Anderson does not challenge the principal conclusion of our paper, that three faults in northwestern Arizona combine to form a regional, low-angle normal fault, and that the observed north to south, plastic to brittle progression of footwall fault rocks reflects decreasing exhumation of footwall rocks due to decreased fault displacement to the south. Anderson's principal points center on perceived inconsistencies in our spatial and temporal portrayal of faulting and tilting along the Salt Spring fault. In addition, he proposes two models for the extension in the White Hills, the rolling-hinge model, which he rejects, and a footwall diapir model, which...

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