Biogeographical and Biostratigraphical Significance of a New Middle Devonian Phacopid Trilobite from the Naidaijin Formation, Kurosegawa Terrane, Kyushu, Southwest Japan

Stocker, Christopher; Tanaka, Gengo; Siveter, Derek J.; Lane, P.D; Tsutsumi, Yukiyasu; Komatsu, Toshimitsu; Wallis, Simon; Oji, Tatsuo; Siveter, David J.; Williams, Mark

doi:10.2517/2017pr011

Cited by 4 publications

(13 citation statements)

References 24 publications

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“…They concluded that facies control would be important for considering the paleobiogeography. The ostracod assemblages from the Naidaijin Formation indicate shallower faunas which come from light gray tuffaceous limestone with many fossils, supporting the importance of facies control argued as Stocker et al (2018).…”

Section: Discussionsupporting

confidence: 66%

Middle Devonian ostracods from the Naidaijin Formation, Kurosegawa belt, Kyushu, Japan: Paleoecological and paleogeographical significance

Tanaka

2022

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This study reports five ostracod taxa from the Middle Devonian Naidaijin Formation, Kumamoto Prefecture, Kyushu, Japan comprising shelf‐nearshore beyrichiid and bairdiocypridoid species, and two species of Bairdia. This is the first report of ostracod fossils from the Devonian strata in the Kurosegawa belt. Most analyzed fossils are the same species as those found in the Middle Devonian strata of Yunnan and Guangxi provinces in South China, indicating that the Kurosegawa belt of Kyushu shared biogeographical affinities with the palaeo‐equatorial South China paleocontinent.

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Section: Discussionsupporting

confidence: 66%

Middle Devonian ostracods from the Naidaijin Formation, Kurosegawa belt, Kyushu, Japan: Paleoecological and paleogeographical significance

Tanaka

2022

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“…The Lower Member of the Devonian Naidaijin Formation of Kumamoto Prefecture, Kyushu is dated via a chain of correlation with trilobites of the Nakazato Formation (see above). Detrital zircons from a sandstone bed 2 m above the trilobite‐bearing horizon evaluated herein have yielded a radiometric age of (383.9 ±4.4) Ma that is likely Givetian (late Mid‐Devonian; Stocker et al, ).…”

Section: Stratigraphy Of the Trilobite‐bearing Formations Of Japanmentioning

confidence: 72%

“…Devonian phacopids of the KT and SKT of Japan (Kaneko, , ; Stocker et al, ) show strong generic links, and one species link with North China (Kaneko, , ; Zhou & Campbell, ). The sub‐family Echinophacopinae, including Toxophacops and Rhinophacops , are only found in the Zhusilenghaierhan region of Inner Mongolia, North China, and the KT and SKT of Japan.…”

Section: Paleobiogeographical Affinity Of Japanese Silurian and Devonmentioning

confidence: 99%

“…In the Middle Devonian phacopids and proetids of the Naidaijin Formation of the KT and the Nakazato Formation of the SKT of Japan (Kaneko, , ; Stocker et al, ) show species‐level links between these two terranes; the phacopid species Toxophacops ( Atopophacops ) nonakai , the proetid Dechenella minima , and the scutelluid Kobayashipeltis paucispinosa also occur in the Naidaijin and Nakazato Formations (Kaneko, ) of the KT and SKT terrane, respectively. Kobayashipeltis is endemic to these two Japanese terranes.…”

Section: Paleobiogeographical Affinity Of Japanese Silurian and Devonmentioning

confidence: 99%

“…Revision of Encrinuridae by Holloway (), Ramsköld (), Strusz (), and Zhang () suggests links between Australia, Japan, and South China. Additionally, revision of the Phacopidae by Kaneko (, ), Stocker et al (), and Zhou and Campbell () has demonstrated links between the KT and SKT as well as with the North China paleocontinent. However, a recent review of the Proetidae and Aulacopleuridae of Japan (Stocker et al, 2018), considered both of these groups to be endemic at the species level, even between the Japanese terranes, though proetids suggested links with North China at the genus‐level.…”

Section: Introductionmentioning

confidence: 99%

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The paleobiogeographical significance of the Silurian and Devonian trilobites of Japan

et al. 2019

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Six major groups of trilobites from the Silurian and Devonian of Japan are evaluated for their paleobiogeographical signature. Silurian illaenids and scutelluids show four generic‐level and at least two species‐level links with the Australian segment of the Gondwana paleocontinent; encrinurids also indicate two generic‐level links with Australia and also the South China paleocontinent; whilst Devonian phacopids, and possibly proetids, suggest at least two generic‐level links with the North China paleocontinent. These different patterns may reflect the fragmentary biostratigraphical record of Japanese trilobites, but they also appear to reflect paleoenvironmental parameters associated with lithofacies, and paleoecology. Thus, Japanese assemblages of proetids and phacopids occurring in deep‐water clastic lithofacies have counterparts in similar settings in North China, and Japanese scutelluids and illaenids are strongly associated with shallow marine carbonate lithofacies that are similar to those of their occurrences in Australia. Japanese encrinurids occur in carbonate rocks indicative of shallow marine settings in the Kurosegawa Terrane, and they demonstrate a consistent paleobiogeographical affinity with Australia and South China. Larval ecology cannot be directly assessed for Japanese trilobite groups. However, proetids have consistently been shown to have planktonic protaspides, whereas illaenids, scutelluids, and encrinurids have benthic protaspides. Planktonic protaspides would have a greater propensity for distribution in ocean currents than benthic ones, and therefore may be of more limited paleobiogeographical utility. The combined data from the six different groups indicates that the complex paleobiogeographical patterns of the Japanese trilobite assemblages need to be interpreted with caution, and similarity of taxa does not necessarily denote paleogeographical proximity to other regions.

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The Silurian and Devonian proetid and aulacopleurid trilobites of Japan and their palaeogeographical significance

Stocker¹,

Siveter²,

Lane³

et al. 2019

Fossils and Strata

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Biogeographical and Biostratigraphical Significance of a New Middle Devonian Phacopid Trilobite from the Naidaijin Formation, Kurosegawa Terrane, Kyushu, Southwest Japan

Cited by 4 publications

References 24 publications

Middle Devonian ostracods from the Naidaijin Formation, Kurosegawa belt, Kyushu, Japan: Paleoecological and paleogeographical significance

Middle Devonian ostracods from the Naidaijin Formation, Kurosegawa belt, Kyushu, Japan: Paleoecological and paleogeographical significance

The paleobiogeographical significance of the Silurian and Devonian trilobites of Japan

The Silurian and Devonian proetid and aulacopleurid trilobites of Japan and their palaeogeographical significance

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