The Rhyacian (pronounced /raɪˈeɪsiən/, Greek: Ρυαξ (rhyax), meaning "stream of lava") is the second geologic period in the Paleoproterozoic Era and lasted from 2300 Ma to 2050 Ma (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.
Huronian glaciation period ended in late Rhyacian 2100 Ma.
The first known Eukaryotes began to evolve in the Rhyacian period.
References
- "Rhyacian Period". GeoWhen Database. http://www.stratigraphy.org/geowhen/stages/Rhyacian.html. Retrieved on January 5, 2006.
- James G. Ogg (2004). "Status on Divisions of the International Geologic Time Scale" ([dead link] – Scholar search). Lethaia 37: 183–199. doi:. http://www.stratigraphy.org/precambrian/Ogg_2003.pdf.
| Preceded by Archean eon | 2.5 Ga - Proterozoic eon - 542 Ma | Followed by Phanerozoic eon | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2.6 Ga - Paleoproterozoic era - 1.6 Ga | 1.6 Ga - Mesoproterozoic era - 1.0 Ga | 1.0 Ga - Neoproterozoic era - 542 Ma | |||||||||
| Siderian | Rhyacian | Orosirian | Statherian | Calymmian | Ectasian | Stenian | Tonian | Cryogenian | Ediacaran | ||
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