Figure F7. Age map of the Cocos plate and corresponding regions of the Pacific plate. 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 10- to 20-m.y. isochrons to the south reflects the extremely fast (200–220 mm/yr) full spreading rate. Dashed boxes show locations of figures showing details of magnetic anomalies near Site 1256 (Fig. F8) and the Alijos Rocks survey area (Fig. F13). FZ = fracture zone.