In geologic time, the Cenozoic Era, the third era in the Phanerozoic Eon, follows the Mesozoic Era and spans the time between roughly 65 million years ago (mya) and present day. On the geologic time scale, Earth is currently in the Cenozoic Era of the Phanerozoic Eon.

The Cenozoic Era contains two geologic time periods, including the Tertiary Period (65 mya to approximately 1.8 mya) and the current Quaternary Period (1.8 mya to present day). The Tertiary Period is also sometimes referred to in terms of a Paleogene Period and a Neogene Period. When referred to in terms of a Paleogene Period and a Neogene Period, the Paleogene Period extends from approximately 65 mya to 23 mya and the Neogene Period from 23 mya to 2.6 mya. The Quaternary Period is also termed the Anthropogene Period. These periods are further subdivided into six different major epochs, including the Paleocene Epoch, Oligocene Epoch, Miocene Epoch...