Figure F17. Digital photomicrograph (crossed nicols) of a medium-grained sandstone with a sparry calcite cement containing subrounded to rounded fragments of plagioclase phyric basalt, subangular detrital grains of plagioclase, hornblende, clinopyroxene, biotite, and rare quartz (interval 180-1115C-29R-1, 72-73 cm).