Tuffaceous extrusive rocks preserved in a channel. The channel most probably formed by the erosive action of tuffs at the time of eruption, although they could also infill a dry river valley.
« Back to Glossary IndexTuffaceous extrusive rocks preserved in a channel. The channel most probably formed by the erosive action of tuffs at the time of eruption, although they could also infill a dry river valley.
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