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Fig. 1 | Progress in Earth and Planetary Science

Fig. 1

From: Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications

Fig. 1

Location map of the study site and stratigraphic summary of the Awa Group. a The Japanese archipelago with surface oceanography and tectonic setting. Surface oceanic currents are drawn after Qiu (2001). Tectonic setting is drawn after Tatsumi et al. (2016). b Distribution of the Awa and Kazusa Groups on the Boso and Miura Peninsulas based on Mitsunashi and Suda (1980), Unozawa et al. (1983), Sakamoto et al. (1987), and Takeuchi et al. (2015). c Distribution of the upper Awa Group. The Anno, Kiyosumi, Amatsu, and Kinone Formations in the Futtsu District are based on Nakajima and Watanabe (2005). The dashed box indicates the study area. d Typical stratigraphies of the upper Awa Group and lowermost Kazusa Group in the western Boso Peninsula are based on Nakajima and Watanabe (2005), and detailed stratigraphies are based on previous studies marked with asterisks. Calcareous nannofossil assemblage zonal schemes follow the CN and NN zonal code notations after Okada and Bukry (1980) and Martini (1971), respectively. Planktonic foraminiferal assemblage zonal schemes follow the N zonal code notation after Blow (1969). *1 Nakajima and Watanabe (2005), *2 Niitsuma (1976), *3 Kameo and Sekine (2013), and *4 Oda (1977)

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