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EVENT 1 There is ery little plant life during this period. EVENT 10 The presence of stromatolites indicates that shallow seas covered much of Earth during intervals in this period
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Geological Timescale
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EVENT 22 Trilobites appear. EVENT 23 Shelled brachiopods appear
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EVENT 30 Colonies of tiny invertebrates call graptolites flourished and vertebrates appear, Fish did not have jaws or teeth and their bodies were covered with bony plates
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EVENT 24 Eurypterids (sea scorpians), sea stars and corral become more common. EVENT 33 Vascular land plants and animals, such as scorpions begin to evolve on land
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EVENT 32 Huge plants begin to develop, early amphibians form. EVENT 37 Age of fishes, fish that breathe out of water and spend time on land form
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EVENT 2 Swamps and forests cover the land. EVENT 13 Coal deposits form
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EVENT 4 Giant cockroaches appear. EVENT 21 Early reptiles resembling large lizards appear
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EVENT 8 Appalachian Mountains are created because of the collision of tectonic plates and savannas form. EVENT 38 Environmental changes cause mass extinction of sea invertebrates (trilobites & eurypterids) as sea retreats
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EVENT 16 Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling mammals appear. EVENT 34 Icthyosaurs are living in the ocean, new invertebrates call ammonite develop
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EVENT 3 Flying reptiles called pterosaurs are in the air now. EVENT 16 Whoa those dinos are getting big & dominate the land - Lizard-hipped and bird-hipped appear - carnivores and herbivores have arrived
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EVENT 5 First flowering plants appear - angiosperm. EVENT 35 Impact hypothesis - dinosaur mass extinction
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EVENT 29 Small rodents evolve. EVENT 12 First primates evolve
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EVENT 17 Flying squirrels, whales, and bats appear. EVENT 25 Worldwide temperatures drop about 4 degrees celcius
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EVENT 6 Himalayas develop due to uplifting cause by the indian subcontinent and Eurasian continents colliding. EVENT 27 Many early mammal become extinct, clams and snails flourish
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EVENT 32 Antarctica ice caps begin to form. Mediterranean Sea dries up and refills several times due to tectonic forces dropping sea levels
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EVENT 26 First modern horses appear. EVENT 18 Variuos species migrated between continents using land bridges
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EVENT 9 Homosapien (modern humans) appeared & are hunters. EVENT 20 Species that did not evolve to survive extreme cold moves to warmer climate areas or became extinct (dire wolf & giant sloth)
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EVENT 19 The last glacial period ended and sea levels rose, Great Lakes formed. EVENT 28 Modern human developed agriculture and used tools made of bronze and iron
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EVENT 13 Scientists arent sure when this epoch began, some say in the 1800s some say in the 1950s. EVENT 7 Scientist believe humans has caused extinction of plants and animals, polluted the oceans and altered the atmosphere
