pumice fall

pumice fall

[′pəm·əs ‚fȯl]
(geology)
Pumice falling from a volcano eruption cloud.
References in periodicals archive ?
American geologist Jon Major and his team observed that 'pyroclastic flows, ash-cloud surges, and pumice fall deposited during the climactic eruptive activity completely destroyed vegetation and produced the most dramatic landscape disturbance in catchment headwaters.'
Hire charges in the land of smoke and ash have come down quicker than a ton of pumice fall out.
Out flow facies are represented by ignimbrites (units I.1 to I.4), accretional lapilli rich ash fall deposits (distal facies of units II.3 and II.5), ash and pumice fall deposits (Unit II.10), epiclastic torrential and fluvial sandstones and conglomerates.