Rhyacian Period
Rhyacium
rhyaciano
Paleoproterozoic Era
Ryaciense
Riak
Siderian Period
Riacis
rhyaci
Rhyaciën
Rhyak
Riaciano
Base of Rhyacian
リヤシアン紀
Ryasium
Precambrian Supereon
Rhyacian
层侵纪
Proterozoic Eon
Ryak
Rhyac
rhyacium
rhyacij
Rhyacien
Rhyacien
Base of Orosirian
ryacium
Orosirian Period
a2.1.3.3
Geologic Time Scale (2019)
younger bound -2050 Ma
Риац
older bound -2300 Ma