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The presence of stromatolites in some very old rocks can help scientists determine the absolute age of those rocks back to about

The presence of stromatolites in some very old rocks can help scientists determine the absolute age of those rocks back to about
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the presence of stromatolites in some very old rocks can help scientists determine the absolute age of those rocks back to about

User Jason Spake
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 is one of your choices 3.5 billion years 
User Oneirois
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