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Third and last period of the Mesoproterozoic Era
Stenian
Paleoglobe of Earth during the late Stenian, c. 1040 Ma
−1200 —
–
−1180 —
–
−1160 —
–
−1140 —
–
−1120 —
–
−1100 —
–
−1080 —
–
−1060 —
–
−1040 —
–
−1020 —
–
−1000 —
–
← Large-scale mountain-building from continent-continent collision of the Grenvillian orogeny
[2]
← Development of the North American Midcontinent Rift
[3]
Events of the Stenian Period. Axis scale: millions of years ago.
Name formality Formal Celestial body
Earth Regional usage Global (
ICS ) Time scale(s) used ICS Time Scale Chronological unit
Period Stratigraphic unit
System Time span formality Formal Lower boundary definition Defined chronometrically Lower GSSA ratified 1991
[4] Upper boundary definition Defined chronometrically Upper GSSA ratified 1991
[4]
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.
[5]
Fossils of the oldest known sexually reproducing organism,
Bangiomorpha pubescens , first appeared in the Stenian.
[1]
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
^
a
b Gibson, Timothy M; Shih, Patrick M; Cumming, Vivien M; Fischer, Woodward W; Crockford, Peter W; Hodgskiss, Malcolm S.W; Wörndle, Sarah; Creaser, Robert A; Rainbird, Robert H; Skulski, Thomas M; Halverson, Galen P (2017).
"Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis" (PDF) . Geology . 46 (2): 135–138.
doi :
10.1130/G39829.1 .
^ McLelland, James M.; Selleck, Bruce W.; Bickford, M. E. (2010). "Review of the Proterozoic evolution of the Grenville Province, its Adirondack outlier, and the Mesoproterozoic inliers of the Appalachians". From Rodinia to Pangea: The Lithotectonic Record of the Appalachian Region .
doi :
10.1130/2010.1206(02) .
ISBN
9780813712062 .
^ Swanson-Hysell, Nicholas L.; Ramezani, Jahandar; Fairchild, Luke M.; Rose, Ian R. (2019). "Failed rifting and fast drifting: Midcontinent Rift development, Laurentia's rapid motion and the driver of Grenvillian orogenesis". GSA Bulletin . 131 (5–6): 913–940.
doi :
10.1130/B31944.1 .
ISSN
0016-7606 .
^
a
b Plumb, K. A. (June 1, 1991).
"New Precambrian time scale" . Episodes . 14 (2): 139–140.
doi :
10.18814/epiiugs/1991/v14i2/005 .
^
"Organic geochemical study of mineralization in the Keweenawan Nonesuch Formation at White Pine, Michigan" (PDF) . University of Michigan. Retrieved 28 September 2011 .
References