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100
Cambrian Period
Cambrian Period - part of Paleozoic Era -
Period: 100 to 500
Paleozoic Era
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Period: 500 to Mar 8, 700
Mesozoic
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Mar 8, 600
Jurassic Period
Part of the Mesozoic Era -
Mar 8, 700
Cretaceous Period
Cretacious Period part of Mesozoic Era -
Period: Mar 8, 700 to Mar 8, 800
Cenozoic Era
Contains Paleogene and Neogene Periods
70 million years to present.