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During DSDP Leg 62, foraminifers were recovered from four holes in the central North Pacific. At Site 463, in the Mid-Pacific Mountains (21°21'N, 174° 40'E; water depth 2525 m), the Cretaceous section included Aptian-Albian to Maastrichtian sediments. Paleogene faunas occurred in a mixed zone in three cores from strata unconformably overlying the Cretaceous. Recovery was very poor at Site 464 (39°51'N, 173° 53'E; water depth 4637 m), on the northern flank of Hess Rise. Twenty-four cores of Cretaceous material encompassed the Cenomanian-Albian. Site 465 (Hole 465A) on southern Hess Rise (33°49'N, 178°55'E) was drilled at a depth of 2161 meters. The Cretaceous section includes upper Albian to uppermost Maastrichtian. The Cretaceous/Tertiary boundary was recovered in Hole 465A, and the combined Paleocene sections from both sites spanned all zones of the Paleocene. A mixed zone of Paleogene sediments overlies the Paleocene at Site 465. Because of the abundance of chert, only core catchers were recovered in many instances. Poor recovery characterized the Cretaceous section also at Site 466, on southern Hess Rise (34°H'N, 179° 15'E; water depth of 2665 m). The Cretaceous section includes 24 cores, of which half contain only core catchers; only the Campanian was successfully cored. Four overlying cores contain mixed Paleogene and Cretaceous materials, thus representing the commonly occurring Paleogene "mixed zone" of the central Pacific (Table 1; Figs. 1 and 2). Both planktonic and benthic foraminifers were present in nearly every sample younger than Aptian. Preservation varied from generally poor in most Albian samples at each site to very good in most of the Campanian-Maastrichtian section. Paleogene sequences were generally well preserved, except in the mixed zone, where dissolution and recrystallization were common.

Cretaceous and Early Tertiary Foraminifers from Deep Sea Drilling Project Leg 62 Sites in the Central Pacific