The term Cenozoic means

relating to or denoting the most recent era, following the Mesozoic era and comprising the Tertiary and Quaternary periods.

the Cenozoic era, or the system of rocks deposited during it.

singula

TheCenozoic Era meaning "new life", is the current and most recent of the three Phanerozoic geological eras, following the Mesozoic Era and extending from 66 million years ago to the present day.

Or

The name is derived from the Greek phrase meaning "recent life." TheCenozoic Era is divided into three periods: ... Neogene Period (23-2.6 million years ago), which includes the Miocene and Pliocene epochs); Quaternary Period (2.6 million years ago to the present), consisting the Pleistocene and Holocene epochs).