Shallow-Marine Ostracods from the Lower Pleistocene Kazusa Group in the Tama Hills, Central Japan, with Their Biogeographical Significance in the Northwest Pacific Ocean
Shallow-Marine Ostracods from the Lower Pleistocene Kazusa Group in the Tama Hills, Central Japan, with Their Biogeographical Significance in the Northwest Pacific Ocean
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日本中部多摩山下更新世 Kazusa 群的浅海介形类及其在西北太平洋的生物地理学意义
DOI：
10.2517/2014pr018
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发表时间：
2014
影响因子：
1.9
通讯作者：
T. Ishii
中科院分区：
文献类型：
--
作者：
Hirokazu Ozawa;T. Ishii
抽象的。
本研究调查了多摩山（约1000年）Kazusa群早更新世介形类动物群。沿着日本中部东京湾西侧，1.7-1.4 Ma）。本文首次报道了关东地区早更新世介形类动物群。该动物群由56种组成，Q型聚类分析确定了3个组合。其中以BS组合中的Bicornucytherebisanensis和Spinilecytherquadriaculeata、PB组合中的Pontocytherasubjaponica和Buntoniahanaii、LP组合中的Loxoconchaikeyai和Pontocytherasubjaponica的数量最多。这些组合指示了以下沉积环境：（1）低盐度的内湾最内至中部（2）内湾外围和陆架上部受盐度较高的开阔海水影响（3）内湾中央至外围区域，盐度介于（1）和（2）之间（组合PB）。我们还报告了第一次发生在太平洋一侧的日本东京湾附近的两个嗜冷类群，Laperousecythere robusta和Pectocythere sp. Laperousecythere robusta从日本海沿岸向南移动，可能通过津轻海峡到达日本中部东京湾附近的1.6 Ma。Pectocythere sp.可能最早出现在更新世早期的1.6 Ma。BS组合的物种含量表明，Bicornucythere和Spiniletrium最晚在1.6-1.4 Ma共同生活在东京湾附近的内湾地区。该化石动物群不包括Neomonoceratina和Sinocytheridea属的内湾物种。他们没有在东京湾附近的更新世早期是一致的，与以前的古生物地理学研究结果，日本湾居住介形类。这些数据提供了关于晚新生代期间西北太平洋边缘沿着浅海底栖生物向北或向南迁移的路线和时间的信息。
Abstract.
This study investigated an early Pleistocene ostracod fauna from the Kazusa Group in the Tama Hills (ca. 1.7-1.4 Ma) along the western side of Tokyo Bay, central Japan. We report for the first time an early Pleistocene ostracod fauna from the Kanto District. This fauna consists of 56 species, with three assemblages defined by Q-mode cluster analysis. The two most abundant species are Bicornucythere bisanensis and Spinileberis quadriaculeata in the assemblage BS, Pontocythere subjaponica and Buntonia hanaii in the assemblage PB, and Loxoconcha ikeyai and Pontocythere subjaponica in the assemblage LP. These assemblages indicate the following depositional environments: (1) the innermost to central area of an inner bay having relatively low salinity (assemblage BS); (2) the outer area of the inner bay and upper-shelf area influenced by open sea water with relatively high salinity (assemblage LP); and (3) the central to outer area of the inner bay having salinity intermediate between that of (1) and (2) (assemblage PB). We also report first occurrences on the Pacific side of Japan near Tokyo Bay for two cryophilic taxa, Laperousecythere robusta and Pectocythere sp. Laperousecythere robusta moved southward from the Japan Sea coast, probably through the Tsugaru Strait before reaching central Japan near Tokyo Bay by 1.6 Ma. Pectocythere sp. might have first appeared around Tokyo Bay during the early Pleistocene by 1.6 Ma. The species content of the assemblage BS suggests that Bicornucythere and Spinileberis commonly inhabited inner-bay areas near Tokyo Bay by 1.6-1.4 Ma at the latest. This fossil fauna does not include inner-bay species of the genera Neomonoceratina and Sinocytheridea. Their absence near Tokyo Bay in the early Pleistocene is consistent with previous palaeobiogeographical findings regarding Japanese bay-dwelling ostracods. These data provide information about the route and timing of the northward or southward migrations of shallow-marine benthos along the Northwest Pacific margin during the late Cenozoic.
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