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Earth Sciences 14 Online
OpenStudy (anonymous):

The Phanerazoic Eon is divided into Eras based on Question 6 options: the law of superposition evidence of mass extinctions or explosions of life layers of rocks absolute dating techniques

OpenStudy (astrophysics):

I like to use this pic, notice how the eras are highly dependant on when species had gone extinct and when species had appeared |dw:1447930904036:dw|

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