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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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