Geologic By boltysuperdog Jan 1, 1900 Formation of the Earth Jan 1, 1901 Formation of the moon Jan 1, 1904 First crust forms Jan 1, 1906 First continents Jan 1, 1906 First oceans Jan 1, 1908 First atmosphere Jan 1, 1911 Photosynthesis begins Jul 1, 1911 Formation of first rocks Jan 1, 1934 Rodinia forms Jan 1, 1936 first oxygen Jul 1, 1939 Rodinia breaks apart Jul 1, 1939 Snowball earth Jan 1, 1940 First organisms Oct 1, 1940 First vertebrates Oct 13, 1940 First fish Mar 22, 1942 First winged insects Jun 29, 1942 First amphibians Jan 1, 1943 First plants Feb 27, 1943 First cockroaches Jul 1, 1943 Pangaea forms Oct 1, 1943 First Dinosaurs Oct 15, 1943 First reptiles Apr 1, 1944 Pangaea breaks up Jul 1, 1944 First birds Oct 1, 1944 First mammals May 8, 1946 Dinosaur extinction Aug 12, 1946 Modern day continents form Aug 22, 1946 First large primates Dec 31, 1946 Today