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Most criteria used to substantiate the concept of continental drift rely on qualitative subjective interpretation and do not yield a statistically adequate proof that drift occurred across the North Atlantic Ocean. Specific variables could be used objectively to test the continental-drift model. Preferred variables are those that could establish (1) gradients parallel with a mobile belt (e.g., vectors defined by dissimilar rates of migration of fossil genera), (2) the intracratonic nature of the Caledonian and Appalachian mobile belts, and (3) the geometric separation of intersecting mobile belts.

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