Measurements of net translation along the Neogene San Andreas transform boundary between Pacific and North American plates, as indicated by the global correlation of sea-floor magnetic anomalies and by total Neogene displacements along strands of the onshore San Andreas fault system, differ by hundreds of kilometres. The apparent motion discrepancy is reconciled for post–mid-Miocene time if both transrotational deformation along the coastal belt of California and basin-range extension east of the Sierra Nevada are taken into account.

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