Last Updated
：2025/12/06
mass extinction event
Noun
Japanese Meaning
地質学や進化論において、地球上の生命の約75%が、300万年以内の地質学的期間にわたって急激に絶滅したとされる5つの大規模な絶滅事象の一つ。特に最後の事象は、約6600万年前の白亜紀‐古第三紀境界で起こったとされる。
（ plural ）
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(evolutionary theory, geology) One of five historical events in which the Earth experienced a loss of ∼75% of all species over a geological interval of less than 3 million years, the most recent being the Cretaceous–Paleogene extinction event 66 million years ago.
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mass extinction event
Geologists debate whether the rapid disappearance of diverse marine fossils in the layer signals a mass extinction event comparable to the end-Cretaceous die-off.
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Geologists debate whether the rapid disappearance of diverse marine fossils in the layer signals a mass extinction event comparable to the end-Cretaceous die-off.
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