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The Eratosthenian period in the lunar geologic timescale runs from 3,200 million years ago to 1,100 million years ago. It is named after the crater Eratosthenesmarker, whose formation marks the beginning of this period. The formation of the crater Copernicusmarker marks its end, and the beginning of the subsequent Copernician Period. The massive basaltic volcanism of the Imbrian period tapered off and ceased during this long span of lunar time. The youngest lunar lava flows identified from orbital images are tentatively placed near the end of this period.

Its Earth equivalent consists of most of the Neoarchean era (Archean eon), Paleoproterozoic and Mesoproterozoic eras (Proterozoic eon).


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