Modeling Earth's History By wintetey000 4600 BCE M: Formation of the Earth Period: 4600 BCE to 3800 BCE Hadean Era 4100 BCE L: Rapid Growth of Continents Period: 3800 BCE to 2500 BCE Archaean Era Brown 3500 BCE 23: Life (bacteria-prokaryotes) 2700 BCE 22: Eukaryotes Period: 2500 BCE to 570 BCE Proterozoic Era White 2400 BCE K: Free Oxygen Building Up in the Atmosphere (about .2%) 2100 BCE 21: Multi-cellular Organisms (algae) 600 BCE 20: Soft-bodied Animals Period: 570 BCE to 245 BCE Paleozoic Era Orange 540 BCE 19: Animals with hard shells 500 BCE 18: Vertebrates (jawless fish) 430 BCE 17: Land Plants 400 BCE 16: Land Animals (insects) 380 BCE K: Free Oxygen Nears Present Levels (21%) 360 BCE 15: Amphibians 320 BCE I: Extensive Coal Deposits (North America and Europe) 310 BCE 13: Reptiles 290 BCE H: Formation of Supercontinent Pangea Period: 245 BCE to 208 BCE Triassic Period Light Blue 215 BCE 12: Dinosaurs 210 BCE 11: Mammals Period: 208 BCE to 146 BCE Jurassic Period Red 200 BCE G: Breakup of Pangea and Formation of the Atlantic Ocean 155 BCE 10: Birds Period: 146 BCE to 65 BCE Cretaceous Period Purple 130 BCE 9: Flowering Plants 70 BCE F: Formation of Rocky Mountains 65 BCE E: Cretaceous/Tertiary Meteor Impact Period: 65 BCE to 2 Cenozoic Era 55 BCE 8: Primates 45 BCE D: Formation of the Himalayan Mountains 45 BCE C: Separation of Antarctica and Australia 35 BCE 7: Monkeys 6 BCE 6: Hominids 3 BCE 5: "Lucy" (Australopithecus) 2 BCE B: Land Bridge Between North and South America 2 BCE 4: Manufactured Stone Tools 1 BCE 3: Neanderthals 1 CE A: Most Recent Ice Age 1 CE 2: Modern Humans 1 CE 1: Pictograms- Earliest Written Communication
