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Figure F6. Photomicrographs of three portions of Thin Section 47 (Sample 324(198)-1213B-31R-1, 2–7 cm) at an extrusive-unit margin. Note the increasing crystallinity of coalesced spherulites and increasing grain size of small titanomagnetite with distances from the nearly quenched edge of the thin section of (A) ~1 mm, (B) ~3 mm, and (C) ~20 mm. Plane-polarized light.

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