volcaniclastic

[ vol-kan-i-klas-tik ]

adjective

, Geology.

1. pyroclastic.

Word History and Origins

Origin of volcaniclastic¹

1960–65; blend of volcanic and clastic

Example Sentences

Volcaniclastic bedrock, in fact. Its conglomerates, sandstones and shales inform us that it's a submarine fan complex. 

From Scientific American