Biostratigraphy and correlation of the Lower to Middle Miocene in the Setouchi Geologic Province of the Kinki District, Southwest Japan

Irizuki, Toshiaki; Yanagisawa, Yukio; Kimura, Moeto; Kato, Kanefusa; Hoshi, Hiroyuki; Hayashi, Hiroki; Fujiwara, Yuki; Akai, Kazuyuki

doi:10.5575/geosoc.2021.0002

Cited by 6 publications

(2 citation statements)

References 28 publications

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“…4). The stratigraphic correlation is based on Yanagisawa (1999), Nakajima et al (2019), and Irizuki et al (2021). With respect to the N7/N8 boundary, we follow the geochronological timescale established by Hoshi et al (2019) in Japan of approximately 17 Ma (compared to 16.39 Ma in GTS 2020; Gradstein et al 2020).…”

Section: Stratigraphy and Biostratigraphic Correlationmentioning

confidence: 99%

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

Schwarzhans¹,

Ohe²,

Tsuchiya³

et al. 2022

ZITT

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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.

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Section: Stratigraphy and Biostratigraphic Correlationmentioning

confidence: 99%

“…The diatom zones (D.NPD) follow Yanagisawa and Akiba (1998). The stratigraphic correlation is based on Yanagisawa (1999), Nakajima et al (2019), andIrizuki et al (2021).…”

Section: Ichishi Groupmentioning

confidence: 99%

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

Schwarzhans¹,

Ohe²,

Tsuchiya³

et al. 2022

ZITT

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A new platanistoid (Odontoceti: Squalodelphinidae) from the Early Miocene of Japan

Tanaka,

Nakagawa

2024

Journal of Systematic Palaeontology

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Arc‐parallel extension in preparation of the rotation of southwest Japan: Tectonostratigraphy and structures of the Lower Miocene Ichishi Group

Kinoshita

Yamaji

2021

Island Arc

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Opening of the Japan Sea back arc basin was accompanied by extensional tectonics in the drifting southwest Japan arc. Various trends of Early Miocene grabens in the arc suggest multi-directional rifting, which necessarily involved strike-slip components of some of basin-margin faults. However, such components are not well understood. In this work we conducted a field survey in the Early Miocene Ichishi basin on the northern side of the Median Tectonic Line, central southwest Japan. We found that the basin was a compound of grabens that were formed along normal and sinistral strike-slip faults, the latter of which had northeast-southwest trends. The block faulting in this phase produced basement highs between sub-basins, which were filled with the lower part of the Ichishi Group. We found a low-angle angular unconformity at a middle horizon in the group, with which we define the upper and lower part of the group. The upper part onlapped both the basement highs and the lower part. It means that the transtensional basin formation ceased sometime between 18 and 17.5 Ma in the Ichishi area. The Ichishi basin turned subsequently into a sag basin subsided due to normal faulting probably along the Nunobiki-sanchi-toen fault zone. The transtension and the basin sag were driven by ENE-WSW extensional stress. This arc-parallel extension produced grabens various areas including Ichishi in the Early Miocene. The extensional deformation was eventually localized to the deep rift along the Fossa Magna to make the lithosphere under southwest Japan decoupled from that under northeast Japan. The decoupling allowed the rapid rotation of southwest Japan from ~17.5 Ma. The cluster of those grabens around the Ise bay probably determined the southeastern margin of the Kinki triangle.

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Biostratigraphy and correlation of the Lower to Middle Miocene in the Setouchi Geologic Province of the Kinki District, Southwest Japan

Cited by 6 publications

References 28 publications

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

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

A new platanistoid (Odontoceti: Squalodelphinidae) from the Early Miocene of Japan

Arc‐parallel extension in preparation of the rotation of southwest Japan: Tectonostratigraphy and structures of the Lower Miocene Ichishi Group

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Biostratigraphy and correlation of the Lower to Middle Miocene in the Setouchi Geologic Province of the Kinki District, Southwest Japan

Cited by 6 publications

References 28 publications

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

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

A new platanistoid (Odontoceti: Squalodelphinidae) from the Early Miocene of Japan

Arc‐parallel extension in preparation of the rotation of southwest Japan: Tectonostratigraphy and structures of the Lower Miocene Ichishi Group

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Product

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

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