Figure F36. "Mixed" alteration halos. A. 10 mm wide black halo with sparse iron oxyhydroxide filled vesicles (interval 301-U1301B-21R-3 [Piece 7, 51–60 cm]). B. Moderately vesicular interval containing a 20 mm wide black halo in which vesicles are filled with iron oxyhydroxide (interval 301-U1301B-14R-1 [Piece 7, 42–49 cm]). (Photographs are of wet surfaces.)
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