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formation of earth, divided into three eons: hadean, arhean and proterozoic.
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geological timescale
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first fungi appear trilobites are dominant
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siluria extinction event first vertebrates appear
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first land plants appear, first jawed fishes appear
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first land animals, first amphinians appear
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a period of mass sediment deposited in the now state of missisipi
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earth enters warning age
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first reptiles appear first large cartilaginous fishes appear
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triassic extinction event pangea forms
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pangea cracks first mammals appear
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first birds appear. dinosours are dominant
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earth looks closer to presen day flowering plants appear
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first large mammals appear
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eocene- oligoecene extinction event
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mammals are dominant
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grass becomes widespread
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hominids appear
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earliest humans appear ice age begins
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humans activities start to have drought impact on earth geology and ecosystems