Imbrian
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The Imbrian is a lunar geologic period divided into two epochs, the Early and Late.
Lunar olivine basalt formed around 3.3 billion years ago. This is part of sample 15555, known as Great Scott.
Lunar geologic timescale
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The lunar geologic timescale divides the history of Earth's Moon into five generally recognized periods: the Copernican, Eratosthenian, Imbrian, Nectarian, and Pre-Nectarian. The boundaries of this ti
Imbrian
…The Imbrian is a lunar geologic period divided into two epochs, the Early and Late. In the lunar geologic timescale, the Early Imbrian epoch occurred from 3,850 million years ago to about 3,800 million years ago. It overlaps the end of the Late Heavy Bombardment of…
Ancient rift valleys – closeup (artist's concept)
Full Moon 2010