I'm told it's the impression made by the Mossbauer spectrometer. Apparently the spectrometer needs to press up against the soil to work.
Here's an animated gif showing the formation of the semi-circle from Opportunity using before and after pics: http://marsrovers.jpl.nasa.gov/gallery/press/opportunity/20040206a/moss_touch_movie_br.gif or http://tinylink.com/?8ps7Jnna3u > Almost looks like an artifact. > > > http://tinyurl.com/3fy8f > > > On the microscopic imager > > http://tinyurl.com/3435r > > xponent > Weirdness Abounds Maru > rob > > > _______________________________________________ > http://www.mccmedia.com/mailman/listinfo/brin-l > _______________________________________________ http://www.mccmedia.com/mailman/listinfo/brin-l
