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geological timescale
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Trilobites appear and shelled brachiopods appear.
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Eurypterids meaning sea scorpions, sea stars and coral become more common
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Huge plants begin to develop, early amphibians form.
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Appalachian Mountains are created because of the collision of tectonic plates and savannah forms.
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first flowering plants appear- angiosperm. Impact hypothesis- dinosaur mass extinction.
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various species migrated between continents across land bridges. First modern horses appear.
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Flying squirrels,whales, and bats appear.
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flying reptiles are in the air called pterosaurs.
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squirrel sized dinosaur and the first forest dwelling mammals appear. This is called ichthyosaurs
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Swamps and forest cover the land, Early reptiles resembling large lizards appear
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Very little plant life during this period. Fish did not have jaws nor teeth and their bodies were covered with bony plates.
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Giant cockroaches appear, Coal deposits form.
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Fist primates evolve. Small rodents evolve.
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Himalayas develop due to uplifting caused by the indian subcontinent and eurasian continents colliding
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Homosapien appeared and are hunters. Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct.
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Antarctic icecaps begins to form. Mediterranean Sea dries up and refills several times due to tectonic forcesa dn dropping sea levels
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The last glacial period ended and sea levels rose, Great lakes formed. Modern human developed agriculture and used tools made of bronze and iron
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Some students believe that human kind has caused mass extinctions of plant and animal species,pollutes the oceans, and altered the atmosphere. There is an 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 1950s
