1. Education

Your suggestion is on its way!

An email with a link to:

http://geology.about.com/library/bl/images/blthrustfault.htm

was emailed to:

Thanks for sharing About.com with others!

Most Emailed Articles

Now We Can Begin

Thrust Fault


Photo by Marli Miller, University of Oregon. Used by permission. (fair use policy)

The Keystone thrust near Las Vegas, Nevada, is a spectacular example of a thrust fault, a reverse fault with shallow dip. The dark-gray Cambrian limestone of the Bonanza King Formation is moved sideways and above the pink Aztec Sandstone, of Jurassic age. This area is preserved in the Red Rock Canyon National Conservation Area. In 1998 Clark Burchfiel argued, after detailed mapping of this area, that the Keystone fault is actually farther to the left and that this is the Wilson Cliffs thrust fault. But it is spectacular by any name.

The thrust fault was most active about 70 million years ago, during the long Sevier orogeny (mountain-building episode). Compressive forces caused by tectonic plate interactions to the west pushed the upper crust eastward. Movement on this thrust fault, which is part of the extensive Sevier fold-thrust belt, appears to have been nearly 100 kilometers.

Fossils
Geologic Features and Processes
Glaciers and Ice
Landforms
Minerals
Rocks
Geology and Society

Subscribe to the Newsletter
Name
Email

©2014 About.com. All rights reserved.