| Answer | Crossword Clue |
|---|---|
| holocene | relating to the second and most recent epoch of the Quaternary period |
| quaternary | Of, relating to, or denoting the most recent period in the Cenozoic era, following the Tertiary period and comprising the Pleistocene and Holocene epochs (and thus including the present) |
| oligocene | Of, relating to, or denoting the third epoch of the Tertiary period, between the Eocene and Miocene epochs |
| paleocene | Of, relating to, or denoting the earliest epoch of the Tertiary period, between the Cretaceous period and the Eocene epoch |
