Cyclic sea-level changes based on fossil ostracode faunas from the Upper Pliocene Sasaoka Formation, Akita Prefecture, northeast Japan

Yamada, Keigo; Irizuki, Toshiaki; Tanaka, Yuichiro

doi:10.1016/s0031-0182(02)00281-x

Cited by 37 publications

(30 citation statements)

References 17 publications

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“…3. Sections ME, MN, TN, and TS are more or less the same as those described by Yamada et al (2002), but we have revised the correlations of the sections on the basis of our new work, which includes determinations of magnetic polarity. The Sasaoka Formation in this area is~750 m thick and consists mainly of gray, muddy, fine sandstone with many intercalations of tuff.…”

Section: Geological Settingmentioning

confidence: 99%

“…In the study area, the uppermost part of the Sasaoka Formation is not exposed, but the local top can be seen in section YN very close to the fold axis of the Gojome syncline. The Sasaoka Formation is fossiliferous and contains wellpreserved mollusks (Hase and Hirayama, 1970;Honda, 1978;Shimamoto, 1984;Matsui, 1985a, b), ostracodes (Ishizaki and Matoba, 1985;Yamada et al, 2002), foraminifers (Matsui, 1981), and calcareous nannofossils (Sato et al, 1999(Sato et al, , 2001.…”

Section: Geological Settingmentioning

confidence: 99%

“…Calcareous nannofossil datum (CND) A, one of the important late Pliocene datum planes (Sato and Kameo, 1996), is present at~200 m below the OS-1 tuff (Sato et al, 1999(Sato et al, , 2001Yamada et al, 2002), as illustrated in Fig. 3.…”

Section: Geological Settingmentioning

confidence: 99%

“…10. This was revised from the sedimentary accumulation rate curve proposed by Yamada et al (2002) by using our new magnetostratigraphic data and the CNDs. The updated ageedepth model indicates that the upper three-quarters of the Sasaoka Formation ranges in age from ca.…”

Section: Implications Of the Magnetostratigraphymentioning

confidence: 99%

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Paleomagnetic study of Plio-Pleistocene sediments in the concentrated deformation zone along the eastern margin of the Japan Sea

Hoshi

Yamada

2016

Quaternary International

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Implications Of the Magnetostratigraphymentioning

confidence: 99%

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Paleomagnetic study of Plio-Pleistocene sediments in the concentrated deformation zone along the eastern margin of the Japan Sea

Hoshi

Yamada

2016

Quaternary International

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“…Biofacies B, C Subbiofacies A2, A3 -, 1984;Oba et al, 1991;, 1996;Yokoyama et al, 2007Tada et al, 1999Kido et al, 2007 28,000 16,000 B.P. Yamada et al, 2005;Irizuki et al, 2007Cronin et al, 1994Irizuki, 1989Yamada et al, 2002; Cytherura miii Bicornucythere bisanensis Spinileberis quadriaquleata Spinileberis furuyaensis Cytheromorpha acupunctata , 1993;, 2003B. bisanensis C. miii C. acupunctata Ozawa, 1996B.…”

mentioning

confidence: 99%

Fossil ostracode assemblages in the Middle Pleistocene upper part of the Sawane Formation on Sado Island, Niigata Prefecture, central Japan and surface water freshening of the Sea of Japan

Ishida¹,

Yoshida²,

Matsuoka³

2012

Jour. Geol. Soc. Japan

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Evidence of surface water freshening during the late Quaternary glacial period has been recognized in deep-sea cores from the Sea of Japan. However, no evidence of seawater freshening in shallow-water environments during the glacial period has been found in the shallow marine strata in the Sea of Japan and along its coasts. In this study, changes in fossil ostracod taxa from the upper Sawane Formation in Niigata Prefecture, central Japan were investigated to clarify environmental changes during the Middle Pleistocene. Based on the fossil ostracod taxa present and the proportions of each taxon, we estimate that relative sea level changed between the lower sublittoral and upper bathyal zones at water depth of -m. Taxa that favored colder temperatures and lower salinities were abundant during lowstand period; in contrast, despite the high sea level only one warmwater ostracod was found in the study sections. This suggests that the upper Sawane Formation underwent environmental changes between the interstadial and glacial periods. Low-salinity ostracod taxa were scarce or absent in Pliocene and lower Pleistocene strata along the coasts of the Sea of Japan, and were absent during the high-stand period in the study sections. The ostracod taxa from low-salinity environments in the study sections differ from those dominant in regional low-salinity environments, such as estuaries and river mouths, in the modern Sea of Japan. These low-salinity taxa and other ostracod species that survived the surface water freshening event in the Sea of Japan during the late Quaternary now inhabit similar temperature and salinity environments. These observations provide evidence for a desalination of surface waters in the Sea of Japan in the Middle Pleistocene, in contrast to the restriction of low-salinity water to regional shallow environments that occurred during the glacial period.

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Taxonomy, morphology and speciation of the Semicytherura henryhowei group (Crustacea, Ostracoda)

2005

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The genus Semicytherura belongs to the family Cytheruridae, and was distinguished from Cytherura on the basis of carapace features. Species of Semicytherura from Japan and adjacent seas can be divided into two groups. One is represented by Semicytherura miurensis Hanai, 1957, characterized by a thin, oval carapace covered with fine reticulation. The other is represented by Semicytherura henryhowei Hanai & Ikeya, 1977, characterized by a thick sub-rectangular carapace in lateral view. Semicytherura henryhowei, which is distributed from Hokkaido to Okinawa in Japan, has been regarded as having several morphotypes distinguishable on outline and reticulation of carapace. However, as a result of detailed observations on the copulatory organ, carapace outline and distributional pattern of pore systems, remarkable differences are shown to exist between the two most frequently occurring morphotypes. In order to recognize S. henryhowei sensu stricto, the carapace of the holotype was re-examined. Consequently, neither of the two morphotypes are considered to belong to S. henryhowei due to differences of carapace outline and distribution of pore systems. The two morphotypes are here regarded as independent taxa, described as new: S. kazahana n. sp. and S. sasameyuki n. sp. The geographical distributions of the two new species overlap, but their micro-habitats differ from each other; the former lives on calcareous algae on rocky shores, the latter lives on silty sand bottom within the inner bay. A third new species, S. slipperi sp. nov., is also described. In view of their present geographical distributions and fossil records, the origin of this group of species would appear to be the Japanese islands or adjacent areas in and after the Miocene. This group then migrated to the Arctic Ocean and East Pacific Ocean during or before the middle Pliocene.

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Cyclic sea-level changes based on fossil ostracode faunas from the Upper Pliocene Sasaoka Formation, Akita Prefecture, northeast Japan

Cited by 37 publications

References 17 publications

Paleomagnetic study of Plio-Pleistocene sediments in the concentrated deformation zone along the eastern margin of the Japan Sea

Paleomagnetic study of Plio-Pleistocene sediments in the concentrated deformation zone along the eastern margin of the Japan Sea

Fossil ostracode assemblages in the Middle Pleistocene upper part of the Sawane Formation on Sado Island, Niigata Prefecture, central Japan and surface water freshening of the Sea of Japan

Taxonomy, morphology and speciation of the Semicytherura henryhowei group (Crustacea, Ostracoda)

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