Wayne Wurtsbaugh
Registered: January 2000
Posts: 511
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Stromatolites are formed when cyanobacteria grow and cement together carbonate precipitates and sand grains. Typical growth of the structures is 1-mm/year.
Cyanobacteria are the most ancient know organisms on the earth. Stromatolites preserved in the geological strata provide the oldest know record of living organisms on earth (3.5 billion years)
Photo, October 2005
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