Moon: Korolev and Hertzsprung 00NS 145W

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
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Scale: 1 pixel = 2 km. 5-degree grid;            
Mercator Projection, Projection Center 00NS 145WE; Map center 00NS 145W

       Lunar Geology Index     Global and Planetary Geology Index

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Copernican: Beginning with the formation of the bright crater Copernicus, about 1.1 Ga. Formation of bright ray craters.
Eratosthenian: Begins with the formation of the crater Eratosthenes. Fresh but non-rayed craters and late mare eruptions. 1.1 to 3.1 Ga.
Imbrian: Begins with the formation of the Imbrium Basin. Includes most mare eruptions. 3.1 to 3.8 Ga.
Nectarian: Begins with the formation of the Nectaris Basin, and includes most of the major impact basin events. 3.8 to 3.9 Ga.
pre-Nectarian: Before 3.9 Ga


Korolev (named for Sergei Korlolev, mastermind of the Soviet space program) and Hertzsprung (named for Ejnar Hertzsprung, Danish astronomer and co-inventer of the Hertzsprung Russell Diagram, a fundamental tool for investigating stellar evolution) are plenty big enough to be sizable maria, but are completely lacking in mare lavas. Korolev is recognizable on the geologic map but Hertzsprung is entirely invisible. It's morphologically evident but mantled by Mare Orientale and other younger deposits.

Notes and References

Lunar Geology Index
Global and Planetary Geology Index
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Created 11 April 2014, Last Update 12 March 2015
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