Biogeographical and Biostratigraphical Significance of a New Middle Devonian Phacopid Trilobite from the Naidaijin Formation, Kurosegawa Terrane, Kyushu, Southwest Japan
Biogeographical and Biostratigraphical Significance of a New Middle Devonian Phacopid Trilobite from the Naidaijin Formation, Kurosegawa Terrane, Kyushu, Southwest Japan
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DOI：
10.2517/2017pr011
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发表时间：
2018-01
影响因子：
0.9
通讯作者：
C. Stocker;G. Tanaka;D. Siveter;P. Lane;Y. Tsutsumi;T. Komatsu;S. Wallis;T. Oji;D. Siveter;M. Williams
中科院分区：
文献类型：
--
作者：
C. Stocker;G. Tanaka;D. Siveter;P. Lane;Y. Tsutsumi;T. Komatsu;S. Wallis;T. Oji;D. Siveter;M. Williams
抽象的。新发现的三叶虫产于日本西南部黑濑川地体的内大阵组，属Toxophacops（Atopophacops）fujiwara sp. nov.，其年龄为383.9±4.4 Ma，可能为吉维特阶（中泥盆世晚期）。在其他地区，早泥盆世至中泥盆世的T.（Atopophacops）和T.（Toxophacops）在日本东北部南北上地体的中里组和中国内蒙古西部的珠斯楞海尔汗地区均有记录。新的三叶虫种扩展了刺囊螨亚科的地理范围，并支持了一些泥盆纪日本三叶虫与中国北方三叶虫的亲缘关系。Toxophacops在内岱金组下段的出现，结合其他三叶虫证据，证实了内岱金组下段（下泥盆统上部和中泥盆统）和上段（上泥盆统）之间明确的生物地层区分。
Abstract. A newly discovered trilobite from the Naidaijin Formation in the Kurosegawa Terrane of southwest Japan is referred to Toxophacops (Atopophacops) fujiwara sp. nov. The trilobite occurs in strata 2 m below a level with detrital zircons that yield an age of 383.9±4.4 Ma that is likely Givetian (late Mid-Devonian). Elsewhere, Early to Mid-Devonian trilobite species of T. (Atopophacops) and T. (Toxophacops) have been recorded from the Nakazato Formation of the South Kitakami Terrane of northeast Japan, and from the Zhusilenghaierhan region of western Inner Mongolia, North China. The new trilobite species extends the geographical range of the phacopid subfamily Echinophacopinae, and supports the affinities of some Devonian Japanese trilobites with those of north China. The occurrence of Toxophacops in the Lower Member of the Naidaijin Formation, combined with other trilobite evidence, confirms a clear biostratigraphical distinction between the Lower Member (upper Lower and Middle Devonian) and Upper Member (Upper Devonian) of the Naidaijin Formation.