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Trilobites appear, Shelled brachiopods appear
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Geological Timescale
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There is very little plant life during this period, Nearly half of the valuable mineral deposits in the world occur in the rocks of thisperiod
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Colonies of tiny invertebrates called graptolites flourished and vertebrates appear, fish did not have jaws or teeth and their bodies were covered with bony plates, There is very little plant life durring this period
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Coral deposits form, Eurypterids (sea scorpions), sea stars and coral become more common
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Age of the fishes, Fish that can breath out of water and spend time on land form,
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Coal deposits formed, Swamps and forests covered the land
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Appalachian Mountains are created because of the collision of tectonic plates & savannas form,
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Early reptiles resembling large reptiles appeared,
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Small rodents appear, Ichthyosaurs are living in the ocean, new invertebrates called ammonite develope
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Whoa those dinos are getting big & dominate the land - Lizard-hipped and bird-hipped appear - carnivores and herbivores have arrived, Flying reptiles called pterosaurs are in the air now
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First flowering plants appear - angiosperm, Impact hypothesis - dinosaur mass extinction
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Small rodents evolve, The first primates appear
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First modern horses appear, Flying squirrels, whales and bats appear
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World wide temperatures drop 4 degrees Celsius,
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Many early mammals become extinct, clams and snailscflourish,
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First modern horses appear, Various species migrated between continents across land bridges
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Homosapians appear and hunt, Huge icecaps begin to form
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Scientists state that we have caused a mass extinction by pouting the air and water, There is debate weather this period started in the 1800's or the 1950's
