Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS15] Evolution of Pelagic Realm

Mon. May 27, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Atsushi Matsuoka(Department of Geology, Faculty of Science, Niigata University), Katsunori Kimoto(Japan Agency for Marine-Earth Science and Technology), Toshiyuki Kurihara(Graduate School of Science and Technology, Niigata University), Tetsuji Onoue(Earth and Environmental Sciences, Graduate School of Science and Technology, Kumamoto University)

[MIS15-P02] Radiolarian phylogeny around the Jurassic–Cretaceous boundary

*Atsushi Matsuoka1 (1.Department of Geology, Faculty of Science, Niigata University)

Keywords:Jurassic–Cretaceous boundary , radiolarians, phylogeny

The Global Boundary Stratotype Section and Point (GSSP) of the Jurassic–Cretaceous boundary (JKB) is the last among the GSSPs in the Phanerozoic. It is defined as the base of the Berriasian Stage. Radiolarians are good candidates for defining the JKB because they are wide spread and can be found both pelagic and neritic marine environments. Pelagic sequences across the JKB have been reported in ODP/IODP sites in the western Pacific and land sections in Japan, the Philippines, southern Tibet, Iran and others. Evolutionary lineages of several radiolarian taxa across the JKB are reviewed and suitable bioevents, which are approximate to the JKB, are presented. These lineages include the radiolarian genera: Alievium, Archaeodictyomitra, Cinguloturris, Complexapora, Crococapsa, Doliocapsa, Emiluvia, Eucyrtidiellum, Hemicryptocapsa, Hsuum, Loopus, Mirifusus, Mesovallupus, Neorelumbra, Pantanellium, Protovallupus, Protunuma, Pseudodictyomitra, Ristola, Spinosicapsa, Tethysetta, Thanarla, Vallupus, Xitus, and Zhamoidellum. Among them the LoopusPseudodictyomitra lineage, the Protovallupus–Mesovallupus–Vallupus lineage, and Complexapora lineage are important phylogeny for defining the JKB.