Figure F33. Variation in magnetic inclination with depth for the brown claystone in Core 192-1187A-2R and suggested correlation of the interpreted magnetic polarities with the geomagnetic polarity timescale (GPTS). ISEA is alternative name of reversed interval M''-1r'' (e.g., Tarduno et al., 1989) from the site code (Italy, Sentino stream, Site A) used by VandenBerg et al. (1978) in the initial recognition of this subchron.