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Eocene 音标拼音: ['iəs,in]
n. 始新世,第三纪下层
a. 始新世的,第三纪下层的 始新世,第三纪下层始新世的,第三纪下层的 Eocene n 1: from 58 million to 40 million years ago; presence of modern mammals [synonym: {Eocene}, {Eocene epoch}] Eocene \E"o*cene\, a. [Gr. 'hw`s daybreak, dawn ? new,
recent.] (Geol.) Pertaining to the first in time of the three subdivisions into which the Tertiary formation is divided by geologists, and alluding to the approximation in its life to that of the present era; as, Eocene deposits. -- n. The Eocene formation. --Lyell. [1913 Webster]
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