Upper Miocene Ostracoda in a gravity flow deposit in Central Japan: significance of paleogeography and paleoceanography

Genus Neosinocythere is described from the upper Miocene Itahana Formation in Central Japan, documenting the first record from Japan. The Neosinocythere species were discovered in gravity-flow sediments that were deposited below a depth of 84.9 m with a paleo-summer bottom temperature of 23.7°C and...

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Veröffentlicht in:Journal of paleontology 2019-07, Vol.93 (4), p.727-739
Hauptverfasser: Tanaka, Gengo, Moriwaki, Hiroshi
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description Genus Neosinocythere is described from the upper Miocene Itahana Formation in Central Japan, documenting the first record from Japan. The Neosinocythere species were discovered in gravity-flow sediments that were deposited below a depth of 84.9 m with a paleo-summer bottom temperature of 23.7°C and a paleo-winter bottom temperature of 14.1°C, based on a modern analog technique using the ostracode assemblage. Paleobiogeographical and paleoenvironmental analyses indicate that Neosinocythere appeared around the southeastern coast of the Eurasian continent, extended distribution in the northern coast of the Eurasian continent before migrating southward along the coast of the Eurasian continent as global temperatures decreased. The high-diversity area shifted from high latitudes to low latitudes.
doi_str_mv 10.1017/jpa.2018.103
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The Neosinocythere species were discovered in gravity-flow sediments that were deposited below a depth of 84.9 m with a paleo-summer bottom temperature of 23.7°C and a paleo-winter bottom temperature of 14.1°C, based on a modern analog technique using the ostracode assemblage. Paleobiogeographical and paleoenvironmental analyses indicate that Neosinocythere appeared around the southeastern coast of the Eurasian continent, extended distribution in the northern coast of the Eurasian continent before migrating southward along the coast of the Eurasian continent as global temperatures decreased. 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source Jstor Complete Legacy; Cambridge University Press Journals Complete
subjects Analogs
Arthropoda
Asia
assemblages
biogeography
Bottom temperature
Cenozoic
Conglomerates
Crustacea
electron microscopy data
Far East
faunal list
Gangyo River
Global temperatures
Gravitation
Gravity
Gravity flow
Gumma Japan
Honshu
Itahana Formation
Japan
Latitude
lithostratigraphy
Mandibulata
marine environment
microfossils
Miocene
morphology
Neogene
Neosinocythere
New records
Ostracoda
Palaeoceanography
paleo-oceanography
paleobathymetry
Paleoceanography
paleoclimatology
paleoenvironment
paleogeography
Paleontology
paleotemperature
Podocopida
Sediments
SEM data
Stratigraphy
Takasaki Japan
taxonomy
Tertiary
upper Miocene
title Upper Miocene Ostracoda in a gravity flow deposit in Central Japan: significance of paleogeography and paleoceanography
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