There have been five major extinction events on Earth in the past 542 million years. This time frame or Eon is named the Phanerozoic Eon.
Zoic = of or relating to animal life.
The Phanerozoic Eon is divided into 3 Eras which are further divided into 12 Periods called the
The current Quaternary period is divided into 2 Epochs and 7 Ages.
The Neogene period is broken into 2 Epochs and 8 Ages.