Mare Serenitatis is a circular mare approximately 600 km in diameter in the northeast quadrant of the lunar near side. It occupies an old multi-ringed basin (refs. 33-1 and 33-2) and is the site of a prominent mascon (ref. 33-3). A conspicuous dark annulus in this mare prompted subdivision of the mare materials into different stratigraphic units (refs. 33-2 and 33-4). A revised stratigraphic sequence for the southern part of Mare Serenitatis, based on photogeologic interpretation of Apollo 15 and 17 photographs, is summarized as follows after Howard et al.
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Remote sensing and photogrammetric studies: Part A: remote sensing of Mare Serenitatis