The earth analog for that one
It reminds me of some relatively coarse grained conglomerate type rock I think I rememebr from the Texas Hill country. It also reminds me of a sedimentary with eroded pebbles in the matrix.
That is NOT to suggest these are sedimentary or conglomerate pictures, or that Mars has limestones It is just an interesting similarity.
Thanks for posting that pic, Buck Galaxy.
Ed