History of 1e16 s

	Revision 4 . . November 27, 2001 5:27 am by Eob [Snowball Earth ]
	Revision 3 . . November 26, 2001 3:09 pm by Eob [first complex multicelled lifeforms]
	Revision 2 . . November 26, 2001 2:55 pm by Eob [Precambrian]
	Revision 1 . . November 26, 2001 2:53 pm by Eob

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Difference (from prior major revision) (no other diffs)

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