Figure F19. Digital photomicrograph (crossed nicols) of a coarse-grained sandstone containing subrounded to rounded porphyritic basalt, andesite, acidic volcanics, and subangular detrital grains of plagioclase, hornblende, clinopyroxene, and rare quartz in a sparry calcite cement (interval 180-1115C-30R-CC, 16-19 cm).