Christie-Blick and Anders highlight worthwhile aspects of the debate over the magnitude of Cenozoic crustal extension associated with the Sevier Desert detachment of central Utah. We welcome this opportunity to expand the necessarily limited treatment of the Sevier Desert detachment in DeCelles and Coogan (2006) with an evaluation of the most recent components of the “mounting evidence” cited by Christie-Blick and Anders that the Sevier Desert detachment does not exist. For brevity, we limited our objections in DeCelles and Coogan (2006) to the principal geologically based unconformity interpretations for the lower boundary of the Cenozoic Sevier Desert basin espoused by...
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