noun
clastic rock
Technical term in geology referring to rocks composed of fragments of pre-existing rocks.
砂岩や泥岩は砕屑岩の一種です。
Sandstone and mudstone are types of clastic rock.
Compound of 砕屑 (saisetsu, 'clastic') + 岩 (gan, 'rock'). The exact derivation of 砕屑 is uncertain, but it is a Sino-Japanese term used in geology.