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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 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 30 Colonies of tiny invertebrates call grapolites florished and vertebrates appeared, fish did not have jaws or teeth and their bodies were covered with bony plates.
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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 in the land
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31 Huge plants begin to develop, early amphibians form 37 Age of fishes, fish that can breath out of the water and spend time on land form
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2 Swamps and forests cover the land 21 Early reptiles resembling large lizards appear
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4 Giant cockroaches appear 15 Coal deposit forms
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8 Appalachian mountains are created because of the collision of tectonic plates and Savannahs form 38 Environmental change causes mass extinction of sea invertebrates as the seas retreat
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16 World of the dinosaur enters the squirrel-sized dinosaur and the first forest dwelling mammals appear 34 Ichthyosaurs are living in the ocean, new invertebrates called ammonite develop
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3 Flying reptiles called pterosaurs are in the air now. 1 Dinos are getting big and dominate the land - Lizard hipped and bird hipped appear - carnivores and herbivores have appeared
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5 First flowering plants appear - angiosperm 35 Impact hypothesis dinosaur mass extinction
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12 The first primate evolves 29 Small rodents evolve
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17 Flying squirrels, whales and bats appear 25 World temperature drops about 4 degrees celsius
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6 Himalaya develops due to uplifting caused by the Indian subcontinent and Eurasian continents colliding 27 Many early mammals become extinct, clams and snails flourish
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32 Antarctic ice caps begin to form 36 Mediterranean sea dries and refills due to 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 Homosapiens (modern humans) appeared and hunters 20 Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct.
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19 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 humankind 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 scientists think it began in the 1800's others think it began with the atomic age in the 1950's
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