Click photos to enlarge.
This fault can be easily accessed from Highway 50 less than 1 mile east of Keystone Junction (the turnoff to the small town of Ruth) and about 6 miles west of Ely, Nevada. Just park on the northeast side of the highway at Milepost 62 and look up (or walk up). The fault is a low-angle fault, striking about NS and dipping 30 degrees to the east, with N70E slickensides. The fault surface appears to be undulating in its overall geometry. It has Ely Limestone in the hanging wall, and possibly has Ely Limestone in the footwall - although the thin-bedded, cherty limestone in the footwall could conceivably be a different formation. As far as I know, this fault is not mapped on any major maps; I'm not sure about any thesis maps done in the area.
The first photo shows the general setting of the fault, looking to the northeast. The second photo shows a closeup of the fault, looking southward.
As seen in the third photo, the fault often has folds in the footwall. It was a little difficult to get any measurements on fold axes due to the steep nature of the cliffs. One that I did measure trended about N60W, with overturned beds dipping steeply to the northeast on the northeast limb, and beds apparently dipping rather shallowly southward on the southwest limb of the fold - but that part of the fold didn't outcrop well, and I may have been measuring the regional strike and dip of beds and not anything related to the fold itself.
Also, there may be other faults in the hanging wall, and hints of these possible structures can be seen in photos 1 and 3.
A major fault is exposed at the base of the cliff in a few places, below the fault described above. That fault shows up on local and regional maps as a thrust fault, and may be of greater offset than the one I've shown pictures of above. (The amount of offset has not been documented on either fault, as far as I know.) Exposures of that lower fault are harder to reach at the base of the limestone cliffs, and are most visible above steep, roadcut faces that can't be climbed. Standing above these steep faces requires nerves of steel. The intrusive rock that forms the footwall of the lower fault can be seen most easily by walking carefully along the highway to the north of the fault exposure seen above in photo one (that is, just off the left side of photo one).
One question I have: can the folds below the fault, as shown above, form by extension, or are they more likely to have formed by compression?
View Larger Map