What are they and when did they originate?

-- Randy Rosenthal (rrosenth@oswego.edu), March 30, 2001

Answers

Stromatolites are bacteria dating back to the early Archaean (about 3.5 b.y.). Although not common, they are still around today! Check out: http://www.ucmp.berkeley.edu (At the search icon type "stromatolite")

-- Erika Whittemore (ewhittem@oswego.edu), April 09, 2001.

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-- fred flinstone (fred@hotmail.com), May 10, 2001.