Figure F13. Photomicrographs of thin sections. A. Highly plagioclase–pyroxene phyric basalt with traces of iddingsite and celadonite-filled vesicles. B. Highly plagioclase–pyroxene phyric basalt including aggregates of pyrite. C. Diffuse limit between a highly phyric–sparsly vesicular basalt and a moderately phyric–highly vesicular basalt. D. Close-up photograph of heterogeneous basalt (interval 322-C0012A-55R-CC, 27–32 cm).
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