Definitions from Wiktionary (Neoproterozoic)

▸ adjective:  (geology) Of a geologic era within the Proterozoic eon; comprises the Tonian, Cryogenian and Ediacaran periods from about 1000 to 544 million years ago, when algae and sponges flourished.
▸ noun:  (geology) The Neoproterozoic era.



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