Tuesday, September 15, 2015

S.O.B. Hill and Devil's Lane, Needles District, Canyonlands National Park, Utah

SOB Hill and Devil's Lane 

SOB Hill and Devil's Lane by Mark Betts

The relay ramp faults are transferring throw or movement from the high angle normal faults that form either side of the graben. When two large relay ramps merge such as here at SOB hill, the throws can visibly offset the graben. View is from the south looking north.

The predominant N-S fractures are from westerly extension. All of this sandstone is riding on the underlying Paradox Salt. The Colorado River has finally cut down into the salt layer. The salt dissolves and erodes rapidly and allows the overlying sandstone to crash down into the river. This allows even more westward movement as material sloughs into the river canyon. These faults and associated grabens are very young and are a great example of modern geology that is happening now and easy to see.

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