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My main reasons for publishing this were the face like edgings, part of a series of photos I was developing. Also the squarish shape. The impression is of some stronger edgings, like concrete holding in a more loose material in the center. Here are some related features:

Edging that apparently has worn away to expose a different material underneath.

Perhaps a similar texture but smaller:

A more extreme example, with a similar edge but more hollow inside:

A similar exterior but more flat on the top:


Possibly also a collapse. It looks like a crater, but with the ring like extra width on the crater rim at the top.