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Added: 13a14
* 580 million years -- time since end of possible Snowball Earth ice age
Added: 14a16,17
* 750 million years -- time since beginning of possible Snowball Earth ice age * 2300 million years -- time since first known ice age
To help compare orders of magnitude of different times this page lists times between 1016 seconds and 1017 seconds (320 million years and 3200 million years)