Evolutionary Timeline By sal3197 120 Appearance of flowering plants Period: 150 to 200 Jurassic Period 202 Fourth mass extincton Period: 205 to 250 Triassic Period 240 The fiirst dinasours and mammals 250 Third mass extinction Period: 250 to Mar 2, 2022 Permian Period 350 Early reptiles 360 Second mass extinction Period: 360 to 410 Devonian Period 370 Early amphibians 400 Bony fishes become abundant. 440 First mass extinction 440 Plantsand anthropods invade land; jawed fishes first appear. Period: 445 to 505 Ordovician Period 500 Animal diversity abounds; first jawless fishes Period: 500 to Jan 1, 600 Cambrian Period Origin of all major animal phyla Period: 500 to 525 Ordovician Period Period: 505 to 540 Cambrian Period 520 Origin of all major animal phyla Period: 525 to 540 Precambrian Era Period: Jan 23, 600 to Jan 23, 3500 Precambrian Era Jan 1, 700 Earliest multicellular organisms Jan 1, 1000 Diverse protists Jan 1, 1500 First eukaryotes Jan 1, 1500 Early eukaryotes Jan 23, 1903 Appearance of Australopithecus Jan 23, 1920 Mammals abundant on land Jan 23, 1940 Major mammal groups evolve Jan 23, 1960 Birds and mammals spread Jan 23, 1965 Fifth mass extinction Period: Mar 2, 2022 to 445 Silurian Period Period: Mar 2, 2022 to 360 Carboniferous Period Jan 1, 2500 Origin of O2 by photosynthesis Jan 1, 2750 Earliest fossil bacteria