notated record of the detailed examination of Mn deposits from DSDP Leg 89 (Hole 585)

Because drilling during the DSDP-IPOD program had not yet succeeded in sampling Jurassic sediments from the Mesozoic superocean, remnants of which remain in the western Pacific, Leg 89 was designed to recover sediments of probably Bathonian-Callovian age (150-160 m.y. old). Recovery of such sediments would enable us to compare Mesozoic superocean strata and paleoenvironmental conditions with Atlantic sediments, paleoenvironments of similar age, and coeval strata deposited along Tethyan continental margins-now exposed in Tertiary fold belts. It was expected that this Mesozoic sediment record could be recovered at Site MZP-6 (Leg 89, Site 585) in the deep East Mariana Basin.