Cather's (1999) paper concerning the amount of Laramide right slip along northerly trending faults on the east side of the Colorado Plateau in northern New Mexico contains two major flaws and several minor ones that cause his estimate of a minimum of ∼85 km of right slip to be highly questionable. A major problem concerns his failure to recognize that vertical surfaces as well as linear features can be used to determine lateral separation along major strike-slip faults. Also, his assumption that Phanerozoic pre-Laramide strike-slip motion on these faults was necessarily sinistral (Cather, 1999, p. 849) is not...

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