Samples from mud flats of the upper bare zone of San Francisco Bay, California, tidal flats possess remanent magnetization uniform in intensity and direction. The uniformity of magnetization and considerations of the stability of iron species in low Eh, low pS-- environments (reducing marine conditions) indicate that the remanent magnetization is not chemical remanent magnetization.

The pervasiveness of bioturbation in the tidal flat setting, a lack of inclination errors, and the consistent north-directed magnetization acquired by experimentally slurried bay sediment (simulating bioturbation) suggest that the remanent magnetization is a postdetrital remanent magnetization related to bioturbation of wet tidal flat sediments.

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