Geological time line in one calendar year By GooGee11 Jan 1, 2013 Earth is formed Feb 25, 2013 First cell Mar 4, 2013 Oldest dated rock Mar 20, 2013 Fossil of Stomanites Jun 17, 2013 First cell with nuclei Nov 18, 2013 Palezoic begins Dec 1, 2013 First insect Dec 2, 2013 First Ampibians Dec 5, 2013 First reptials Dec 12, 2013 The Mesozoic Begins Dec 13, 2013 First Dinosaurs Dec 22, 2013 First Flowering Plants Dec 26, 2013 The Censozoic Begins Dec 26, 2013 First Ancestors of Dogs and Cats Dec 27, 2013 Widespread Grasses Dec 27, 2013 First Ancestors of Pigs and Deer Dec 31, 2013 Oldest Human-like Ancestors Dec 31, 2013 Oldest Direct Human Ancestor Dec 31, 2013 First Modern Man