pyroclastic flow deposit

GLOSSARY OF VOLCANIC TERMS
Pyroclastic (volcaniclastic) deposits that are left by pyroclastic flows (Cas and Wright, 1987, p. 96). The deposits are usually topographically controlled (infilling valleys and topographic depressions), massive, and poorly sorted. Depending upon their thickness and heat retention, pyroclastic flow deposits may coalesce into welded tuffs. Pumice-rich pyroclastic flow deposits are often called "ignimbrites".

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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