Figure F51. Common sand grain types. A. Biosiliceous debris (Sample 338-C0002K-1H-4, 90 cm; PPL). B. Vacuolized untwinned feldspar (pc) and chert (ch) (Sample 338-C0002L-10X-8, 80 cm; XPL). C. Quartz-chlorite metamorphic lithic fragment with foliation (chlorite schist) (Sample 338-C0002L-11X-7, 77 cm; PPL). D. Quartz-muscovite metamorphic lithic fragment with foliation (muscovite schist) (Sample 338-C0002L-1H-4, 90 cm; XPL).
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