The Letter C Or Oval Shape Carved In Mars Rock?

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Youtube User: whatsupinthesky37 - Thank you to Spacecase (Brian) for sending this picture on over to me!  The first thing that caught my eye was that letter C on the bigger rock.   It looks to perfect to have just randomly showed up there out of nowhere.  Are we cutting into these rocks with the on board laser or has this been carved into the rock?  Let us all know what you think!  As always here is the link to the picture!  http://mars.jpl.nasa.gov/msl-raw-images/msss/00618/mcam/0618MR0026010620401331E01_DXXX.jpg