Proterozoic

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Proterozoic

that period of geological time lasting from some 2600 million to 589 million years ago; the part of Cryptozoic time excluding the Archaean Period. Fossils dating from this period are mainly CYANOBACTERIA.
References in periodicals archive ?
All the rock units date to the Late Proterozoic era and belong to the Pan-African Series except for the granite-granodiorite gneiss, which dates to an earlier part of the Proterozoic (Hassan and Hashad, 1990).
If the hours seem to streak by and each day ends too quickly, stop a moment and consider the tempo of time during the Proterozoic era, 900 million years ago.
Then sometime during the late Proterozoic era, about 580 million years ago, life got big.