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Eras 7th Grade

Studying the 4 eras in the geological time scale
a data set by sbroach
created November 9, 2016
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EraTimeMeaningFact 1Fact 2Fact 3
Precambrian4.6 billion years ago to 541 myaNo meaningFossils extremely rareOldest eraMulticellular organisms evolved
Paleozoic542 mya to 251 myaAncient life96% of marine animals went extinctLife moved onto landFish appeared during this era
Mesozoic225 mya to 65 myaMiddle lifeDinosaurs lived and went extinct during this eraDominated by reptilesFlowering plants first appeared during this era
Cenozoic65 mya to the presentRecent lifeDominated by birds, mammals and flowering plantsEvolution of primatesHad ice ages
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