Bulletin of the United States Geological SurveyThe Survey, 1959 - Geology |
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abundant Adak Aleutian Islands alinements altitudes Amatignak Island Amchitka Pass ancient Mount Kanaton andesite andesite dikes Andreanof Islands apparently augite basaltic beds boulders breccia caldera Cape Chlanak central Delarof Islands clinopyroxene coarse coarse-grained coast of Kanaga Coats composition cones contours crystals Cushman Delarof and westernmost Delarof Islands dike swarm dikes east fault feet Foraminifera fossils fragment granodiorite Ilak inclusions intrusion Kanaga and Tanaga Kanaga Bay Kanaga Island Kanaga Volcano Kanaton Ridge Kavalga labradorite late Tertiary lava flows layers marine miles Miocene northeast northern Kanaga northwest Ogliuga older olivine opaque oxides Pecten Pelecy Pelecypoda phenocrysts pigeonite pillow lavas plagioclase planation Pleistocene Pliocene pluton porphyritic probably rhyodacite Rittmann rocks of Amatignak rocks of Ulak scarps sequence shallow shield volcanoes sills slope southern specimen steep structures subaerial submarine Tanaga Pass topography trend tuff tuffaceous Ulak Island Unalga wave-cut westernmost Andreanof Islands zone