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About 250 millon years ago there was on big continent called pangea
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the permio-triassic extinction period occured
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mammals started to appear but most of them died out at the end of the triassic period
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pangea started to break up and the triassic period was comming to extinction with volcanic eruptions
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the jurasic period began
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dinasours dominated the land with the t-rex and others. there was a minor extinction in wich more than 80 percent of the marine life died out
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early mammals were diversefying the jurrasic period
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the jurrasic period was coming to an end but there wasnt as big as an extinction
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the cretaceous period began huge carnivours started to appear like the t rex and the triceritops
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mammals started flourishing and flowering plants radically changed to landscape
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the cretaceous period ended with a bang wiped out almost all of the animals except for the birds
