Proterozoic

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Related to Proterozoic era: Mesozoic era, Palaeozoic Era, Precambrian era, Cambrian era

Proterozoic

[¦präd·ə·rə¦zō·ik]
(geology)
Geologic time between the Archean and Paleozoic eras, that is, from 2500 million to 550 million years ago. Also known as Algonkian.