Figure F14. Images of variation of clay clasts in the gravel interval near the upper boundary of lithologic Subunit IB. Note the rounded shapes and variable color and silty/clay ratios displayed by different clasts (Sample 338-C0022B-38X-2, 72 cm). A, B. Red-brown clay-rich clast in (A) plane-polarized light (PPL) and (B) cross-polarized light (XPL). C, D. Gray-brown clast with disseminated microcrystalline pyrite in (C) PPL and (D) XPL. E, F. Silt-bearing clasts in (E) PPL and (F) XPL.
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