Slides 13–17 show craters of similar size (25–27 km in diameter) in various stages of degradation. The amount of detail seen in the crater rim, interior, and ejecta blanket is a good indication of relative crater age.

16. Degraded Crater

This crater (25-km diameter) has undergone extensive degradation. No ejecta blanket or interior structure remains and much of the crater rim has been obliterated. The degraded rim and infilled bowl create the shallow appearance of the crater.

46.26° N, 62.99° W; Viking Orbiter frame 704B35

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