Figure F34. Examples of petrographic features. A. Largely undisaggregated silty claystone fragments (Sample 338-C0002H-1R-1, 129 cm; PPL). B. Nannofossil-bearing silty claystone (Sample 338-C0002H-1R-1, 45 cm; XPL). Red arrows = coccoliths. C. Red-brown organic matter (kerogen) of terrestrial origin (Sample 338-C0002H-2R-3, 70 cm; PPL). Red arrows = pyrite framboids. D. Possible microdolomite crystals (red arrows) in a calcareous silty claystone (Sample 338-C0002H-1R-1, 102 cm; XPL).
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