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doi:10.2204/iodp.proc.346.201.2017

Introduction

Previously, Pliocene and Pleistocene ostracods from the marginal sea were investigated using specimens from mainly outcrops exposed in the marginal sea side of the Japanese Islands. Most of these studies examined shallow-marine ostracods from the Setana (Hayashi, 1988), Omma (Ozawa and Kamiya, 2001, 2005), Yabuta (Cronin et al., 1994), Mita (Goto et al., 2014b), Shichiba (Ozawa, 2010; Ishida et al., 2012), and Sasaoka (Irizuki, 1989; Yamada et al., 2002) formations. A few deep-sea ostracod faunas were recognized in the Kuwae (Yamada et al., 2005; Irizuki et al., 2007; Goto et al., 2014a) and Tentokuji (Irizuki, 1996; Irizuki and Ishida, 2007) formations (Fig. F1, Table T1). The deep-sea faunas contain the taxa that dwell in today’s Japan Sea Intermediate-Proper Water. Further, the faunas were reported from strata whose geological age is between 3.5 and 2.7 Ma.

In 2014, Integrated Ocean Drilling Program (IODP) Expedition 346 cored 7 sites in the marginal sea and 2 sites in the South China Sea (Fig. F1). At IODP Site U1426, four holes were cored at 903 meters below sea level (mbsl). Here, we report on the ostracod taxa found in Pliocene to Pleistocene sediments and describe them taxonomically. Following the shipboard age model (see the “Site U1426” chapter [Tada et al., 2015]), the geological age of the sediment samples ranges from 4.8 to 1.2 Ma.

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