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eocene

/ˈiː.ə.siːn/

翻译: 始新世,地质年代中古近纪的一个世,约距今5600万年至3400万年前,以现代哺乳动物的出现和繁荣为特征。

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noun

/ˈiː.ə.siːn/C2formalscientific
  • zh始新世,地质年代中古近纪的一个世,约距今5600万年至3400万年前,以现代哺乳动物的出现和繁荣为特征。

A proper noun referring to a geological epoch that spanned from approximately 58 to 40 million years ago, characterized by the presence of modern mammals.

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  1. C1formalscientific

    A geological epoch that lasted from about 56 to 33.9 million years ago, characterized by the appearance of many modern mammal groups and a warm global climate.

    zh始新世

    • The Eocene epoch saw the first appearance of many modern mammal families.
    • Fossils from the Eocene are found in the Green River Formation in Wyoming.
    • During the Eocene, the Earth was much warmer than it is today.
词形
  • eocenes plural form
  • eocenes' possessive plural form
  • eocene's possessive singular form