On the Microbiostratigraphy of the Yatsuo Group in the Yatsuo District of Toyama Prefecture

Chiji, Manzo

doi:10.5575/geosoc.61.162

Cited by 2 publications

(1 citation statement)

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“…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).…”

Section: Yatsuo Groupmentioning

confidence: 99%

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: Yatsuo Groupmentioning

confidence: 99%

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

Schwarzhans¹,

Ohe²,

Tsuchiya³

et al. 2022

ZITT

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Revised Cenozoic chronostratigraphy and tectonics in the Yatsuo Area, Toyama Prefecture, central Japan

Nakajima

Iwano²,

Danhara³

et al. 2019

Jour. Geol. Soc. Japan

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We present a revised Cenozoic chronostratigraphy of the Yatsuo Area, Toyama Prefecture, based on U-Pb and fission-track (FT) dating of zircon grains from tuff beds, mineralogical analysis of tuff beds, and diatom biostratigraphy. The results reveal that syn-rift volcanism (represented by the Iwaine Formation) began at ~. Ma and that the Ikahama unconformity between the syn-rift Higashibessho Formation and the post-rift Tenguyama Formation represents a relatively short-duration (~. m.y.) event ~ Ma. The Otogawa Formation unconformably overlies the Tenguyama Formation and is divided into middle Miocene (Serravallian) and late Miocene, with a possible unconformity in between. The-Ma Mita Formation unconformably overlies the Otogawa Formation. These results require previous local correlations of a key tuff bed (MT) in the Mita Formation to be reassessed. Facies and sequence stratigraphic analysis of the lowermost Nirehara Formation confirm that this formation comprises multiple depositional cycles generated by water-level fluctuations in a coastal or lacustrine fan delta. The results also suggest that the Nirehara Formation, which is unconformably overlain by the syn-rift Yatsuo Group, was formed in an early rift basin. Detrital zircon U-Pb and FT dating of sandstone within the Nirehara Formation suggests that the sandstone may be derived from the Nohi Rhyolite. Regional correlations of onshore and offshore Cenozoic chronostratigraphy in the Hokuriku district show multistage rifting during the Oligocene-middle Miocene opening of the Sea of Japan. Regional correlations also suggest that the post-rifting compressive regime was associated with fluctuations in the strength and direction of compressive stress fields.

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On the Microbiostratigraphy of the Yatsuo Group in the Yatsuo District of Toyama Prefecture

Cited by 2 publications

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

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

Revised Cenozoic chronostratigraphy and tectonics in the Yatsuo Area, Toyama Prefecture, central Japan

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On the Microbiostratigraphy of the Yatsuo Group in the Yatsuo District of Toyama Prefecture

Cited by 2 publications

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

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

Revised Cenozoic chronostratigraphy and tectonics in the Yatsuo Area, Toyama Prefecture, central Japan

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

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