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Paleomagnetic data for nearly all geologic periods are now available from North America and Europe. The more reliable Paleozoic and Mesozoic evi-dence is analyzed in terms of some North Atlantic paleogeographic models, but the usefulness of paleomagnetism in testing such reconstructions is not obvious and depends critically upon the geometry of continental drift.

The divergence of the North American and European apparent polar-wandering curves is systematic only over their Carboniferous, Permian, and Triassic parts. The data are simultaneously compatible with two major rota-tions since the Permian: (1) separation of the two continents initially about the polar pivot proposed by...

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