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.
http://www.ultor.org/like%20cydonia/fha1450b.jpg.htm
http://www.ultor.org/like%20cydonia/m0202002.jpg.htm
Perhaps a similar texture but smaller:
http://www.ultor.org/like%20cydonia/m0402289.jpg.htm
A more extreme example, with a similar edge but more hollow inside:
http://www.ultor.org/like%20cydonia/m0903566.jpg.htm
http://www.ultor.org/like%20cydonia/m1003305f.jpg.htm
http://www.ultor.org/like%20cydonia/m1400773b.jpg.htm
http://www.ultor.org/like%20cydonia/m1801417b.jpg.htm
A similar exterior but more flat on the top:
http://www.ultor.org/like%20cydonia/m1901441.jpg.htm
Possibly also a collapse. It looks like a crater, but with the ring like extra width on the crater rim at the top.