Craig – I think Bill Leatherbarrow is the man for this. However, it is not the only summit “crater” on a central peak. I suspect that it is a collapse feature – a dimple – rather than an impact crater. That said, it does have a small impact crater within it! Have a look at this: https://commons.wikimedia.org/wiki/File:AlbategniusCraterPeak.jpg – Ray E. –
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