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Fraser
2010-Nov-19, 07:50 PM
The HiRISE camera on the Mars Reconnaissance Orbiter took an image of a thin channel, and a portion of it contains a naturally occurring bridge over the chasm. Kelly Kolb from the HiRISE team says it is probably a remnant of the original surface, the rest of which has collapsed downward. It isnít likely thereís [...]

More... (http://www.universetoday.com/79545/rock-bridge-on-mars/)

timcole
2010-Nov-20, 10:44 AM
Why doesn't the surface of the bridge conform to the texture and pattern of the surrounding surface? Did some anomalous wind compact surface dust into a bridge over the chasm?

BigDon
2010-Nov-20, 08:05 PM
I'd guess wind differences. The bridge would act like a wing of an airplane, like a lot of real bridges do.