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The Stenian Period ( STEE-nee-ən, from Ancient Greek: στενός, romanized: stenós, 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. It is preceded by the Ectasian Period and followed by the Neoproterozoic era and the Tonian period.
The supercontinent Rodinia assembled during the Stenian. It would last into the Tonian period before breaking up in the Cryogenian.
This period includes the formation of the Keweenawan Rift at about 1100 Mya.
Fossils of the oldest known sexually reproducing organism, Bangiomorpha pubescens, first appeared in the Stenian.




See also


Boring Billion – Earth history, 1.8 to 0.8 billion years ago
Riphean (stage) – stage in the geological timescale named after the UralsPages displaying wikidata descriptions as a fallback




Notes






References


"Stenian Period". GeoWhen Database. Archived from the original on May 12, 2006. Retrieved January 5, 2006.
James G. Ogg (2004). "Status on Divisions of the International Geologic Time Scale". Lethaia. 37 (2): 183–199. doi:10.1080/00241160410006492.

Kata Kunci Pencarian:

• Reproduksi seksual
• Stenium
• Steny Hoyer
• Stenian
• Tonian
• Bangiomorpha
• Mesoproterozoic
• Timeline of natural history
• Geologic time scale
• List of time periods
• Permian
• Siberia (continent)
• Triassic

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