Pliocene

[Sarah]

Of, pertaining to, or characterizing, the most recent divisionof the Tertiary age.

[Agnes]

from or referring to the period of time between around 5.3 million and 1.8 million years ago, in which many modern mammals and the first modern humans appeared:

[Britney]

Relating to or denoting the last epoch of the Tertiary period, between the Miocene and Pleistocene epochs.