StromatoliteStromatolites are layered accretionary structures formed in shallow water by the trappin
StromatoliteStromatolites are layered accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria (blue-green algae). Stromatolites provide the most ancient records of life on Earth by fossil remains which date from more than 3.5 billion years ago. -- source link
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