A fault line is the trace pattern of a planar fracture or discontinuity in a volume of rock. Hmm, that's nice. In this case, the Valley Fault Line is a highly functional freeride board that has a platform (a footwall in geological terms) that has been dropped below the hanging wall (oops, another geo term). This gives you a great place to lock in your feet, as well as allowing for more controlled drifts and slides. Skate nerd approved!