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Integrated Ocean Drilling Program Site C0002 is a key site in the Nankai Trough Seismogenic Zone Experiment for obtaining fundamental geologic information on the Kumano forearc basin and revealing tectonic activity around the Nankai Trough subduction zone. Many scientific drilling programs have been performed at this site. During Expedition 338, deep-sea cores, cuttings, and loggingwhile-drilling data were collected. This paper provides counting results for calcareous nannofossils in lower Pleistocene sediments from Holes C0002K and C0002L and revises nannofossil biohorizons previously recognized. Four calcareous nannofossil biohorizons in the Quaternary were detected in sediments from the two holes, and the investigated sequences can be assigned to about 1.24–1.04 Ma. Counts of subordinate calcareous nannofossil taxa were also performed to examine sea-surface environmental changes. Subtropical taxa including a Kuroshio water species were dominant throughout the section and occurred with irregular fluctuations in abundance. Introduction In 2012, Integrated Ocean Drilling Program Expedition 338, as part of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE), conducted a scientific drilling program at five sites around the edge of the Kumano Basin off Kii Peninsula in the middle part of the Pacific side of the Japanese islands (Figure F1). The sites drilled during this expedition were situated on the outer-arc high and the trench-slope basins near the Kumano forearc basin (Strasser et al., 2014). Among these, Site C0002 is a key site for clarifying the lithostratigraphy and chronostratigraphy of the sediments deposited in the Kumano forearc basin and for revealing the tectonic activity of Figure F1. Location map of sites drilled during Nankai Trough Seismogenic Zone Experiment expeditions (modified after Ashi et al., 2009; Strasser et al., 2014; and Tatsumi et al., 2016). Bathymetry was illustrated using Ocean Data View software (Schlitzer, 2020). 50 km 0 Kii Peninsula Site C0002 Exp. 338 sites Sites of previous expeditions Site C0009 Sites C0001, C0003, and C0004 Site C0021 Site C0018 Site C0022 Sites C0008 and C0010 Sites C0006 and C0007 Site C0011 Site C0012 Site C0002 35° N

proceedings of the integrated ocean drilling program. expedition reports/proceedings of the integrated ocean drilling program

Data report: calcareous nannofossil biostratigraphy of the lower Pleistocene in Holes C0002K and C0002L, IODP Expedition 338, Nankai Trough Seismogenic Zone Experiment