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Ancient Microorganisms Helped Build 3.4-billion-year-old Stromatolite Rock Structures

If microorganisms are required to produce stromatolites, then is the presence of stromatolites on other planets also evidence of microorganisms there?

'Stromatolites are dome- or column-like sedimentary rock structures that are formed in shallow water, layer by layer, over long periods of geologic time. Now, researchers from the California Institute of Technology (Caltech) and the Jet Propulsion Laboratory (JPL) have provided evidence that some of the most ancient stromatolites on our planet were built with the help of communities of equally ancient microorganisms, a finding that "adds unexpected depth to our understanding of the earliest record of life on Earth," notes JPL astrobiologist Abigail Allwood, a visitor in geology at Caltech.'
 
 

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