A paleomagnetic study of a remagnetized Paleozoic terrane in the northern Sierra Nevada has provided new data on Cenozoic tectonics in the western United States. A combination of paleomagnetic and geologic evidence establishes that the remagnetization occurred during Late Jurassic time and that the rocks have experienced no major tectonic movement since. This conclusion establishes an eastern limit for the extent of large-scale tectonic rotations recently reported for Tertiary units on the western edge of the North American continent.

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