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Our hard-to-pronounce Mystery Fossil is a kind of cyanobacteria, or “blue-green algae”—it is not a Tootsie Roll. Hard to believe that bacteria can leave fossils at all, but they do. Cyanobacteria, which tend to be larger than other bacteria, may secrete a thick cell wall and sometimes form colonial mats. Find out more about bacteria in the fossil record here.
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