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Ancient 'Reef' Stirs Debate Over Early Signs of Life in Australian Rocks,
Science
 









Excerpts: When paleontologists seek the roots of life, they head to rocks of the
Archaean Eon, which range from 3.8 billion to 2.5 billion years old. (...)  an
exception was a familiar-looking structure called a stromatolite, which has a
modern analog formed by cyanobacteria. But when computer models suggested that
simple chemical reactions and physical forces can mimic stromatolites, those
fossils too were cast in doubt.   (...)  evidence that bacteria were indeed
thriving 3.4 billion years ago and created an enormous reef. (...) stromatolites
were so diverse and complex that they must have been alive.
Source: Ancient 'Reef' Stirs Debate Over Early Signs of Life in Australian
Rocks[ http://www.sciencemag.org/cgi/content/full/312/5779/1457 ], Erik
Stokstad, DOI: 10.1126/science.312.5779.1457, Science Vol. 312. no. 5779, p.
1457, 06/06/09

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