- 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.
Look at other dictionaries:
Pyroclastic flow — Pyroclastic flows sweep down the flanks of Mayon Volcano, Philippines, in 1984 … Wikipedia
Pyroclastic rock — Pyroclastic rocks or pyroclastics (derived from the Greek πῦρ , meaning fire, and κλαστός , meaning broken) are clastic rocks composed solely or primarily of volcanic materials. Where the volcanic material has been transported and reworked… … Wikipedia
Pyroclastic fall — A pyroclastic fall is a uniform deposit of material which has been ejected from an eruption or plume such as an ash fall or tuff. Pyroclastic flows occur relatively spontaneously in the geological time scale and are great indicators of time.… … Wikipedia
Pyroklastische Fließablagerung — Ein pyroklastischer Strom fließt beim Ausbruch 1984 die Flanken des Vulkans Mayon auf den Philippinen hinab Der Begriff Pyroklastische Fließablagerungen bezeichnet in der Vulkanologie bzw. der Geologie pyroklastische Ablagerungen, die sich durch… … Deutsch Wikipedia
Mount Vesuvius — This article is about the mountain/volcano in Italy. For other uses, see Vesuvius (disambiguation). Mount Vesuvius Monte Vesuvio … Wikipedia
1980 eruption of Mount St. Helens — Photograph of the eruption column, May 18, 1980 Volcano Mount St. Helens … Wikipedia
Breccia — (pronEng|ˈbrɛtʃiə, ˈbrɛʃiə, it. breach) is a rock composed of angular fragments of several minerals or rocks in a matrix, that is a cementing material, that may be similar or different in composition to the fragments. A breccia may have a variety … Wikipedia
volcano — /vol kay noh/, n., pl. volcanoes, volcanos. 1. a vent in the earth s crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals. 2. a mountain or hill, usually having a cuplike crater at the summit,… … Universalium
sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
Debris flow — Scars formed by debris flow in great Los Angeles during the winter of 1968 1969. The photograph was taken within several months of the debris flows occurring. A debris flow is a fast moving, liquefied landslide of unconsolidated, saturated debris … Wikipedia