swiss-cheese rocks on Mars

The Spirit rover image

http://marsrovers.jpl.nasa.gov/galle...IP2552L2M1.JPG

shows rocks that are riddled with holes, many of which
appear to be occupied (!) by features that are too small
to see clearly. Perhaps they are similar to the wormlike
features seen in the "popcorn" pebbles by Opportunity,
for example, as seen he

http://morris.best.vwh.net/ftp/six.jpg

Paul

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