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First discovery of Eocene coastal-estuarine ostracods from Japan, with the geological history of the migration of estuarine genera in the Far East

Published online by Cambridge University Press:  06 September 2017

GENGO TANAKA ,
YASUHISA HENMI ,
TOSHIFUMI KOMATSU ,
KOJI HIROSE ,
HIROAKI UGAI ,
SHIGEHIRO KAWANO  and
HARUYOSHI MAEDA
GENGO TANAKA*
Affiliation:
Institute of Liberal Arts and Science, Kanazawa University, Kakumama-machi, Kanazawa City, Ishikawa 920-1192, Japan
YASUHISA HENMI
Affiliation:
Center for Marine Environment Studies, Kumamoto University, 6061 Aitsu, Matushima, Kami-amakusa City, Kumamoto 861-6102, Japan
TOSHIFUMI KOMATSU
Affiliation:
Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Kumamoto 860-8555, Japan
KOJI HIROSE
Affiliation:
Goshoura Cretaceous Museum, 4310-5, Goshoura, Amakusa City, Kumamoto 866-0313, Japan
HIROAKI UGAI
Affiliation:
Goshoura Cretaceous Museum, 4310-5, Goshoura, Amakusa City, Kumamoto 866-0313, Japan
SHIGEHIRO KAWANO
Affiliation:
Tochigi Prefectural Museum, 2-2, Mutsu-machi, Utsunomiya City, Tochigi 320-0865, Japan
HARUYOSHI MAEDA
Affiliation:
Kyushu University Museum, 6-10-1, Hakozaki, Fukuoka 812-8581, Japan
*
†Author for correspondence: gengo@staff.kanazawa-u.ac.jp
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Abstract

The genus Neomonoceratina, which dominated the ostracod assemblage in the uppermost part of the Akasaki Formation (Miroku Group) of the Kyushu Island, Japan, is associated with the benthic foraminifer Ammonia cf. beccarii, mollusca Terebralia? sp. and Anomia sp., and the oogonium of Charophyceae, indicating a marine-to-brackish estuarine environment involving inflowing freshwater. This is the first record of Eocene coastal-estuarine ostracods from the eastern margin of the Eurasian continent and demonstrates that different pre-Neogene coastal-estuarine ostracod assemblages flourished in this region. The assemblages comprised five ostracod species (including one novel species) assigned to the genera Neomonoceratina, Paijeiborchella, Propontocypris and Parakrithella. These species exhibited genus-level links with the Eocene borehole cores along the continental shelf of the East China Sea and other areas of Kyushu. Fossil data of characteristic Eocene coastal-estuarine genera collected worldwide indicate that different characteristic genera inhabited each region. For example, Neomonoceratina originated on the Indian subcontinent by the Early Paleocene period at the latest, along with the northern drift of the Indian subcontinent. These species subsequently diversified west and east with the equatorial current and counter-current via the Tethys and reached the eastern margin of the Eurasian continent among the various eastwards-migrating species, where one genus ultimately adapted to the coastal-estuarine environment. Notably, the coastal-estuarine ostracod assemblage of the eastern margin of the Eurasian continent differs completely from that of the Tethys during the Eocene period. Our results suggest that coastal-estuarine ostracod assemblages are a powerful tool for palaeogeographic reconstruction.

Keywords

EoceneOstracodaKyushu IslandJapanpalaeoenvironmentspalaeobiogeography
Type
Original Article
Information
Geological Magazine , Volume 155 , Issue 8 , November 2018 , pp. 1742 - 1760
Copyright
Copyright © Cambridge University Press 2017 

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