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The Tidigisian (pron. /ʈdɪŋsɪn/; from Swedish tidig is, meaning "early ice") is the fourth and final geologic period in the Mesoarchean era. It went from around 2,940 Mya (million years ago) and lasted until 2,900 Mya.

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Mesoarchean
Hiroshiman Kärrmattian Sendaisian Tidigisian