Figure F3. A. Position and thickness in meters of the equatorial sediment bulge in the equatorial Pacific Ocean (after Mitchell, 1998). The thickest pile of sediments is displaced from the equator by the northwestward movement of the Pacific plate. Because of Pacific plate movement, Paleogene equatorial sediments lie beneath a relatively thin Neogene sediment column. B. Representative, latitudinal cross-section of sediment mass density in the tropical Pacific Ocean based on previous DSDP results.