eocene
始新世
解説 Definition
地質学的な時代
The Eocene is a geological epoch that lasted from about 56 to 34 million years ago, when many early forms of modern mammals appeared and Earth generally had a warmer climate than it does today.
覚え方のコツ Memory Tip
Eocene は eos「夜明け」と、生代区分名を作る -cene「新しい」に結び付く語で、「現代型生物の夜明け」と捉える。地質時代名なので通常は Eocene と大文字で始め、Eocene epoch、Eocene fossils、during the Eocene の形で覚えると使いやすい。
Connect Eocene with dawn: its first element comes from Greek eos, meaning “dawn,” while -cene appears in the names of several geological epochs. Think of the Eocene as a dawn for many forms of modern mammal life. Because it is the formal name of a geological interval, it is normally capitalized. Learn it through common combinations such as the Eocene epoch, Eocene fossils, Eocene climate, and during the Eocene.
例文
The Eocene epoch saw the emergence of many modern mammals.
始新世は多くの現代の哺乳類の出現を見ました。
Fossils from the Eocene period reveal ancient ecosystems.
始新世の時期からの化石は古い生態系を明かします。
Climate change during the Eocene affected global biodiversity.
始新世中の気候変動は世界的な生物多様性に影響を与えました。
eocene の類義語・関連語
紛らわしい語
eocene の語源・成り立ち Etymology
語源はギリシャ語で「夜明け」を意味する「eos」と、「新しい」を表す「kainos」を縮めた接尾辞「-cene」の合成語です。現代型の哺乳類が現れ「生物進化の夜明け」を迎えた時代であるため、この名前が付けられました。同じ接尾辞は中新世（Miocene）などの名称にも使われています。
Eocene was coined in the nineteenth century from Greek ēōs, meaning “dawn,” and kainos, meaning “new” or “recent.” The second element appears in the English geological suffix -cene, also found in Miocene and Pliocene. The name referred to the dawn of what geologists then recognized as recent forms of animal life, especially the growing presence of mammalian groups related to modern ones.
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