The Stenian (from Greek stenos, "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.
This period includes the Keweenawan Age at about 1100 Mya.
|Preceded by Archean Eon||2.5 Ga - Proterozoic Eon - 542 Ma||Followed by Phanerozoic Eon|
|2.5 Ga - Paleoproterozoic Era -1.6 Ga||1.6 Ga - Mesoproterozoic Era -1.0 Ga||1.0 Ga - Neoproterozoic Era -542 Ma|
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