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geological timescale
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- The presence of stromatolites indicates that shallow seas covered much of the earth during intervals in this period. 11 Nearly half of the valuable mineral deposits in the world occur in the rocks of this period
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- Trilobites appear 23 Shelled brachiopods appear.
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1 there is very little plant life 30 colonies of tiny invertebrates call graptolites flourished and vertebrates appear
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33 vascular land plant and animals 24 eurypterids sea tars and coral become more common
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31 huge plants begin to develop early amphibians form 37 ages of fishes fish that can breath out of water and spend time on land form
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2 swamps and forest cover the land. 21 early reptiles resembling large lizards appear
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4 giant cockroaches appear 15 coal deposits form
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8 Appalachian mountains are created because of the collisions of tectonic plates and savannah forms. 38 environments change causes mass extinction of sea invertebrates
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16 welcome to the world of dinosaurs! enter the squirrel sized dinosaurs & the fish forest dwelling mammals appear. 34 ichthyosaurs are living in the ocean, new invertebrates call ammonite develop
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13 whoa those dinos are getting big and dominate the land - lizard-hipped and bird- hipped appear carnivores and herbivores have arrived. 3 Flying reptiles called pterosaurs are in the air now.
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35 Impact hypothesis dinosaurs mass extinction. 5 First flowering plants appear - angiosperm
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19 the last glacial period ended and sea levels rose, the great lakes formed 28 Modern human developed agriculture and used tools made of bronze and iron.
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12 First primates evolve. 29 small rodents evolve
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17 Flying squirrels, whales and bats appear. 25 World wide temperature drops about 4 degrees celsius (39.2 degrees fahrenheit)
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27 Many early mammal become extinct, clams and snails flourish 32 antarctic icecaps begin to form.
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32 Antarctic ice caps begin to form 36 Mediterranean sea dries up and refills several times due to plate tectonic forces and dropping sea levels.
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18 various species migrated between continents across land bridges. 26 First modern horses appear.
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9 Homosapien (modern humans) appeared & and hunters 20 species that did not evolve to survive extreme cold moves to warmer climates areas or became extinct
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7 some scientist believe that human kind has caused mass extinctions of plants and animal species, polluted the oceans and altered the atmospheres. 14 there is argument as to when this epoch began, somen scientist think it began with the industrial age in the early 1800s others thin it began with the atomic age in the 1950s
