http://www.lyle.org/~markoff/process...6L234567M1.JPG
Opportunity, Sol 103, Pancam.

I don't. But it sure looks like one. Could the wind do something like that?

The obliquity of Mars is believed to have changed periodically on a
relatively short timescale (millions of years). Snow pack layering could
have melted, creating such channels/gullies.

cheers,

Michael
Mars Fossils, Pseudofossils and Problematica
http://aix1.uottawa.ca/~weinberg/mars
Proterozoic Earth bacteria contaminates Mars...
rodrian