The most significant geologic trait of Red Rock Canyon National Conservation Area is the Keystone Thrust Fault, developing 65 million years ago. It was formed when a break in the earth's crust drove the gray, ancient limestone rock of the crustal plate over the top of the younger, red and tan sandstone bluffs of another plate. Extending for 13 miles along the Red Rock escarpment, the Keystone Thrust Fault is one of the most dramatic and easily identified thrust faults in the world. Here the LaMadre limestone cliffs rise behind the vibrant colors of Bridge Mountain.
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