Third and last period of the Mesoproterozoic Era
Stenian 1200 – 1000Ma Chronology −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]
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 Lower GSSA ratified 1990[ 4] Upper boundary definition Defined chronometrically Upper GSSA ratified 1990[ 4]
TheStenian Period (/ˈ s t iː n i . ə n STEE -nee-ənAncient Greek :στενός ,romanized : stenós geologic period in theMesoproterozoic Era and lasted from 1200Mya to 1000 Mya (million years ago). Instead of being based onstratigraphy , these dates are definedchronometrically . The name derives from narrowpolymetamorphic belts formed over this period. It is preceded by theEctasian Period and followed by theNeoproterozoic era and theTonian period.
Thesupercontinent Rodinia assembled during the Stenian. It would last into the Tonian period before breaking up in theCryogenian .
This period includes the formation of theKeweenawan Rift at about 1100 Mya.[ 5]
Fossils of the oldest known sexually reproducing organism,Bangiomorpha pubescens [ 1]
Boring Billion – Earth history, 1.8 to 0.8 billion years agoRiphean (stage) – Stage in the geological timescale named after the UralsPages displaying short descriptions of redirect targets ^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. (February 2018)."Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis" Geology .46 (2):135– 138.doi :10.1130/G39829.1 .eISSN 1943-2682 .ISSN 0091-7613 . ^ 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". In Tollo, Richard P.; Bartholomew, Mervin J.; Hibbard, James P.; Karabinos, Paul M. (eds.).From Rodinia to Pangea: The Lithotectonic Record of the Appalachian Region .doi :10.1130/2010.1206(02) .ISBN 978-0-8137-1206-2 LCCN 2010003691 . ^ Swanson-Hysell, Nicholas L.; Ramezani, Jahandar; Fairchild, Luke M.; Rose, Ian R. (May 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 .eISSN 1943-2674 .ISSN 0016-7606 . ^a b Plumb, Kenneth A. (June 1991)."New Precambrian time scale" .Episodes 14 (2):139– 140.doi :10.18814/epiiugs/1991/v14i2/005 eISSN 2586-1298 .ISSN 0705-3797 .LCCN 78646808 .OCLC 4130038 . ^ "Organic geochemical study of mineralization in the Keweenawan Nonesuch Formation at White Pine, Michigan" (PDF) . University of Michigan. Retrieved28 September 2011 .
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