Figure F11. Images of silt and sand components common in lithologic Subunit IA, dominated by extrabasinal grains of sedimentary and metamorphic derivation with a minor admixture of pelagic biogenic debris and generally clear volcanic glass. A. Biosiliceous grains (diatoms, silicoflagellates, and assorted spicules) (Sample 338-C0022B-1H-1, 11 cm; plane-polarized light [PPL]). B. Sand-size fragments of foraminifers (Sample 338-C0022B-21X-10, 35 cm; cross-polarized light [XPL]). C. Chert grain (Sample 338-C0022B-3H-4, 121 cm; XPL). D. Polycrystalline quartz grain (Sample 338-C0022B-10T-4, 105 cm; XPL). (Continued on next page.)
Previous | Close | Next | Top of page