Rhyacian
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The Rhyacian (
/raɪˈeɪsiən/; Greek: Ρυαξ (rhyax), meaning "stream of lava") is the second geologic period in the Paleoproterozoic Era and lasted from 2300 Mya to 2050 Mya (million years ago).[1] Instead of being based on stratigraphy, these dates are defined chronometrically.[2]
The Bushveld Complex and other similar intrusions formed during this period.[2]
The Huronian (Makganyene) global glaciation began at the start of the Rhyacian and lasted until 2200 Mya[3]
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.[4]
[edit] References
- ^ "Rhyacian Period". GeoWhen Database. Archived from the original on August 19, 2006. http://web.archive.org/web/20060819001043/http://www.stratigraphy.org/geowhen/stages/Rhyacian.html. Retrieved January 5, 2006.[dead link]
- ^ a b James G. Ogg (2004). "Status on Divisions of the International Geologic Time Scale". Lethaia 37 (2): 183–199. DOI:10.1080/00241160410006492.
- ^ Kopp et al.; Kirschvink, JL; Hilburn, IA; Nash, CZ (August 2005). "The Paleoproterozoic Snowball: A climate disaster triggered by the evolution of oxygenic photosynthesis". PNAS 102 (32): 11131–6. Bibcode 2005PNAS..10211131K. DOI:10.1073/pnas.0504878102. PMC 1183582. PMID 16061801. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1183582.
- ^ El Albani, Abderrazak; Bengtson, Stefan; Canfield, Donald E.; Bekker, Andrey; Macchiarelli, Reberto (July 2010). "Large colonial organisms with coordinated growth in oxygenated environments 2.1 Gyr ago". Nature 466 (7302): 100–104. DOI:10.1038/nature09166. PMID 20596019.
| Preceded by Archean Eon | 2.5 Ga - Proterozoic Eon - 542 Ma | Followed by Phanerozoic Eon | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2.5 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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