Proc. IODP, 342, Data report: relative abundance of benthic foraminiferal morphotypes across the Eocene/Oligocene and Oligocene/Miocene boundaries (IODP Expedition 342 Site U1406, North Atlantic)

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Abstract Introduction Materials and methods Site studied Samples analyzed Results Abundance and preservation Relative abundance of benthic morphotypes Acknowledgments References Figures F1. Site location. F2. Foraminifer preservation and group abundance. Tables T1. Distribution of morphotypes. T2. Morphotype faunal components. PDF file			Previous \| Next doi:10.2204/iodp.proc.342.204.2016 Data report: relative abundance of benthic foraminiferal morphotypes across the Eocene/Oligocene and Oligocene/Miocene boundaries (IODP Expedition 342 Site U1406, North Atlantic)¹ Kazuyoshi Moriya² and Oliver Friedrich³ Abstract Relative abundances of five benthic foraminiferal morphotype groups (i.e., agglutinated, elongated, planispiral, tapered, and trochospiral) from the late Paleocene to early Miocene at Site U1406 (Integrated Ocean Drilling Program Expedition 342) are reported. Benthic foraminiferal tests from Site U1406 are generally very well preserved and occur abundantly from the late Eocene through middle Oligocene; they are less abundant for the remainder of the studied interval. Among the five morphotypes identified in this study, tapered and trochospiral forms are the dominant groups. Thereby, tapered morphotypes show increasing abundances at and above the Eocene/Oligocene and Oligocene/Miocene boundaries. Agglutinated and planispiral morphotypes are minor components throughout the studied interval. Relative abundances of the elongated morphotype abruptly increase during the lower Eocene. This increase can be correlated to a distinct decrease in carbonate content between lithostratigraphic Units III and IV. ¹ Moriya, K., and Friedrich, O., 2016. Data report: relative abundance of benthic foraminiferal morphotypes across the Eocene/Oligocene and Oligocene/Miocene boundaries (IODP Expedition 342 Site U1406, North Atlantic). In Norris, R.D., Wilson, P.A., Blum, P., and the Expedition 342 Scientists, Proceedings of the Integrated Ocean Drilling Program, 342: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.342.204.2016 ² Department of Earth Sciences, Faculty of Education and Integrated Arts and Sciences, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo 169-8050, Japan. kmoriya@waseda.jp ³ Institut für Geowissenschaften, Universität Heidelberg, Im Neuenheimer Feld 234-236, 69120 Heidelberg, Germany. Initial receipt: 31 March 2016 Acceptance: 15 September 2016 Publication: 16 December 2016 MS 342-204 Top of page \| Previous \| Next