Figure F14. Photomicrograph of potential biogenic alteration features within a hyaloclastite breccia, Site U1365. Altered basaltic glass with tubelike micro-scale weathering features (Sample 329-U1365E-8R-4, 3–6 cm; hyaloclastite breccia). Fe-ox = iron oxyhydroxide. Plane-polarized light; 700× magnification.
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