Fig. 4

Comparisons among paleoceanographic proxies: a Oxygen isotope record (δ¹⁸O) of planktonic and benthic foraminifera (Haneda et al. 2020). Pale blue indicates the range of values for Globigerina bulloides (δ¹⁸O_Gb, upper limit) and Globorotalia inflata (δ¹⁸O_Gi, lower limit) from the Yoro River and Yoro-Tabuchi sections. Dark blue solid line indicates average of δ¹⁸O_Gb and δ¹⁸O_Gi. Dashed lines with solid circles and × symbols indicate δ¹⁸O_Gb and δ¹⁸O_Gi from the Kokusabata, Yanagawa and Urajiro sections, and the dark-blue dashed line without dots shows their average. b Variations of the Tr index. Pale red line indicates original plots, and their three-point moving average is shown as a red line for the high-resolution interval. c Total radiolarian abundance changes. Yellow line shows the original plots and the dark line indicates moving average over three points. Gray bands indicate intervals of multiple maxima of the Tr curve for the high-resolution interval