Abstract
Pyroclastic deposits form directly from the fragmentation of magma and rock by explosive volcanic activity. They can be grouped into three genetic types according to their mode of transport and deposition: falls flows surges In this introductory chapter on pyroclastic rocks we set out the differences between these three basic types of deposit. We also describe the eruption style and the deposits of different kinds of pyroclastic falls, flows and surges, based on studies of Quaternary volcanoes. Recent work on pyroclastic deposits from modern volcanic successions has largely concentrated on their genesis, and here we relate the deposits to the physical processes controlling their formation, transportation and deposition. Accretionary lapilli receive special mention, since these can be important indicators of certain types of eruption and process, and for distinguishing pyroclastic deposits from other volcaniclastic sediments.
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