Rhyacian
Second period of the Paleoproterozoic Era
Rhyacian
The Rhyacian () is the second geologic period in the Paleoproterozoic Era. It spans 250 million years and lasted from 2300 to 2050 million years ago (Ma), following the Siderian Period and preceding the Orosirian Period. These dates are defined chronometrically rather than stratigraphically.
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