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Precambrian, Paleozoic, Mesozoic, and Cenozoic Facts

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Time span of the Precambrian Period
4600 to 542 MYA
Time span of the Paleozoic era
488.3 to 251 MYA
Time span of the Mesozoic era
199.6 to 65.5 MYA
Time span of the Cenozoic era
55.8 MYA to now
Precambrian
The earth formed
Precambrian
Life arose
Precambrian
The first tectonic plates began to move
Precambrian
Eukaryotic cells evolved
Precambrian
The atmosphere became enriched in oxygen
Paleozoic
Cambrian Explosion
Paleozoic
Largest mass extinction in history
Paleozoic
The 6 major continents appeared
Paleozoic
First winged insects appeared
Paleozoic
First vertebrates appear
Mesozoic
Dinosaurs appeared
Mesozoic
First mammals appeared
Mesozoic
Forests were lush
Mesozoic
First birds appear
Mesozoic
Flowering plants appeared
Mesozoic
Ended with the extinction of dinosaurs
Mesozoic
High tectonic and volcanic activity
Mesozoic
248 to 65 mya
Cenozoic
Hominins appeared
Cenozoic
Ice ages occured
Cenozoic
Flowering plants became dominant
Cenozoic
Humans established civilization
Cenozoic
Mass extinction of large mammals
Cenozoic
Most recent
Cenozoic
Spans about 65 million years
Cenozoic
Mammals became most dominant land
Cenozoic
Starts from the extinction of non-avian dinosaurs
Cenozoic
The first humans (homo sapiens) evolved
Cenozoic
Minor extinction 36 mya