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Fig. 1 | Progress in Earth and Planetary Science

Fig. 1

From: Calcareous nannofossil biostratigraphy of the Lower–Middle Pleistocene boundary of the GSSP, Chiba composite section in the Kokumoto Formation, Kazusa Group, central Japan, and implications for sea-surface environmental changes

Fig. 1

Oceanographic conditions around the Japanese islands (a) and the location of the studied area (b). a Major surface currents around the Japanese islands based on Brown et al. (2001), Qiu (2001), and Yasuda (2003). Sea-surface temperature from the World Ocean Atlas 2013 (Locarnini et al. 2013) illustrated by Ocean Data View software (Schlitzer 2020). TSC: Tsushima Current, TGC: Tsugaru Current, KE: Kuroshio Extension. Detailed locations of the studied areas are shown in Fig. 2. b The generalized geological map of the Boso Peninsula is based on that created by Tokuhashi and Watanabe (2008). Stratigraphy in the Group distributed in the eastern part of the Peninsula is illustrated in Fig. 3

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