Encyclopedia > Lunar geologic timescale

Article Content

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

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

Urethra

... scrotum. Infection of the urethra is urethritis, said to be more common in females than males. Urethritis is a common cause of dysuria[?] (pain when urinating). ...