Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean ...

• Main Authors: Kucera, Michal, Malmgren, Bjorn
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1996
• Subjects: Drilling/drill rig; Outcrop sample; Leg39; Leg43; Leg62; Leg74; Leg80; Leg122; Glomar Challenger; Joides Resolution; Deep Sea Drilling Project DSDP; Ocean Drilling Program ODP; Indian; Malmgren; Pacific; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.681878; https://doi.pangaea.de/10.1594/PANGAEA.681878

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.No differences in coiling direction (dextral proportions were > 90% in all samples), percentage of kummerform specimens (usually > 50%) and number of chambers in the last whorl (4-5) were observed between the sites. Both test size (expressed as spiral outline area and test volume) and total ... : Supplement to: Kucera, Michal; Malmgren, Bjorn (1996): Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean. Marine Micropaleontology, 28(1), 31-52 ...