Figure F17. Core images and photomicrographs of concentric chilled margins within a pillow center exhibiting alteration, grain size variation, and vesicles and stages of lava cooling (interval 329-U1368F-10R-2, 1–17 cm). Fe-ox = iron oxyhydroxide. Core images are under plane-polarized light and photomicrographs are under cross-polarized light at 5× magnification. The large format whole section photo is in plane polarized light at 1× magnification.
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