Mesoproterozoic Definition
mĕzō-prŏtər-ə-zōĭk, -prōtər-, mĕs-
adjective
Of, relating to, or being the middle of the three eras of the Proterozoic Eon, from approximately 1.6 billion to 1.0 billion years ago, marked by the formation of the first known supercontinent and the evolution of sexual reproduction.
American Heritage
noun
The Mesoproterozoic Era.
American Heritage
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