| Answer | Crossword Clue |
|---|---|
| miocene | denoting the fourth epoch of the Tertiary period |
| 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 |
| eocene | of rock formed in the second epoch of the Tertiary geological period |
| eocene | noting or pertaining to an epoch of the Tertiary Period, occurring from 55 to 40 million years ago and characterized by the advent of the modern mammalian orders |
| pliocene | noting or pertaining to an epoch of the Tertiary Period, occurring from 10 to 2 million years ago, and characterized by increased size and numbers of mammals, by the growth of mountains, and by global climatic cooling |
