Geologic period, 4533 to 3920 million years ago
| Pre-Nectarian |
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−4500 — – −4000 — – −3500 — – −3000 — – −2500 — – −2000 — – −1500 — – −1000 — – −500 — – 0 — | | Periods on the Lunar Geologic Timescale. Axis scale: Millions of years ago.
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| Celestial body | Earth's Moon |
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| Time scale(s) used | Lunar Geologic Timescale |
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| Chronological unit | Period |
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The pre-Nectarian period of the lunar geologic timescale runs from 4.533 billion years ago (the time of the initial formation of the Moon) to 3.920 billion years ago, when the Nectaris Basin was formed by a large impact. It is followed by the Nectarian period.