Scale: 1 pixel = 2 km. 5-degree grid; Lambert Conformal Conic Projection, Center 50N 015W
|Copernican: Beginning with the formation of the
bright crater Copernicus, about 1.1 Ga. Formation of bright ray
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
Mare Frigoris (Sea of Cold) is unusual among lunar maria for its elongate shape. We now recognize that it actually fills one of the outer rings of the Imbrium Basin. The tongue of high ground between Mare Imbrium and Mare Frigoris host the flooded crater Plato and the graceful Sinus Iridium (Bay of Rainbows), whose northern rim is intact but whose southern rim is buried by Imbrium mare deposits.
Created 11 April 2014, Last Update
12 March 2015
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