If you take a look to the bottom of the left crevice in Nasa Curiosity-Image, linked on http://mars.jpl.nasa.gov/msl-raw-images/msss/01429/mcam/1429MR0070680070702588E01_DXXX.jpg
maybe you recognize a kind of skull with - in my eyes - clear structure of a denture rsp. teeth....
I have enhanced the original image a little bit by brightening it a little bit.
What do you guys out there think about
I´d like to know.