Radiocarbon dates obtained from undisturbed alluvium overlying the La Nacion fault in the San Diego area indicate that the fault has not been active during Holocene time. The minimum age of alluvium at Poggi Canyon is 13,375 ± 275 yr B.P. This does not agree with the findings of a previously published report that indicates an offset of 1 m in alluvium dated at 10,980 ± 190 yr B.P.

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