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“proterozoic”
Proterozoic (proper noun)
The older Paleozoic faunal epoch, the age of primitive invertebrates: The Proterozoic marks the beginning of the Phanerozoic, between the Archean Eon and the Cambrian period, where rocks accumulated, oxygen buildup took place, and early forms of soft-footed animals came into being.
This entry is located in the following units:
proter-, protero- +
(page 1)
zoo-, zoa-, zo-, -zoic, -zoid, -zoite, -zoal, -zonal, -zooid, -zoon, -zoa, -zoan
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