eocene epoch
English Thesaurus
1. from 58 million to 40 million years ago; presence of modern mammals (noun.time)
instance hypernym | : | epoch, |
definition | : | a unit of geological time that is a subdivision of a period and is itself divided into ages (noun.time) |
part meronym | : | tertiary, tertiary period, |
definition | : | from 63 million to 2 million years ago (noun.time) |
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