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The Copernican Period in the lunar geologic timescale runs from approximately 1.1 billion years ago to the present day. The base of the Copernican period is defined by impact craters that possess bright optically immature ray systems. The crater Copernicus is a prominent example of rayed crater, but it does not mark the base of the Copernican period.
Copernican age deposits are mostly represented by crater ejecta, but a small area of mare basalt has covered part of some of the rays of the Copernican crater Lichtenberg, and therefore the basalt is mapped as Copernican age.
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