This first clip from this MGS image (51305c) shows some structures apparently not natural and obviously not imaging artifacts...

This second clip (appearing as the colorized negative) shows a strange regular structure that may either be an artificial square recess or a pyramid, which would be an interesting thing to find at the front of an undulating "serpent mound" like feature such as the suggestion of can be found here.

This larger version helps point out that these wouldn't be the only strange and artificial things about the contents of this image. The shapes in the upper right quarter seem particularly odd.

Finally, another view of the "pyramid" area... still rather undeterminable, and yet, here we see the suggestions of the possibility of an impressive number of pyramidal forms (coloed in soft blue-green), along with some face forms and more very interesting things.