Earth:Statherian

From HandWiki
Short description: Fourth and last period of the Paleoproterozoic Era
Statherian
1800 – 1600 Ma
Paleoglobe NO 1740 mya.gif
Paleoglobe of the Earth during the Statherian
Chronology
Etymology
Name formalityFormal
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitPeriod
Stratigraphic unitSystem
Time span formalityFormal
Lower boundary definitionDefined chronometrically
Lower boundary GSSPN/A
GSSP ratifiedN/A
Upper boundary definitionDefined chronometrically
Upper boundary GSSPN/A
GSSP ratifiedN/A

The Statherian Period ( /stəˈθɪəriən/; Ancient Greek:, meaning "stable, firm") is the final geologic period in the Paleoproterozoic Era and lasted from 1800 Mya to 1600 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.[1][2]

The period was characterized on most continents by either new platforms or final cratonization of fold belts. Oxygen levels were 10% to 20% of current values.[3]

Rafatazmia, controversially[4] claimed to be present in Statherian beds in India , may be the oldest known confirmably eukaryotic fossil organism.[5]

By the beginning of the Statherian, the supercontinent Columbia had assembled.

See also

References

  1. "Statherian Period". GeoWhen Database. http://www.stratigraphy.org/geowhen/stages/Statherian.html. 
  2. James G. Ogg (2004). "Status on Divisions of the International Geologic Time Scale". Lethaia 37 (2): 183–199. doi:10.1080/00241160410006492. 
  3. Holland, Heinrich D. (2006). "The oxygenation of the atmosphere and oceans". Philosophical Transactions of the Royal Society: Biological Sciences 361 (1470): 903–915. doi:10.1098/rstb.2006.1838. PMID 16754606. PMC 1578726. http://rstb.royalsocietypublishing.org/content/361/1470/903.full.pdf. 
  4. Kumar, S. (2009). "Controversy concerning 'Cambrian' fossils from the Vindhyan sediments: a re-assessment". Journal of the Palaentological Society of India 54 (1): 115–117. http://palaeontologicalsociety.in/vol54_1/v10.pdf. 
  5. Bengtson, Stefan; Sallstedt, Therese; Belivanova, Veneta; Whitehouse, Martin (2017). "Three-dimensional preservation of cellular and subcellular structures suggests 1.6 billion-year-old crown-group red algae". PLOS Biology 15 (3): e2000735. doi:10.1371/journal.pbio.2000735. PMID 28291791.