scholarly journals High-resolution chronology of the lower Pleistocene Otadai and Umegase Formations of the Kazusa Group, Boso Peninsula, central Japan-Chronostratigraphy of the JNOC TR-3 cores based on oxygen isotope, magnetostratigraphy and calcareous nannofossil-

2005 ◽  
Vol 111 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Takashi Tsuji ◽  
Yuichiro Miyata ◽  
Makoto Okada ◽  
Isao Mita ◽  
Hiroshi Nakagawa ◽  
...  
Keyword(s):  
High Resolution ◽  
Oxygen Isotope ◽  
Calcareous Nannofossil ◽  
Central Japan ◽  
Boso Peninsula ◽  
Lower Pleistocene

Oxygen isotope stratigraphy and calcareous nannofossil biostratigraphy of the Lower Pleistocene in the Boso Peninsula, central Japan

Stratigraphy ◽  
2021 ◽  
Vol 18 (2) ◽  
Author(s):  
Daisuke Kuwano ◽  
Yoshimi Kubota ◽  
Kanako Mantoku ◽  
Koji Kameo
Keyword(s):  
Oxygen Isotope ◽  
Northwestern Pacific ◽  
Calcareous Nannofossil ◽  
Boso Peninsula ◽  
Oxygen Isotope Stratigraphy ◽  
Age Model ◽  
Calcareous Nannofossil Biostratigraphy ◽  
Isotope Stratigraphy ◽  
Pacific Coast Of Japan ◽  
Cyclic Changes

ABSTRACT: Oxygen isotope stratigraphy and calcareous nannofossil biostratigraphy in the upper part of the Kiwada Formation, which is part of the Kazusa Group in the Boso Peninsula in the central part of the Pacific coast of Japan, were examined to establish a high-resolution age model and estimate the age of the lower part of Pleistocene nannofossil biohorizons in the northwestern Pacific region. The new age model indicates that the upper part of the Kiwada Formation corresponds to Marine Isotope Stage (MIS) 41 through MIS 36. Two nannofossil biohorizons, the last occurrences of large forms of Gephyrocapsa (>5.5 micrometers) and Helicosphaera sellii,were recorded in the examined section. The LO of large Gephyrocapsa spp. coincides with the MIS 37/38 boundary which is 1241.2 plus or minus 0.4 ka. The LO of H. sellii is located in late MIS 40 and has a calculated age of 1291.4 plus or minus 1.4 ka. These biohorizons are traceable even though the LO of H. sellii is a diachronous event. Size variations of Gephyrocapsa from approximately 1250 ka are discussed and fluctuations of small size Gephyrocapsa could represent cyclic changes of the Kuroshio and Oyashio currents.

High-Resolution Oxygen Isotope Diagram of Late Pleistocene Ice Wedges of Seyakha Yedoma, Eastern Yamal Peninsula

2019 ◽  
Vol 487 (1) ◽  
pp. 823-826 ◽  
Author(s):  
Yu. K. Vasil’chuk ◽  
N. A. Budantseva ◽  
A. C. Vasil’chuk
Keyword(s):  
High Resolution ◽  
Oxygen Isotope ◽  
Late Pleistocene ◽  
Yamal Peninsula

scholarly journals High resolution integrated microbiostratigraphy of the Lower Jurassic (late Pliensbachian–early Toarcian) of central Italy

1998 ◽  
Vol 17 (2) ◽  
pp. 153-172 ◽  
Author(s):  
Raffaella Bucefalo Palliani ◽  
Emanuela Mattioli
Keyword(s):  
High Resolution ◽  
Evolutionary History ◽  
Central Italy ◽  
Lower Jurassic ◽  
High Potential ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
Dinoflagellate Cyst ◽  
History Of ◽  
Global Events

Abstract. The integrated use of calcareous nannofossil and dinoflagellate cyst events in a study of the late Pliensbachian–early Toarcian interval in central Italy has yielded a high resolution biostratigraphy. The use of both the first and last occurrences of selected taxa belonging to the two phytoplankton groups allows the dating of the sediments with a very refined detail, even when lithologies are unfavourable to the preservation of one fossil group. The evolutionary history of calcareous nannofossils and dinoflagellate cysts during the early Jurassic and its links with global events are responsible for the high potential of this integrated biostratigraphy.

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