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Figure F146. Structures related to the cooling of lava. A. Y-shaped (or “triple junction”) fracture (interval 309-1256D-84R-2, 1–14 cm). B. Y-shaped fracture (interval 309-1256D-98R-1, 9–20 cm). C. Curved fractures intersected at high angles by thinner veins (interval 309-1256D-112R-1, 14–35 cm).

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