Figure F5. Digital photomicrograph (crossed nicols) of a subangular fragment of plutonic rock with intergrown quartz, feldspar, and biotite suggestive of a granitic source rock. Surrounding grains are subrounded to rounded grains of glassy basalt, quartz, and feldspar. There is a micritic matrix (interval 180-1116A-1R-1, 58-60 cm).