Encountering a Surprise

While preparing to start robotic arm work on the target "Cape Elizabeth" on Sol 3541 (Jan. 8, 2014), Opportunity encountered a slight surprise -- a rock had appeared in the images that had not been there before.

Link - http://mars.nasa.gov/news/whatsnew/index.cfm?FuseAction=ShowNews&NewsID=1585

Rock like a ‘jelly doughnut’ has left scientists ‘completely confused’
http://www.independent.co.uk/news/science/nasa-says-mars-mystery-rock-that-appeared-from-nowhere-is-like-nothing-weve-ever-seen-before-9070323.html
http://www.weather.com/news/science/space/mysterious-mars-rock-20140116

http://marsrover.nasa.gov/gallery/all/1/p/3540/1P442453196EFFCAEFP2594L2M1.JPG

Mars Rover Heads Uphill After Solving 'Doughnut' Riddle
February 14, 2014


http://www.nasa.gov/sites/default/files/styles/673xvariable_height/public/pia17942.jpg?itok=L1hllcby

Researchers have determined the now-infamous Martian rock resembling a jelly doughnut, dubbed Pinnacle Island, is a piece of a larger rock broken and moved by the wheel of NASA's Mars Exploration Rover Opportunity in early January.

Link - http://www.nasa.gov/jpl/mer/mer20140214/index.html#.Uv-yn7TIeKG