Harney Basin Hart Mountain Herdsman High Steens horizontal inclined intrusion irregular jointing labradorite laccolith Little Alvord Creek locally lower Magnetite margin miles north of Alvord Northern Steens northward olivine Orthoclase outcrops overlain overlying perlite phenocrysts Pike Creek plagioclase platy rhyolite Pueblo Mountain quartz region rhyolite rock roughly sediments shows slope southern end southward spherulites Steens Mountain step faults stratified tuffs stratigraphic structure surface thin section Toughey Creek tuffaceous tuffs upper flow vent vertical vesicular volcanic series W. H. and F Warner Basalt Warner Valley zone