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Figure F20. Close-up photographs of vesicles in hand specimens. Core surfaces were photographed dry. Arrows point toward top of core. A. Vesicles in aphyric to highly olivine-phyric basalt (interval 330-U1377A-4R-1, 50–60 cm). Vesicles are mainly filled with carbonates (calcite and siderite) and minor pyrite. B. Close-up photograph of the same rock, showing vesicle filled with pyrite along the margins and subsequently with carbonates (interval 330-U1377A-4R-1, 55–57 cm).

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