Lute Ridge, Anza Borrego Desert State Park

Lute Ridge is an uplifted block of alluvium thrust upward as a result of motion on the Clark Fault, one of many faults associated with the San Jacinto Fault zone. The photo was taken at the top of the fault scarp, some 100 feet high. The scarp is about 2 miles in length. The San Jacinto fault, a right-latreal fault, trends northwestward to the top of the photo. The block to the immediate right has dropped down and the mountains farther to the right in the photo moving southeastward. Clark Dry Lake is in the distance.

"Lute Ridge is a classic fault scarp and the largest known of its kind on the North American continent, developed in recent unconsolidated sediments." (Lute Ridge, Anza-Borrego Desert State Park, The Canyoneers, San Diego Reader, May 8, 2013;