Stenian

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The Stenian is the last geological period in the Mesoproterozoic that began 1.2 billion years ago, and ended at 1 billion years ago. Before it was the Ectasian It is followed by the Tonian.

The supercontinent Rodinia began forming in this period.

This period includes the Keweenawan Age at about 1100 mya.[1]

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