Well, folks. . . you can all go home now, it's just the light, angle, and strangely shaped wind blown rocks there. You see, Half-n-Half san had it right; before the meteor storm that destroyed the atmosphere--or reconditioned it, would be a better way to put it--even, we didn't have humanoid forms, really. Way back then, we were more of a soft shelled 'nebulous' form...not with a solid bone structure. And, of course, we were much smaller than the size of those rocks there.
Now if you were to look at some of the nanobe (microbe) shapes that can be found on earth, you might get a little better of an idea of the lengths those left had to adapt into--for example a formaminitera. So it was easy for us to adapt into the human form too, (I don't mean take the form of) but we are still there...in the head...we just took over the then present life forms that were here at the time. So those of us who came here, are still here...but not every human is acting as a host.
But you are also right in a way, Uncle Frank, I have heard of stories about the occasional angered 'female?' (if we can use that term) pushing into her partner. What happened in such cases is that the 'female' absorbs the partner--which actually was simply another element of reproductive strategy; a reverse element. I'm quite certain that that element was mishievously recorded by Martian influence in the concept of two beings' marrying, becoming one flesh.
It is a nice photo, though I'm not familar with that area, however. Thanks for sharing my dear Martian sister !