noun
biolith
Technical term in mineralogy for a rock formed by organic processes or composed of organic remains.
生物岩は、生物の遺骸や活動によって形成される岩石の総称です。
Biolith is a general term for rocks formed by the remains or activity of organisms.
Compound of 生物 (seibutsu, 'organism') and 岩 (gan, 'rock'). The exact historical derivation is uncertain; the term is a modern scientific coinage.