pyroclastic surge deposit
- GLOSSARY OF VOLCANIC TERMS
Pyroclastic deposits that are left by pyroclastic surges. These deposits mantle topographic features but also generally thicken within topographic depressions. These deposits are generally well-sorted, and are enriched in crystals and lithic fragments relatively to pyroclastic flow deposits. Surge deposits commonly exhibit unidirectional sedimentary bedforms, including low angle cross-bedding, dune forms, climbing dune forms, pinch and swell structures, and chute and pool structures (Cas and Wright, 1987, p. 98).
Glossary of volcanic terms. - University of Wisconsin Oshkosh. G. J. Hudak. 2001.
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