Thursday, September 10, 2009

Entrance to Arches National Park...


looking north, showing US 191 and the Visitor's Center, from the Moab Fault Overlook (click to enlarge.)

The trace of the Moab fault can be seen above and to the left of the Visitor's Center, manifest by the extremely fractured and rubbly sandstone just above road level. The prominent escarpment to the left (west) of the fault is the Wingate Sandstone, while the red beds on the right side (east) belong to the Slick Rock Member of the Entrada Sandstone. Given the offset in the stratigraphy, the vertical throw on this fault is determined to be ~ 2,600 ft. Note that there is a parallel normal fault located towards the right side of the image.

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