Early to Middle Miocene Ostracods from the Yatsuo Group, Central Japan: Significance for the Bathyal Fauna between Japan Sea and Northwest Pacific Ocean During the Back-Arc Spreading

Ozawa, Hirokazu

doi:10.2517/2015pr028

Cited by 7 publications

(3 citation statements)

References 81 publications

(111 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Globobulimina Chilostomella Jorissen, 1999 Nonionella stella denitrification Bernhard et al, 2012;Fontanier et al, 2014Cribrostomoides Cyclammina Jorrisen et al, 1998 e.g., Murray, 2006 4 Spirosigmoili 1981, 1992Amano et al 200017-16 Ma Amano et al, 2004Ozawa, 2016Ozawa, , 1992Ozawa, , 1990 600 Akagi, S., Nakashima, H. and Noto, M. , 1992, Sedimentary environment of muddy facies, the Middle Miocene Tottori Group: The facies change of the Fuganji Mudstone Member Mem. Geol.…”

Section: Globobulimina Auriculata Nonionella Miocenica Valvulineria Mmentioning

confidence: 99%

Miocene foraminiferal assemblage occurred from the lower part of the Josoji Formation, Shimane Peninsula, southwest Japan, and its geological implication

Nomura¹,

Tanaka

Tsujimoto

2018

Jour. Geol. Soc. Japan

View full text Add to dashboard Cite

The lower-middle Miocene biostratigraphy of the Shimane Peninsula is difficult to interpret due to limited fossil occurrences in the lower Josoji Formation. In contrast, the middle-upper Josoji Formation and the underlying Koura Formation are rich in deep-sea foraminifera and non-marine to brackish fossils, respectively. We identified a diverse microfossil assemblage in the lower Josoji Formation that indicates deposition in dee-water environment that transitioned to the oceanic conditions. The microfossil assemblage consists mainly of agglutinated foraminifera such as Martinottiella communis and Spirosigmoilinella compressa, and calcareous hyaline forms such as Ammonia honyaensis, Valvulineria masudai, Globobulimina auriculata, and Nonionella miocenica. We therefore define this as the Spirosigmoilinella compressa-Globobulimina auriculata Zone. The assemblage indicates upper to middle bathyal paleodepths and a poorly oxygenated depositional environment. The first occurrences of Spirosigmoilinella compressa and Martinottiella communis were identified in ODP Site (Japan Sea). These species co-occurred just before the appearance of calcareous-rich foraminifera, similar to their occurrence in the lower Josoji Formation. The indicated geological age of the lower S. compressa-G. auriculata Zone is about. Ma, based on the biochronology of Miocene calcareous nannofossils of Backman et al. (). The biostratigraphy indicates progressive deepening of the sedimentary basin during deposition of the Koura to Josoji formations. This resulted in deep brackish waters during the earliest depositional period of the Josoji Formation, which explains the lack of foraminifera in the lower section. The appearance of both benthic and planktonic foraminifera along with nannofossils is interpreted as indicating a large-scale inundation of seawater. The basin, which was initially filled with brackish water, was then completely filled by seawater. This geological event, indicating abrupt water exchange, has important implications for the initial opening of the Japan Sea.

show abstract

Section: Globobulimina Auriculata Nonionella Miocenica Valvulineria Mmentioning

confidence: 99%

Miocene foraminiferal assemblage occurred from the lower part of the Josoji Formation, Shimane Peninsula, southwest Japan, and its geological implication

Nomura¹,

Tanaka

Tsujimoto

2018

Jour. Geol. Soc. Japan

View full text Add to dashboard Cite

show abstract

“…show higher abundance under the strong influence of the TWC and high-amplitude climate changes after the MBE. Robertsonites hanaii is considered endemic to the Sea of Japan, commonly found in cool water (2 − 5°C) on the outer shelf to bathyal depths (Ishizaki and Irizuki 1990; Ikeya and Suzuki 1992; Yamada 2003; Ozawa and Kamiya 2005a; Ozawa 2016). The active swimmer Propontocypris spp.…”

Section: Resultsmentioning

confidence: 99%

Deep-sea ostracod faunal dynamics in a marginal sea: biotic response to oxygen variability and mid-Pleistocene global changes

Huang¹,

Yasuhara²,

Iwatani³

et al. 2018

Paleobiology

View full text Add to dashboard Cite

Deep-sea benthic ostracod assemblages covering the last 2 Myr were investigated in Integrated Ocean Drilling Program Site U1426 (at 903 m water depth) in the southern Sea of Japan. Results show that (1) orbital-scale faunal variability has been influenced by eustatic sea-level fluctuations and oxygen variability and (2) secular-scale faunal transitions are likely associated with the mid-Brunhes event (MBE, ~0.43 Ma) and the onset of the Tsushima Warm Current (TWC, ~1.7 Ma). Krithe, Robertsonites, and Acanthocythereis are the three most abundant genera throughout the core, accounting for 78.5% of total specimens. Multiple-regression tree analysis indicated that the TWC, the MBE, and oxygen content are the significant controlling factors of ostracod dominance. Changes in assemblages exhibit decline and recovery patterns corresponding to orbital-scale cyclicity of sea-level changes. In the Sea of Japan marginal ocean setting, this cyclicity shows a close relationship with bottom-water oxygen variability since the onset of the TWC influx. The MBE amplified the influence of the TWC and oxygen variability to the deep-sea ecosystem through larger sea-level fluctuations. Acanthocythereis dunelmensis, a circumpolar species, dominates before the TWC onset. After the TWC onset and during the mid-Pleistocene transition (MPT, ~1.2–0.7 Ma) Krithe spp., known for their low-oxygen tolerance, substantially increase under moderate oxygen depletion. At the end of the MPT, Krithe dominance diminishes and is replaced by Robertsonites hanaii and Propontocypris spp. after the MBE. The post-MBE assemblage, characterized by R. hanaii, suggests a slightly warmer environment under the development of the TWC. In addition, the post-MBE high-amplitude climate system may have caused the increased abundance of active-swimming Propontocypris spp. due to their superior migration ability. Benthic ecosystems in marginal seas are sensitive and vulnerable to both short- and long-term climatic changes, and the MBE is suggested to be a global biotic event affecting benthic ecosystems substantially.

show abstract

“…The Kurosedani and Higashibessho formations are rich in fossils, such as molluscs (e.g., Tsuda 1960;Shimizu et al 2000;Amano et al 2004), benthic foraminifera (e.g., Chiji 1954;Hasegawa and Takahashi 1992), ostracods (Ozawa 2016), and elasmobranchs (e.g., Nishimatsu andUjihara 2019, 2020). The sampling horizons of the Kuro-sedani and Higashibessho formations seem to have been deposited in a wide range of sublittoral to bathyal depths based on an analyses of benthic foraminifera, molluscs, and ostracods (Hasegawa and Takahashi 1992;Shimizu et al 2000;Ozawa 2016). Yanagisawa (1999) placed the Higashibessho Formation in the diatom zones NPD3A-4A of Yanagisawa and Akiba (1988).…”

Section: Yatsuo Groupmentioning

confidence: 99%

Lanternfish otoliths (Myctophidae, Teleostei) from the Miocene of Japan

Schwarzhans¹,

Ohe²,

Tsuchiya³

et al. 2022

ZITT

View full text Add to dashboard Cite

Lanternfishes (Myctophidae) are one of the most common groups of fishes in the mesopelagic zone of the world ocean, and their otoliths have been dominant in pelagic sediments since at least Miocene times. Many species have a wide geographic distribution, with several being circumglobal. This wide distribution makes myctophid otoliths potentially useful for supraregional stratigraphic purposes. The Sea of Japan and the Northwest Pacific is an important region for investigations into the diversity and evolution of the Myctophidae. Here, we describe a large collection of myctophid otoliths from the late early to early middle Miocene (late Burdigalian to early Langhian) from six localities on western and central Honshu, which were under warm water influence during that time. A total of 22 species are recognized, of which eight are new. In the order in which they are described, the new species are Bolinichthys higashibesshoensissp. nov., Ceratoscopelus brevissp. nov., Lampadena eximasp. nov., Lampanyctus lenticularissp. nov., Lampanyctus tsuyamaensissp. nov., Stenobrachius ohashiisp. nov., Diaphus epipedussp. nov., and Diaphus watatsumisp. nov. At least nine species are also known from coeval sediments outside of Japan, most notably New Zealand and Europe. This distribution reflects the extraordinary geographic spread of myctophid species already in the early Miocene and indicates the potential for their future use for biostratigraphic purposes. The paleoecological and paleobiogeographical implications of the studied myctophid otolith assemblages are discussed. Furthermore, the stratigraphic ranges of the observed species are discussed and compared with data from other regions of the world in an attempt to outline the potential future application of myctophid otoliths for supraregional biostratigraphic purposes.

show abstract

Early to Middle Miocene Ostracods from the Yatsuo Group, Central Japan: Significance for the Bathyal Fauna between Japan Sea and Northwest Pacific Ocean During the Back-Arc Spreading

Cited by 7 publications

References 81 publications

Miocene foraminiferal assemblage occurred from the lower part of the Josoji Formation, Shimane Peninsula, southwest Japan, and its geological implication

Miocene foraminiferal assemblage occurred from the lower part of the Josoji Formation, Shimane Peninsula, southwest Japan, and its geological implication

Deep-sea ostracod faunal dynamics in a marginal sea: biotic response to oxygen variability and mid-Pleistocene global changes

Lanternfish otoliths (Myctophidae, Teleostei) from the Miocene of Japan

Contact Info

Product

Resources

About

Early to Middle Miocene Ostracods from the Yatsuo Group, Central Japan: Significance for the Bathyal Fauna between Japan Sea and Northwest Pacific Ocean During the Back-Arc Spreading

Cited by 7 publications

References 81 publications

Miocene foraminiferal assemblage occurred from the lower part of the Josoji Formation, Shimane Peninsula, southwest Japan, and its geological implication

Miocene foraminiferal assemblage occurred from the lower part of the Josoji Formation, Shimane Peninsula, southwest Japan, and its geological implication

Deep-sea ostracod faunal dynamics in a marginal sea: biotic response to oxygen variability and mid-Pleistocene global changes

﻿Lanternfish otoliths (Myctophidae, Teleostei) from the Miocene of Japan

Contact Info

Product

Resources

About

Lanternfish otoliths (Myctophidae, Teleostei) from the Miocene of Japan