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Progress in Earth and Planetary Science
Fig. 5 | Progress in Earth and Planetary Science

Fig. 5

From: Spatial and temporal variations in depositional systems in the Kazusa Group: insights into the origins of deep-water massive sandstones in a Pleistocene forearc basin on the Boso Peninsula, Japan

Fig. 5

a Stratigraphic cross-section of the Chonan and Mandano formations. Modified from Ito (1992) and Ito et al. (2006a). SB14–SB16 are sequence boundaries defined by Ito and Katsura (1992). See Fig. S1 for the stratigraphic positions of SB14–SB16 within the Kazusa Group. The coding of tephra key beds, such as Ch1–Ch3 and Ks22–Ks10, is given on the left side of sections. Thin red lines indicate the correlation of the tephra key beds, and those with single arrows show onlap or toplap terminations of time lines. Solid red lines indicate sequence boundaries. b Tentative correlation of the timing of falling-stage deposition (a–d in a) and some tephra key beds with the oxygen isotopic sea-level index of Bassinot et al. (1994). Thin red horizontal lines in Ch2 and Ks11 indicate error bars for the numerical ages of these tephra key beds described in the text. The inset map shows the locations of the measured sections

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