AS16-0982(M)

Figure 49

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An area centered about 900 km southeast of the Imbrium basin, illustrating again the radial fracturing and sculpturing of terra materials by the basin forming event. The arrow points to a 120 km long fracture that cuts the rims of the partly visible crater Albategnius in the lower left of the photograph and the crater Halley toward the upper left. It and similar trending fractures elsewhere in this picture are radial to the Imbrium basin and are related to its formation. The crater Hipparchus C (HC) is superposed on a fracture and, therefore, is younger than the Imbrium basin and the Imbrium sculpture. Light plains forming materials (LP) are  younger than the Imbrium event, as indicated by the absence of fractures and the scarcity of superposed craters. Light plains deposits are a major stratigraphic unit of the terra regions and will be illustrated in more detail beginning with  Figure 53 .   -M.W.