
No evolution for 3.5 billion years?
Stromatolites are regarded by many as the oldest fossils on earth. They are
interpreted as the remains of colonies of blue-green algae, or more accurately,
cyanobacteria. The oldest ones are claimed to be 3.5 billion years old. Within
this evolutionary perspective, one would expect these colonies to have radically
changed, but remarkably, they are essentially the same today. Stromatolites,
therefore, are classic examples of living fossils.
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29 Jul, 201501:01