Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40623-017-0627-1/MediaObjects/40623_2017_627_Fig2_HTML.gif)
Detailed stratigraphic correlations between the Yanagawa, Yoro-River, Yoro-Tabuchi, and Kokusabata sections. The stratigraphic correlations are based on lithological changes and marker tephra beds. The samples for paleomagnetic (thin horizontal bars) and oxygen isotope analyses (light blue squares) are from the Yoro-River and the Yoro-Tabuchi sections in this study. The sample horizons shown on the Yanagawa and Kokusabata sections and the “TBH” series for the paleomagnetic studies on the Yoro-River section were used by Suganuma et al. (2015)