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Imbrian


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1 A period of the Archaean, dated at about 3850–3800 Ma (Harland et al., 1989). The name is no longer used.

2 Two epochs in the lunar time-scale, the Lower Imbrian (3850–3800 Ma ago) and the Upper Imbrian (3800–3200 Ma ago).

Subjects: Earth Sciences and Geography.


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