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Stenian

1200 – 1000 Ma

Pha.

Proterozoic

Archean

Had.

Paleoglobe of Earth during the late Stenian, c. 1040 Ma^{[citation needed]}

Chronology

−1200 —

–

−1180 —

–

−1160 —

–

−1140 —

–

−1120 —

–

−1100 —

–

−1080 —

–

−1060 —

–

−1040 —

–

−1020 —

–

−1000 —

–

M
e
s
o
p
r
o
t
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r
o
z
o
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c

N
♇

Ectasian

Stenian

Tonian

←

First appearance of Bangiomorpha pubescens^[1]

←

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.

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

1991^[4]

Upper boundary definition

Defined chronometrically

Upper GSSA ratified

1991^[4]

The Stenian Period (/ˈstiːni.ən/ 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]

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Transcription

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

"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.

Proterozoic Eon

Paleoproterozoic Era	Mesoproterozoic Era	Neoproterozoic Era
Siderian Rhyacian Orosirian Statherian	Calymmian Ectasian Stenian	Tonian Cryogenian Ediacaran

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This page was last edited on 14 June 2024, at 14:37