Paleozoic and Mesozoic arc-related rocks of the Black Rock Desert region of northwestern Nevada have acquired a very stable postfolding secondary magnetization, probably in Late Cretaceous time. The remagnetization, which appears to be of regional extent, probably accompanied emplacement of granitic plutons in a northeast-trending belt across northwestern Nevada near the end of Mesozoic time. The region has experienced no appreciable tectonic rotation since that time.

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