Stenian

Short description: Third and last period of the Mesoproterozoic Era

Stenian

1200 – 1000 Ma

Had'n

Archean

Proterozoic

Pha.

Paleoglobe of Earth during the late Stenian, c. 1040 Ma

Chronology

Template:Stenian graphical timeline

Etymology
Name formality| Formal
Usage information
Celestial body| Earth
Regional usage| Global (ICS)
Time scale(s) used| ICS Time Scale
Definition
Chronological unit| Period
Stratigraphic unit| System
Time span formality| Formal
Lower boundary definition| Defined chronometrically
Upper boundary definition| Defined chronometrically

The Stenian Period (/ˈstiːni.ən/ STEE-nee-ən, from Ancient Greek:, meaning "narrow") is the final geologic period in the Mesoproterozoic Era and lasted from 1200 Mya to 1000 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. The name derives from narrow polymetamorphic belts formed over this period.

Preceded by the Ectasian Period and followed by the Neoproterozoic Era.

The supercontinent Rodinia assembled during the Stenian. It would last into the Tonian Period.

This period includes the formation of the Keweenawan Rift at about 1100 Mya.[2]

Fossils of the oldest known sexually reproducing organism, Bangiomorpha pubescens, first appeared in the Stenian.[3]

## See also

* Earth:Boring Billion - Earth history, 1.8 to 0.8 billion years ago
* Earth:Riphean (stage)

## Notes

1. ↑ 1.0 1.1 Plumb, K. A. (June 1, 1991). "New Precambrian time scale". Episodes 14 (2): 139–140. doi:10.18814/epiiugs/1991/v14i2/005.
2. ↑ "Organic geochemical study of mineralization in the Keweenawan Nonesuch Formation at White Pine, Michigan". University of Michigan. http://deepblue.lib.umich.edu/bitstream/2027.42/28843/1/0000678.pdf.
3. ↑ Gibson, Timothy M; Shih, Patrick M; Cumming, Vivien M; Fischer, Woodward W; Crockford, Peter W; Hodgskiss, Malcolm S.W; Wörndle, Sarah; Creaser, Robert A et al. (2017). "Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis". Geology 46 (2): 135–138. doi:10.1130/G39829.1. https://authors.library.caltech.edu/83811/3/2018030.pdf.

## References

* "Stenian Period". GeoWhen Database. http://www.stratigraphy.org/geowhen/stages/Stenian.html.
* James G. Ogg (2004). "Status on Divisions of the International Geologic Time Scale". Lethaia 37 (2): 183–199. doi:10.1080/00241160410006492.

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