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Rhyacian

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Title: Rhyacian  
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Subject: Paleoproterozoic, Late Cretaceous, Late Jurassic, Archean, Precambrian
Collection: Geologic Time Scale, Geological Periods, Paleoproterozoic, Proterozoic
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Rhyacian

The Rhyacian (; 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]

References

  1. ^ "Rhyacian Period". GeoWhen Database. Archived from the original on August 19, 2006. Retrieved January 5, 2006. 
  2. ^ a b James G. Ogg (2004). "Status on Divisions of the International Geologic Time Scale". Lethaia 37 (2): 183–199.  
  3. ^ Kopp; Kirschvink, JL; Hilburn, IA; Nash, CZ; et al. (August 2005). "The Paleoproterozoic Snowball: A climate disaster triggered by the evolution of oxygenic photosynthesis". PNAS 102 (32): 11131–6.  
  4. ^ 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.  


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