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Along with fellow Lockheed engineer Daniel Lyddy, [physicist Ron] Levin used images from the Jet Propulsion Laboratory's website. The resulting stereoscopic reconstructions, made from paired images from the Opportunity rover's twin cameras, show bluish features that look perfectly flat. The surfaces are so smooth that the computer could not find any surface details within those areas to match up between the two images.
The imaging shows that the areas occupy the lowest parts of the terrain. They also appear transparent: some features, which Levin says may be submerged rocks or pebbles, can be seen below the plane of the smooth surface.
Update: It looks like Ron Levin didn't do his homework on this. Follow the link Peter Erwin provides in the comments. Short version: the image that Levin processed for his research turns out, when examined in context, to be part of a tilted cliff face, not a horizontal surface -- not a good spot for still water.