Answers

2016-01-17T15:40:48+08:00
The oldest known fossil is a stromatolite (meaning "mattress rock" in Greek) dating to 2.74 billion years ago. A stromatolite is a layered accretionary structure created when bacteria, especially photosynthetic cyanobacteria, trap layers of sediment between the biofilms they create.

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2016-01-18T00:26:50+08:00
Well the oldest fossil is known to be as stromatolite :)                                                              







                  
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