SME
Historical Geology
Earth history
Use this for “Put the Hadean, Archean, Proterozoic and the three Phanerozoic eras in order. How long did each last?”
Put in order
Put the eons and eras in order, oldest first.
1
?
2
?
3
?
4
?
5
?
6
?
Assumptions
•
The Phanerozoic’s three eras fill only the last 539 million years.
•
Eons are the longest divisions; the Phanerozoic eon is divided into eras by the end-Permian and end-Cretaceous mass extinctions.
•
Each span is the older boundary less the younger one (ICS chart, rounded); together they make Earth’s 4,600 Myr.
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