Unusual paper-thin erosion of a rock seen by Curiosity, sol 601
Here is the original photo. The version above has been cropped and then slightly blurred and downsampled in order to reduce the very strong JPEG compression artifacts in the original photo. It ought to be replaced with a better version once the data are released to the PDS.
This image is in the public domain. Original image data dated on or about April 15, 2014