History of Precambrian

	Revision 7 . . November 26, 2001 9:13 pm by Paul Drye [Link SSF and Snowball Earth. No article on the former (yet).]
	Revision 6 . . November 26, 2001 6:24 pm by AxelBoldt [Make clear what notion of "billion" we are using here]
	Revision 5 . . (edit) November 26, 2001 7:06 am by Eob
	Revision 4 . . November 26, 2001 6:59 am by Eob [link to order of magnitude]
	Revision 3 . . (edit) July 31, 2001 11:05 pm by Don Kenney

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