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Precambrian Time 4600 MYA
The earth formed from planetary nebula. oldest age-dated rocks on earth. Fossil algae and stromatolites(prokaryotes). Fossil evidence of bacteria. Fossil evidence of cells with a nucleus. First multi-celled organisms (seaweed and algae. oldest marine worms and jellyfish. -
Period: to
Geological Time Scale in One Calender Year
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Oragin of Life (first Cell) 3900 MYA
3900 million years ago -
Prokaryotes 3600 MYA
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Eukaryotes 2100 MYA
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Paloezoic era 544 MYA
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Cambrian Period 544 MYA
Burgess Shale anlimals. Animals with a notochord -
Ordovician period 544 MYA
first fish. first fossil evidence of land plants -
Silurian period 438 MYA
first vascular land plant. oldest lung fish fossil. -
Devonian period 408 MYA
oldest fossil evidence of mosses. first insect. first lobe-finned fish. first land animals. first sharks. first seed plant. -
MIssissippian Period 360 MYA
First possible reptiles. -
Pennsylvanian Period
Permain system begins. Snail backed reptiles (Dimetrodon). End of paleozoic. 96% of all life on earth parishes -
Mesozoic ERa "The age of reptiles" 245 MYA
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Triassic Period 245 MYA
First crocodiles. First dinosaurs. First mammals (shrew like). First turtles. -
Jurassic Period 208 MYA
Dilophosaurus, early dinosaur. First bird - Archeopteryx. Apatosaurus and Brachiosaurus. Stegosaurus. -
Cretaceous Period 144 MYA
First flowering plant. Duck-billed dinosaurs. Protoceratops. Tyrannosaurus rex. Velociraptor> End of Mesozoic, probaly metor and comet impact. -
Cenozoic Era- The age of mammals- 65 MYA
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Teriary Period 65 MYA
First ancestors of dogs and cats 64 MYA. Grasses Become widespread-60 MYA. First ancestors of pigs and deer 57 MYA. First Horses - 55 MYA. First ancestors of rabbits 45 MYA. First monkeys - 39 MYA. oldest Human like ancestor (hominids) -4 MYA. -
Quaternary Period 2 MYA
First ice age -1 MYA. Oldest direct Human-ancestor fossil, Homo Habilis - 1 MYA. First modern man, Homo sapiens - 0.1 MYA. Mammoth and mastodon bones - .05 MYA. Revolutionary war -235 years ago. World war II- 70 Years ago.