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Figure F9. Photomicrographs of grains with higher exponential-R values and lower power-R values. A, B. Sample 311-U1326D-5X-6, 55–65 cm; (A) plain-polarized light; (B) cross-polarized light. C, D. Sample 311-U1329C-17H-2, 135–145 cm; (C) plain-polarized light; (D) cross-polarized light. E, F. Sample 311-U1328C-16X-3, 125–150 cm; (E) plain-polarized light; (F) cross-polarized light. G, H. Sample 311-U1325C-11X-1, 32–42 cm; (G) plain-polarized light; (H) cross-polarized light.

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