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3920 – 3850 Ma
Usage information
Celestial bodyEarth's Moon
Time scale(s) usedLunar geologic timescale
Chronological unitPeriod

The Nectarian Period of the lunar geologic timescale runs from 3920 million years ago to 3850 million years ago. It is the period during which the Nectaris Basin and other major basins were formed by large impact events. Ejecta from Nectaris form the upper part of the densely cratered terrain found in lunar highlands.

Early ImbrianLate ImbrianPre-NectarianNectarianEratosthenianCopernican period
Millions of years before present

Relationship to Earth's geologic time scale[edit]

Since little or no geological evidence on Earth exists from the time spanned by the Nectarian period of the Moon, the Nectarian has been used by at least one notable scientific work[1] as an unofficial subdivision of the terrestrial Hadean eon.

See also[edit]


  1. ^ W. Harland; R. Armstrong; A. Cox; L. Craig; A. Smith; D. Smith (1990). A Geologic time scale 1989. Cambridge University Press.