A stone or rock formation composed of living organisms or their skeletal remains; essentially the same as a biolite.
From bio- 'life' and Greek lithos 'stone.' This term is often used interchangeably with biolite, particularly in paleontology and geology when describing fossil-rich rock formations.
The Great Barrier Reef will eventually become a biolith—in 10 million years, if it survives, it'll be fossilized rock, a monument to all the organisms that lived in it.
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