Planktonic foraminifera from DSDP Leg 90 holes and DSDP Site 89-586

Planktonic foraminifers from DSDP Site 586 on Leg 89 and Sites 587-594 on Leg 90, cored by the Glomar Challenger from the equator to subantarctic waters of the southwest Pacific, are recorded. Five zonal schemes were used because of latitudinal changes in faunal assemblages and these are discussed; inter site correlation was established by selected datum species. Major epoch boundaries were normally marked by the following species: Pliocene/Pleistocene, the appearance of Globorotalia truncatulinoides; Miocene/Pliocene, appearance of G. tumida in the north and the extinction of G. conomiozea in the south; Oligocene/Miocene, the appearance of Globoquadrina dehiscens at 586, 588, and 593; Eocene/Oligocene, at the extinction of Globigerinatheka index. […]

本文记录了由“格洛玛·挑战者”号（Glomar Challenger）钻探船在西南太平洋赤道至亚南极海域执行第89航次和第90航次期间，于深海钻探计划（Deep Sea Drilling Project, DSDP）586站位及第587至594站位钻取的沉积物中产出的浮游有孔虫（planktonic foraminifers）。鉴于浮游有孔虫动物群组合存在纬度分异特征，本次研究采用了5套生物地层分带方案，并对各方案展开了讨论；通过选定的标志种建立了各站位间的地层对比关系。主要世级地层界线通常由以下物种标定：上新统/更新统界线以截锥圆辐虫（Globorotalia truncatulinoides）的首现为标志；中新统/上新统界线以北半球胖圆辐虫（G. tumida）的首现以及南半球圆锥形圆辐虫（G. conomiozea）的绝灭为标志；渐新统/中新统界线以586、588及593站位中破碎球房虫（Globoquadrina dehiscens）的首现为标志；始新统/渐新统界线以指状抱球虫（Globigerinatheka index）的绝灭为标志。[…]