Attaching is the best word I can come up with because it cleary shows (to me at least) that in extreme ancient times martians had to do massive clean-up work to deal with the extreme hardship of cleaning up after their dead creatures died in a major calamity that ruined their atmosphere and destroyed the surface of their planet, causing them to go underground. Through the eyes of Curiosity Rover, there truly appears to be a diagram in "outside floor sculpture form", of segmented sections "attaching" to each other. So the dead creatures would be in one total section and not all over the place causing more disease than they already had.
The analysis I use for the photos and imagery are not mean't to be exacting, only to get you closer to understanding that there is intelligent life on mars (martians). Many of the rocks you may think are rocks, are in fact highly designed sculptures, mechanical objects etc.
Nasa is trying to leak out anomalous imagery with out of course talking about it public! Though most images have been doctored, Nasa is trying to humbly and quietly nudge us along with out going too public about it vocally. Though it is work and painstaking effort to find objects in the images that have not been altered in some way!