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Lunar geologic timescale

The lunar geologic timescale divides the history of Earth's Moon into six generally recognized geologic periods:

Copernician[?] Period : -1100 MY to present
Eratosthenian[?] Period : -3200 MY to -1100 MY
Upper Imbrian[?] Epoch : -3800 MY to -3200 MY
Lower Imbrian[?] Epoch : -3850 MY to -3800 MY
Nectarian[?] Epoch : -3920 MY to -3850 MY
Pre-Nectarian[?] Epoch: -4550 MY to -3920 MY

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