AS16-1411(M)

Figure 48

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A basin forming event severely affects the terrain even beyond the outer margins of its ejecta deposits. This system of ridges and grooves known as Imbrium sculpture is radial to the Imbrium basin,  located beyond the upper left horizon about 650 km from the center of this scene. The crater Herschel, 40 km in diameter, is at the center of the right edge. It is perched on the grooved rim of  Ptolemaeus, part of whose floor and rim is visible in the lower right corner. Both secondary impact and faulting have been proposed as causes of the ridges and grooves, but in any case the sculpture must have been produced by the same event that produced the Imbrium basin.  -D.E.W.