Temporal changes of planktonic foraminiferal assemblages in the middle Miocene Hatatate Formation along the Natori-gawa section, Sendai City, northeast Honshu, Japan

Author(s): Idehara, Yuki; Hayashi, Hiroki; Fujiwara, Osamu; Kumazawa, Daisuke; Irizuki, Toshiaki
Author Affiliation(s): Primary:
Shimane University, Interdisciplinary Graduate School of Science and Engineering, Shimane, Japan
National Institute of Advanced Industrial Science and Technology, Japan
Volume Title: Kaseki Fossils
Source: Tokyo [Kaseki = Fossils, Vol.94, p.5-18. Publisher: Palaeontological Society of Japan,], Japan. ISSN: 0022-9202
Note: In Japanese with English summary. 44 refs.; illus., incl. strat. cols., 1 plate, 1 table, geol. sketch map
Summary: We analyzed planktonic foraminiferal assemblages of the Middle Miocene Hatatate Formation distributed along the Natori-gawa River in the southwestern part of Sendai City, Northeast Honshu, Japan. The Hatatate Formation mainly consists of fine-grained sandstone with intercalating tuff beds served as key beds. According to index species, we recognized seven biohorizons. The studied sequence is correlated with planktonic foraminiferal Zones N. 12 to N. 14. These results are generally concordant with previous studies including diatom biostratigraphy and fission-track ages. The temporal changes of assemblages indicate a pair of cooling and warming events of surface water at the middle to upper part of the studied sequence. The cooling event corresponds to the oxygen isotope peak event Mi5.
Year of Publication: 2013
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Asia; Assemblages; Atlantic Ocean; Biostratigraphy; Biozones; Cenozoic; DSDP Site 590; DSDP Site 608; Deep Sea Drilling Project; Far East; Faunal list; Foraminifera; Hatatate Formation; Honshu; IPOD; Invertebrata; Japan; Leg 90; Leg 94; Lithostratigraphy; Lord Howe Rise; Marine environment; Microfossils; Middle Miocene; Miocene; Miyagi Japan; Morphology; Neogene; North Atlantic; Northeast Atlantic; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleoenvironment; Planktonic taxa; Protista; Sendai Japan; South Pacific; Southwest Pacific; Tertiary; Tests; West Pacific
Coordinates: N381500 N381500 E1405000 E1405000
N425012 N425013 W0230515 W0230515
S311002 S311001 E1632131 E1632130
Record ID: 2014048569
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