I know you will not like this, however it has to be said and the sooner you start believing it, the better.
In my, and many people's opinion, the level of enlargement in these pictures (after the first one) is far too great to show any 'structures'. What is shown is the compression within the image. Q
Attached is an enhanced version of one of the first highres Curiosity pics released and it can take quite a bit more zoom than the original. Further attachments are enhancements of an area on the far side of the desert. The area, although quite a distance, was choosen for its larger buildings, yet the entire strip can be also be clarified in like manner. The final submission is of one of the main buildings and details of its surroundings. This is at the far end of enhancement yet not the limit by any means. It was done at about 1100% but this can still produce acceptable results to approximately 2300%. The viewer is encouraged to try the attached ( main ) pic and see what they may accomplish at their work and in their findings.