Benthic foraminifera extinctions in the Cenozoic record ...

• Main Authors: Hayward, Bruce William, Johnson, Katherine, Sabaa, Ashwaq T, Kawagata, Shungo, Thomas, Ellen
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2010
• Subjects: Drilling/drill rig; Composite Core; Leg33; Leg80; Leg94; Leg143; Leg162; Leg167; Leg172; Glomar Challenger; Joides Resolution; Deep Sea Drilling Project DSDP; Ocean Drilling Program ODP; Hayward; Pacific; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.774877; https://doi.pangaea.de/10.1594/PANGAEA.774877

In the late Pliocene-middle Pleistocene a group of 95 species of elongate, cylindrical, deep-sea (lower bathyal-abyssal) benthic foraminifera became extinct. This Extinction Group (Ext. Gp), belonging to three families (all the Stilostomellidae and Pleurostomellidae, some of the Nodosariidae), was a major component (20-70%) of deep-sea foraminiferal assemblages in the middle Cenozoic and subsequently declined in abundance and species richness before finally disappearing almost completely during the mid-Pleistocene Climatic Transition (MPT). So what caused these declines and extinction?In this study 127 Ext. Gp species are identified from eight Cenozoic bathyal and abyssal sequences in the North Atlantic and equatorial Pacific Oceans. Most species are long-ranging with 80% originating in the Eocene or earlier. The greatest abundance and diversity of the Ext. Gp was in the warm oceanic conditions of the middle Eocene-early Oligocene. The group was subjected to significant changes in the composition of the ... : Supplement to: Hayward, Bruce William; Johnson, Katherine; Sabaa, Ashwaq T; Kawagata, Shungo; Thomas, Ellen (2010): Cenozoic record of elongate, cylindrical, deep-sea benthic foraminifera in the North Atlantic and equatorial Pacific Oceans. Marine Micropaleontology, 74(3-4), 75-95 ...