This way the skeleton head eye sockets could hold up the creatures for strength support for walls! It must of been the larger creatures were used more for walls I would think !
Even if eventually everything turns to dust, it would be mandatory to make containers as soon as possible. So no disease or bacteria would spread! Also the stench form the billions of dead creatures would of been unbearable. That in itself would be worthy of a monumental memorial dedicated to the martians work in extreme antiquity. That had to be clean-up work that we as earthlings could not comprehend because we never experienced such a task!
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!