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HUNTINGTON AND GOLDTHWAIT: THE HURRICANE FAULT. 255 
against the red sandstone walls, forming bridges under which the trail 
winds upward along the rough valley floor. Yet, in spite of the depth 
and impressiveness of the canyons, erosion has accomplished but little 
since the last upheaval, even although it almost seems that the young 
canyons are visibly sawing back into the massive stump of the plateau. 
Their rapid work gives promise of the day when, if erosion continues 
unchecked, the mature topography must be entirely consumed, and a 
rugged, inhospitable region will succeed the attractive pasture of the 
upland of to-day. But that will by no means be the end ; for, if the 
present cycle is allowed to run its course unhindered, a gentler maturity 
and a subdued old age are still in store for this desert corner and for all 
the great Southwest. 
