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Part of Hall of Planet Earth.
AMNH/R.Mickens
An entire colony of microbes piled on one another over time, forming semi-rigid, upward-pointing, and branching columns mirrored in this 900-million-year-old stromatolite. Eventually, the structure was buried by slowly accumulating carbonate muds, visible here as the gray rock between the branches.
Gift from the Islamic Republic of Mauritania