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Keweenawan Age : ウィキペディア英語版 | Stenian The Stenian (from Greek ''stenos'', "narrow") is the final geologic period in the Mesoproterozoic Era and lasted from Mya to 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. The supercontinent Rodinia assembled during the Stenian. This period includes the Keweenawan Age at about 1100 Mya.〔(【引用サイトリンク】title=Organic geochemical study of mineralization in the Keweenawan Nonesuch Formation at White Pine, Michigan )〕 ==Notes==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Stenian」の詳細全文を読む
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