Stenian Period (from Greek στενός (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
Boring Billion Riphean (stage)
^ "Organic geochemical study of mineralization in the Keweenawan Nonesuch Formation at White Pine, Michigan" (PDF). University of Michigan. Retrieved 28 September 2011.
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
v t e
Siderian Rhyacian Orosirian Statherian
Calymmian Ectasian Stenian
Tonian Cryogenian Ediacaran
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