Relating to, composed of, or resembling coral; of or belonging to the Corallian geological period.
From 'coral' + Latin '-ianus' (relating to). In geology, it specifically refers to a Jurassic rock formation famous for its coral and oyster fossils.
The Corallian period froze an ancient tropical ocean in stone—when geologists dig into Corallian rocks, they're literally uncovering an underwater museum from 160 million years ago!
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