Lightly iron-stained, light-green-gray, porphyritic andesite containing phenocrysts of plagioclase and clinopyroxene in a groundmass of glass and fine-grained plagioclase. Plagioclase (An 55-60) phenocrysts are sieve textured and contain inclusions of glass. The groundmass shows poorly developed flow foliation around phenocrysts. Pilotaxitic texture.
Map and tables showing geochronology and whole-rock geochemistry of selected samples, Ugashik and part of Karluk quadrangles, Alaska