tertiary period
English Thesaurus
1. from 63 million to 2 million years ago (noun.time)
| instance hypernym | : | geological period, period, |
| definition | : | a unit of geological time during which a system of rocks formed (noun.time) |
| part holonym | : | pliocene, pliocene epoch, |
| definition | : | from 13 million to 2 million years ago; growth of mountains; cooling of climate; more and larger mammals (noun.time) |
| part holonym | : | miocene, miocene epoch, |
| definition | : | from 25 million to 13 million years ago; appearance of grazing mammals (noun.time) |
| part holonym | : | oligocene, oligocene epoch, |
| definition | : | from 40 million to 25 million years ago; appearance of sabertoothed cats (noun.time) |
| part holonym | : | eocene, eocene epoch, |
| definition | : | from 58 million to 40 million years ago; presence of modern mammals (noun.time) |
| part holonym | : | paleocene, paleocene epoch, |
| definition | : | from 63 million to 58 million years ago; appearance of birds and earliest mammals (noun.time) |
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