ディープタイム（地質学的時間）
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<timefyi-glossary slug="deep-time"></timefyi-glossary>定義
数百万年から数十億年に及ぶ地質学的時間の概念で、人間の直感的な感覚をはるかに超える。ジョン・マクフィーによって提唱され、地球の歴史、進化、宇宙論の理解に不可欠。