Rhyacian

Template:Short description Template:Infobox geologic timespan The Rhyacian Period (Template:IPAc-en; Template:Langx, meaning "stream of lava") is the second geologic period in the Paleoproterozoic Era and lasted from Template:Period start Mya to Template:Period start Mya (million years ago).<ref name="geowhen">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Instead of being based on stratigraphy, these dates are defined chronometrically.<ref name="ogg">Template:Cite journal</ref>

The Bushveld Igneous Complex and some other similar intrusionsTemplate:Specify formed during this period.<ref name="ogg"/>

The Huronian (Makganyene) global glaciation began at the start of the Rhyacian and lasted 100 million years. It lasted about 80% of this period.<ref>Template:Cite journal</ref>

For the time interval from 2250 Ma to 2060 Ma, an alternative period based on stratigraphy rather than chronometry, named either the Jatulian or the Eukaryian, was suggested in the geological timescale review 2012 edited by Gradstein et al.,<ref name="Gradstein_et_al_2012">Template:Cite book</ref> but Template:As of, this has not yet been officially adopted by the IUGS. The term Jatulian is, however, used in the regional stratigraphy of the Paleoproterozoic rocks of Fennoscandia.<ref name="Bingen2015">Template:Cite journal</ref>

This is when the eukaryotes are thought to have originated from the symbiosis between asgardarchaea and alphaproteobacteria, as well as the sexual reproduction found within the eukaryotes only, thus the alternative name Eukaryian.<ref>Template:Cite journal</ref><ref name="Mand2020">Template:Cite journal</ref><ref name="vankranendonk2012">Template:Cite book</ref> Macroscopic life is discovered to have started during the Rhyacian period.<ref>Template:Cite journal</ref><ref>https://phys.org/news/2024-07-complex-life-earth-began-billion.html</ref>

References

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