Figure F157. Narrow cataclastic zones resembling veins cut through cryptocrystalline basalt. A. Interval 309-1256D-143R-1, 37–44 cm. B. Sand-sized quartz and feldspar grains within the cataclastic zone (Thin Section 123; Sample 309-1256D-143R-1, 33–38 cm) (field of view = 1.25 mm; cross-polarized light, blue filter).
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