The Cenozic Era By BritBratz Jan 2, 1811 The Cenozoic Era Started about 65 mya Jan 1, 1812 The Holocene is a geological epoch which began at the end of the Pletiscene Jan 8, 2012 The Paleogene Eon began 65.5mya +0.3 May 9, 2012 The Neogene started 23.03 and 0.05 MYA