Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean@en

The morphological variability (coiling properties, size and shape) of the planktic foraminifer Contusortuncana contusa (Cushman) in the terminal Cretaceous ocean was examined at eight deep-sea sites and two continental sections from low (16°) to middle (42°) paleolatitudes in both hemispheres. The material used in this study includes samples from the South Atlantic (DSDP Sites 356, 527 and 525A), North Atlantic (Sites 384 and 548A), Indian and Pacific Oceans (DSDP Site 465A and ODP Sites 761C and 762C) and Tethyan Ocean (outcrop sections from El-Kef and Caravaca). On average 45 specimens from two samples per location were analysed, from an interval corresponding approximately to the last 60 kyr of the Cretaceous. […]本研究针对白垩纪末期海洋中浮游有孔虫（planktic foraminifer）Contusortuncana contusa (Cushman)的形态变异性（旋卷特性、大小与形态），在南北半球古纬度16°至42°的低-中古纬度范围内，于8个深海站位与2个陆相剖面中开展了分析。本研究所用样品采自南大西洋（深海钻探计划[Deep Sea Drilling Project, DSDP]356、527及525A站位）、北大西洋（384、548A站位）、印度洋与太平洋（深海钻探计划465A站位及大洋钻探计划[Ocean Drilling Program, ODP]761C、762C站位）以及特提斯洋（Tethyan Ocean，取自El-Kef与Caravaca露头剖面）。每个采样点均采集两份样品，平均每份分析45个标本，采样层段大致对应白垩纪最后6万年的地层序列……