Kilty's main objection to raising the Colorado Plateau via crustal flow is what he might call the failure of a crucial test: verifying the predicted implications of the model for the upper crust. We welcome the opportunity to defend the necessity of the tests we proposed and also to explain how the “crucial test” that Kilty proposes strengthens, rather than weakens, our model of Colorado Plateau uplift.

The first hurdle for crustal thickening mechanisms for the uplift of the Colorado Plateau is viability. We evaluated the viability of plateau uplift by intracrustal flow by first seeing if it is possible...

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