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Progress in Earth and Planetary Science
Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: Basin-wide erosion and segmentation of the Plio-Pleistocene forearc basin in central Japan revealed by tephro- and biostratigraphy

Fig. 3

Distribution and outcrop occurrences of the Zushi Formation, the Jimmuji Member, and the upper part of the Ikego Formation. a Geologic map of the Hisagi and Ikego areas, Zushi City, showing the locations of the sketched outcrops reported by previous researchers, and the locations of the studied sites. Gray-colored strike and dip symbols are from Eto (1993). b Sketches of outcrops exposed by residential construction illustrate stratigraphic levels of the Nt and Ng tephra beds and the internal structure of the Jimmuji Member (after Eto 1993, and Yokohama Defense Facilities Administration Bureau 1993). c Route maps in the Ikego Forest Natural Park showing location of outcrops of the Zushi and Ikego formations. d Geologic columns along traverses Z1 and Z2 where the uppermost part of the Zushi Formation and the overlying Ikego Formation are exposed. Note that the Jimmuji Member becomes thinner and pinches out westward where a tens of cm-thick pebbly sandstone bed covers the erosional surface. The lithologic legend is shown in Fig. 4

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