sentences:  It appears that the Aptian-Albian volcanic episode was largely restricted to the region south of present 20°N latitude.Paleomagnetic and plate kinematic considerations place this broad region of off-ridge volcanism in the present vicinity of Polynesia, where today off-ridge volcanism, shallow bathymetry, and thin lithosphere is known as the 'Superswell' (; ).The figure above shows the typical sediments drilled at Ocean Drilling Program site 1149, east of the Izu-Bonin segment.