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It definitely doesn't look natural. With all of the pictures we see. I for one am convinced that there is more on Mars than we are led to believe.
NASA says the straight edges may be the result of fractures, related to fractures or a hill that was lifted up by the faulting and its current shape was the result of the surrounding terrain having been eroded down over billions of years.
This actually looks like what we here in the Ozarks call a "mill race". Google it for examples or remain ignorant of basic geology.
reply to post by ikonoklast
Perspective changed it a bit. Now I see a remnant of a perfect sphere which may slowly hit the surface pushing material in front of it. Probably impossible but in some special trajectory...who knows.