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Extinction-level event

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Definition

noun

An event in geologic time where one of more species became extinct over a relatively short period of time, largely due to a catastrophic global event, a natural disaster, or an abrupt change in the environment, and based on studies of fossil records and macroscopic evidence.


Supplement

Examples of extinction-level event are Permian extinction of marine species, and Cretaceous extinction of various species, including dinosaurs.


Synonym(s):