Period 5, Marin, History of Earth Timeline By 2013marincly Jan 1, 2011 5000 Billion years ago, Birth of the solar system More than 100 billion years sice the universe explode into existence from nothing the solar system interstellar gas and dust. Jan 26, 2011 4.6 BYA Earth began to form. Mar 21, 2011 3.8 BYA Bacteria diversify. Apr 5, 2011 3.7 BYA Photosynthesizing bacteria Apr 20, 2011 3.5 BYA Oldest fossils, Jul 24, 2011 2.2 BYA Oxygen appears in the enviroment, causing damage to living tissues. Aug 22, 2011 1.8 BYA Oldest eukaryote fossils, Nov 3, 2011 800 mya Major glaciation period begins. Nov 5, 2011 600 mya Protective ozone layer in place. Nov 14, 2011 480 mya Land plants. Nov 20, 2011 400 mya Oxygen nears present day levels. Nov 23, 2011 350 mya Reptiles Dec 1, 2011 250 mya 90 percent of all species go extinct. Dec 3, 2011 220 mya Mmmals Dec 4, 2011 200 mya Pangaea starts to break apart Dec 26, 2011 65 mya 60-80 percent of all species go extinct. Dec 27, 2011 60 mya Primates Dec 31, 2011 5.2 mya Hominids Dec 31, 2011 100,00 years Modern Humans Dec 31, 2011 100.00 years All mammals and birds over 45 pound go extinct.
