Rhyacian

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The Rhyacian (/rˈsiən/; 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.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
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