Figure F6. Photomicrographs of clast types in gravel. A, B. Porphyritic intermediate volcanic rock fragment (Sample 316-C0007D-12R-CC, 51–55 cm). C, D. Porphyritic intermediate volcanic rock fragment with plagioclase and orthopyroxene phenocrysts (Sample 316-C0007D-12R-2, 40–44 cm). E, F. Plutonic rock fragment with plagioclase, orthoclase, and quartz (Sample 316-C0007D-12R-4, 21–26 cm). G, H. Plutonic rock fragment with plagioclase, orthoclase, and quartz (Sample 316-C0007D-12R-4, 55–59 cm). A, C, E, and G are under plane-polarized light and B, D, F, and H are under cross-polarized light.