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.
Mare Tranquillitatis
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Mare Tranquillitatis is a lunar mare that sits within the Tranquillitatis basin on the Moon. It contains Tranquility Base, the first location on another celestial body to be visited by humans.
Imbrian
…created the huge Mare Imbrium basin occurred at the start of the epoch. The other large basins that dominate the lunar near side (such as Mare Crisium, Mare Tranquillitatis, Mare Serenitatis, and Mare Fecunditatis) were also formed in this period. These basins filled with basalt mostly during the subsequent Late Imbrian…
The Sea of Tranquility of the Moon
The Apollo 11 landing site at center, facing west, with the 22-kilometer-wide Maskelyne crater in right foreground
The Moon with Mare Tranquillitatis highlighted and the first crewed lunar landing marked
Three views of Mare Tranquillitatis, taken by the mapping camera of the 1972 Apollo 17 mission