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10 - The presence of stromatolites indicates that shallow seas covered much of earth during intervals in this period. 11 - Nearly half of the valuable mineral deposits in the world occur in the rocks this period.
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Geological Timescale
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23 - Shelled brachiopods appear. 22 - Trilobites appear.
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30 - Colonies of tiny invertebrates call graptolites florished and vertibrates appear, fish did not have jaws or teeth and their bodies were covered with bony plates. 1 - There is very little plant life during this period.
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24 - Eurypterids, sea stars and coral become more common. 33 - Vascular land plants and animals, such as scorpions begin to evolve on land.
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37 - Age of fishes, fish can breath out of the water and spend time on land form. 31 - Huge plants begin to develop, early amphibians form.
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2 - Swamps and forests cover the land. 4 - Giant cockroaches appear. 21 - Early reptiles resembling large lizards appear. 15 - Coal deposits form.
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38 - Environmental change causes mass extinction of sea invertibrates as the seas retreat. 8 - Appalachian Mountains are created because of the collision of tectonic plates and savannahs form.
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16 - Welcome to the world of the dinosaur! Enter the squirrel sized dinosaur and the first dwelling mammals appear. 34 - Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop.
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3 - Flying reptiles called pterosaurs are in the air now. 13 - Whoa those dins are getting big and dominate the land - lizard-hipped and bird-hippedappear - carnivores and herbivores have arrived.
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5 - First flowering plants appear - angiosperm. 35 - Impact hypothesis - dinosaur mass extinction.
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12 - First primates evolve. 29 - Small rodents evolve.
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25 - World wide temperatures drop to about 4 degrees celsius. 17 - Flying squirrels, whales and bats appear.
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6 - Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding. 27 - Many early mammal become exinct, clams and snails flourish.
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32 - Antarctic icecaps begin to form. 36 - Mediterranean sea dries up and refills several times due to tectonic forcesa dn 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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20 - Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct. 9 - Homosapien appeared and are hunters.
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19 - The last glacial period ended and sea levels rose, Great lakes formed. 28 - Modern human developed agriculture and used tools made of bronze and iron.
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14 - There is argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800's others think it began with the atomic age in the 1950's. 7 - Some scientist believe that human kind ha caused mass extinctions of planet and animal species, polluted the oceans and altered the atmosphere.
