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Rhyacian The Rhyacian (; (ギリシア語:Ρυαξ (''rhyax'')), meaning "stream of lava") is the second geologic period in the Paleoproterozoic Era and lasted from Mya to Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. The Bushveld Complex and other similar intrusions formed during this period.〔 The Huronian (Makganyene) global glaciation began at the start of the Rhyacian and lasted until 2200 Mya The first known eukaryotes began to evolve in the Rhyacian period. The multicellular Francevillian Group Fossils, at 2.1-Gyr-old are from the Rhyacian period. == References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Rhyacian」の詳細全文を読む
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