Eocene
Chamber's Twientieth Century Dictionary · 1908 · p. 36
ē′ō-sēn, adj. ( geol. ) first in time of the three subdivisions of the Tertiary formation. [Gr. ēōs , daybreak, kainos , new.]
Bu kavram başka kaynaklarda da geçiyor
A Dictionary of Scientific Terms (1927)
The American Dictionary and Cyclopedia (1910)
Webster's Condensed Dictionary- A Condensed Dictionary of the English Language (1909)
Chandler's Encyclopedia (1898)
Zell's Condensed Dictionary (1879)
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