This is actually a pretty wide lens - he/she is most likely standing not far out of shot of the base of this image.

The top line in this example is where the horizon SHOULD be if it was a longer lens - it's would be VERY compresses and almost image distortion at all.

The lower line is where the horizon actually BENDS downward. This isn't bad as the camera was properly levelled, but it DOES curve downward (lens distortion/curves straight lines) is a dead giveaway of wide angle lenses.

That is the only real giveaway as everything else in this shot is organic and can be shaped in any number of ways. But I would wager that the front face of the rock formation on the right is straight and vertical and not slightly angled forward (which is you vertical line giveaway).

Hope that helps. This looks like something one of the Meunch guys (David and Marc) would have taken - www.muenchphotography.com - their images are amazing!

-Lew ;-)