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Progress in Earth and Planetary Science
Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

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. 7

Age plots of sea-surface proxy taxa of calcareous nannofossils along the Pacific side of the Japanese islands. Inferred surface environments are based on calcareous nannofossil thanatocoenosis distributions by Tanaka (1991). The Tn value, a calcareous nannofossil temperature index, is also shown. For comparison with floral data, oxygen isotope data of the CbCS (Okada et al. 2017; Suganuma et al. 2018; Haneda et al. 2020) and Tr values of radiolarian fossils (Suganuma et al. 2018) are also shown. Thin and thick lines of oxygen isotopes are measured data and 1000 year moving averages, respectively (Haneda et al. 2020). Purple arrows indicate cold horizons. Light-blue hatches are comparatively cold intervals

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