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Figure F1. Age map of the Cocos plate and corresponding regions of the Pacific and Nazca plates. Isochrons at 5 m.y. intervals have been converted from magnetic anomaly identifications according to the timescale of Cande and Kent (1995). Selected DSDP and ODP sites that reached basement are indicated by circles. The wide spacing of the 10 to 20 Ma isochrons to the south reflects the extremely fast (200–220 mm/y) full spreading rate. Dashed box shows location of Figure F7A, which shows details of magnetic anomalies near Site 1256. FZ = fracture zone.

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