Definition of pyroclastic deposit
A deposit made up mainly of rock material that has been expelled aerially, normally explosively, from a volcanic vent, such as agglomerate, tuff, and ash. The fragments range in size from bombs and blocks to dust or ash. Such deposits are usually designated according to the lavas to which they correspond in composition.
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Locality Updated: Lucky Break claim, Dennison Peak, Tulare Co., California, USAFrom Chester S. Lemanski, Jr., 5th Dec 2013 16:27:34