|This photo (field of view about 0.15 millimeter in width) is of an
exceptionally preserved eukaryotic fossil from the Doushantuo Formation
(635-551 million years old) in South China. High-resolution geochemical
data from the Doushantuo Formation indicate that the early
diversification of eukaryotes may have coupled with episodic oxygenation
of Ediacaran oceans.
Credit: Photograph by Shuhai Xiao