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Proterozoic (adj.)

1880, in geology, in reference to the period of the earliest fossil record of life on Earth, from protero- "former, earlier" + zoic "life." Now reckoned roughly as from 2,500 million years ago to 541 million years ago.

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Definitions of Proterozoic
1
proterozoic (adj.)
formed in the later of two divisions of the Precambrian era;
proterozoic life forms
2
Proterozoic (n.)
from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms;
Synonyms: Proterozoic eon / Proterozoic aeon
From wordnet.princeton.edu