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10 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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geological timescale
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22 trilobites appear 23 shelled brachiopods appear
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1 There is very little plant life during this period 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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24 eurypterids (sea scorpions), 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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31 Huge plants begin to develop, early amphibians form 37 Age of fishes, fish that can breath out of water and spend time on land form
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2 swamps and forests cover the land 15 coal deposits form
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4 Giant cockroaches appear 21 Early reptiles resembling lizards appear
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8 Appalachian Mountains are created because of the collision pf tectonic plates & savannahs form 38 environmental change causes mass extinction of sea invertebrates (trilobites & eurypterids) as the seas retreat
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16 welcome to the world of dinosaur! Enter the squirrel sized dinosaur & the first forest 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 dinos are getting big & dominate the land - lizard-hipped and bird-hipped appear - 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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17 Flying squirrels, whales and bats appear 25 world wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit)
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6 Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding 27 Many early mammal become extinct, 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 forseca 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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9 Homosapien (modern humans) appeared & are hunters 20 Species that did not evolve to survive extreme cold moved to warmer climate areas pr become extinct (dire wolf & giant ground sloth)
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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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7 Some scientists believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere 14 There is an argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800's other think it began with the atomic age in the 1950's
