Additional file 2 of Matuyama–Brunhes geomagnetic reversal record and associated key tephra layers in Boso Peninsula: extraction of primary magnetization of geomagnetic fields from mixed magnetic minerals of depositional, diagenesis, and weathering processes

Additional file 2: Figure S2. (a) Schematic columnar section of Kazusa Group. Key tephras, magnetostratigraphy, biostratigraphy, marine isotope stages (MIS) stratigraphy, sequence stratigraphy, ages of tephras based on radiometric datings and correlations are shown. Base of Kazusa Group is suggested as 2.3 Ma based on tephrastratigraphy (Tamura et al., 2019). (b) Schematic lithology column of the Kokumoto Formation. Key tephras, magnetostratigraphy, and biostratigraphy are also shown. Red bar shows massive mudstone used for this study. Magnetozones in the magnetostratigraphy column in a are based on Niitsuma (1976). Geomagnetic reversal ages of the boundaries of Chrons and Subchrons are based on Gradstein et al. (2020) except for Reunion Subchron. Ages for the upper and lower boundaries of Reunion Subchron are based on Simon et al. (2018).