Tool Marks Made By Opportunity Rover or Something Else?

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Youtube User: whatsupinthesky37 - This was sent over to my by Doctor D yesterday and I spent most of the night searching the Opportunity Rover Microscopic Imager images looking for something similar.  I was not able to find one.  I think this has to be left by the rover, if not it is pretty awesome!  You tell me what it is!  Here is the link to NASA site! http://mars.jpl.nasa.gov/mer/gallery/all/1/m/3720/1M458433075EFFCEQKP2935M2M1.JPG

Another good link for information about the Arm and Tools: http://mars.jpl.nasa.gov/mer/technology/si_in_situ_instrumentation.html