Figure F34.
Vesicular, hydrothermally altered, aphyric basalt close to the contact with the
sedimentary sequence overlaying the basement. The piece is crosscut by several
large veins of sedimentary material, carbonate, and green angular fragments of
glassy basalt (hyaloclastite). The veins are accompanied by large halos showing
different colors. Thin veins of reddish iron oxyhydroxide are also visible
(interval 195-1201D-46R-1, 24-66 cm).