Horton Reply 256:That's a beauty!...

Horton
Reply 256:
That's a beauty! Look at the center rock with the soil walls welling up around it.

That's what you get when you toss a rock into a coherent muddy material or a dry fine coherent material.

It's also the kind of pattern formed by a rock sitting in a saturated frozen mud that experiences cyclic freeze-thaw cycles.

It looks more like a freeze-thaw sedimentary record to me.
I believe that the same process on Earth occurs in frost wedging/heaving. This is a process where freeze-thaw cycles cause rocks to be pushed up to the surface through surrounding soil by the surrounding soil. This rock was probably either pushed up to the surface by this process OR it has been on the surface for sometime and the soil below is the right consistancy where it is trying to push up the rock but the rock can't be pushed up any further.

Or could the rock have been displaced by the thrusters....

Does anyone know what the scale of the center rock is?