Paleoproterozoic Definition
pālē-ō-prŏtər-ə-zōĭk, -prōtər-
adjective
Of, relating to, or being the oldest of the three eras of the Proterozoic Eon, from approximately 2.5 billion to 1.6 billion years ago, marked by the formation of stable continents and the appearance of cyanobacteria.
American Heritage
noun
The Paleoproterozoic Era.
American Heritage
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