AS15-9287(P)

Figure 117

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Remarkable detail is shown in this enlargement of a small part of a panoramic camera frame. In most respects, the crater itself is typical of a great many craters its size-about 1.2 km. Because it does not have rays, it is believed to be older than most other craters discussed previously in this chapter. Its rounded rim crest and slightly raised rim (extending outward to the arrow on the west side) also point to its greater age. On the other hand, it is young enough that some of the original dunelike texture of the ejecta blanket is preserved (especially to the west), a great many large blocks of ejecta are still visible, and the original depth of the crater has not been greatly lessened by infalling debris. The largest blocks, which are about 30 m in size, occur near the rim. The terrace (T) extending partly around the wall about 100 m below the surface probably marks the top of a resistant rock layer. However, if there were other signs of bedrock stratification within this crater, they have been obscured by the movement of debris down the walls. The very smooth floor is the only unusual feature of this crater. It may consist of a solidified pool of rock melted by heat generated from the impact.   -H.J.M.