Magnetite anomalies of 52--80 Ma age have been mapped in the equatorial Pacific in a region where they were previously unrecognized. These anomalies, now at 7¿ N are best modeled with crustal rocks of negative inclination, apparently because the crust was formed at a spreading ridge that was south of the magnetic equator in Late Cretaceous-Early Tertiary time. Magnetic anomalies reocrded along a 5900-km trackline that follows a flowline of crystal generation show one long period, from 12 to 31 Ma, of apparent constant half-spreading rate over the 0 to 80 Ma represented. ¿ American Geophysical Union 1992