AS17-2334(P)

Figure 241

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This crater (approximately 9 km across) is on the juncture between two basalt units at the south border of Mare Serenitatis. The unit south of the dashed line forms a conspicuous dark border around the mare and slopes northward toward the center of the Serenitatis basin. The adjacent mare unit is lighter in color, generally flat, and embays the older dark unit. The straight rille grazing the crater is one of several concentric grabens in the dark border material and probably formed by extension as the lava sagged toward the basin center prior to emplacement of the central mare. The crater is largely filled by the younger mare unit; because the graben transects the crater rim and its trend is influenced by the crater, the graben is probably younger.    C.A.H.