Figure F8. Type IV: clay minerals. Type IV includes smectites (Sm; continuous series of lines in the 5°–9°2θ range), kaolinite, and glauconite. Samples 340-U1395A-18X-1, 39–40 cm (black); 22X-1, 39–40 cm (red); and 18X-3, 58–60 cm (blue).
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