Understanding the magnitude and timing of strike-slip movement on the eastern margin of the Colorado Plateau has been a persistent problem since Kelley (1955) first noted evidence for Laramide dextral slip on the Nacimiento fault. The difficulty of estimating strike-slip components of fault systems is emphasized by the historical debate on slip magnitude in the San Andreas system, which is now thought to be about 320 km (Graham et al., 1989). In short, our reply to Woodward's Discussion is: (1) isopach contours drawn from incomplete and widely separated stratigraphic data are ambiguous and do not provide robust piercing...

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