Mascons - A two-body solution
It is demonstrated that the mascon gravity anomalies are not produced simply by the occurrence of a superisostatic fill in mare basins. The fill alone is too thin to account for the large positive anomalies observed. The mascon anomaly can be explained if it is assumed that the mass excess occurs in two bodies rather than in a single body. The structure model discussed accounts for the gravity field so far observed at several heights over the central part of Mare Serenitatis.
Bowin, C.↗