Aerial view of Black Mountains frontal fault zone
Perhaps the most dramatic evidence for recent faulting along the Black Mountains front is the sheer suddenness of the valley-mountain transition --and the linear nature of the fault. This photo also shows a wineglass canyon. The "wineglass" shape derives from the relatively open nature of the canyon at its upper reaches (the "bowl") and its narrow, steep mouth (the "stem"). Wineglass Canyons also indicate recent uplift because uplift at the canyon mouth keeps pace with erosion and maintains a steep gradient.
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