pyroclastics  search
BTigneous rocks
 .volcanic rocks
 ..pyroclastics
NTandesite tuff
 ash-flow tuff
 green tuff
 hyaloclastite
 ignimbrite
 pumice
 rhyolite tuff
 scoria
 tuff
 tuffite
 welded tuff
UFtephra
RTagglomerate
 sedimentary rocks
 clastic sediments
 glasses
 shirasu
 volcanic ash
 sediments
 clastic rocks
 ash falls
 volcaniclastics
 ash flows
 pyroclastic flows
 eruptions
 pyroclastic surges
 bentonite
 volcanic breccia
 ejecta
 lapilli
SNAs of 1984, not to be used as sediments or sedimentary rocks. Use volcaniclastics when sediments or sedimentary rocks are made up partially of material originating from a volcano. Before 1981, also search pyroclastics and glasses.
pyroclastics and glasses  search
SNAs of 1981, no longer a valid term for GeoRef. Use pyroclastics or glasses as applicable. See also volcaniclastics.