Proc. IODP, 342, Data report: late Eocene–early Oligocene ostracods at IODP Site U1411, off Newfoundland, North Atlantic

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Chapter contents Abstract Introduction Methods and materials Results Acknowledgments References Figures F1. Location of Site U1411. F2. Tracing of specimens. F3. Krithe crassicaudata and Messinella valve length vs. height. Tables T1. Specimen measurements and features. T2. Krithe crassicaudata measurements. T3. Ostracod taxa counts from Hole U1411B sediments. Plates P1. SEM images, adult and juvenile left and right valves. P2. SEM images, adult left and right valves. P3. SEM images, adult and juvenile left and right valves. P4. SEM images, adult left and right valves. P5. SEM images, adult right and juvenile left valves. P6. Transmitted light images of specimen internal structures. Appendix Systematic paleontology of selected taxa PDF file			Previous \| Next doi:10.2204/iodp.proc.342.206.2018 Introduction Under the North Atlantic Deep Water (NADW), modern ostracod faunas are characterized by Krithe, Poseidonamicus, Henryhowella, and Abyssocythere (Dingle and Lord, 1990). Benson (1975) named the faunas with Krithe, Poseidonamicus, Henryhowella, and Abyssocythere as the psychrosphere fauna and considered that it appeared during the Eocene–Oligocene transition. Using foraminifer stable isotope and Nd isotopes, some studies hypothesize that the NADW was initially formed during the early Oligocene (e.g., Via and Thomas, 2006; Katz et al., 2011). The formation of the psychrosphere fauna is being argued (e.g., Dall’Antonia et al., 2003), but it may be linked to the formation of NADW. Because some of the characteristic taxa originated from the early Paleogene, the psychrosphere fauna may have been formed before the late Eocene (e.g., Steineck et al., 1984; Guernet and Bellier, 2000). In the North Atlantic Ocean, the Eocene–Oligocene ostracods are poorly understood, with only limited data (Ducasse and Peypouquet, 1979; Coles and Whatley, 1989; Whatley and Coles, 1991; Coles et al., 1994; Coles, 1996; Guernet and Bellier, 2000) (Fig. F1). Previously, Coles and Whatley (1989) described 3 new genera and 21 new species from the upper Eocene to lower Oligocene sediments at Deep Sea Drilling Project (DSDP) Sites 549, 550, and 558. Coles et al. (1994) studied the taxonomy and biostratigraphy of the genus Krithe in the North Atlantic Ocean and proposed 4 new taxa of Krithe from the upper Eocene to lower Oligocene sediments at Sites 549 and 550. Guernet and Bellier (2000) reported 51 taxa from the upper Eocene sediments at Ocean Drilling Program (ODP) Sites 1052 and 1053. Here, I report and illustrate 23 taxa of late Eocene–early Oligocene ostracods from Integrated Ocean Drilling Program (IODP) Site U1411, off Newfoundland in the North Atlantic Ocean. At IODP Site U1407, Yamaguchi et al. (2017b, 2017c) already reported and described 32 ostracod taxa from Maastrichtian–Thanetian sediments. Top of page \| Previous \| Next

Introduction