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IS-1 Tephra, Moriya et al., 2008

Abbr.: IS-1

• Type locality: Shinjo basin, Yamagata prefecture
• Tephra
• Pleistocene (3.9 Ma, FT)

• Lithofacies: Pumiceous tuff
• Sedimentary structures (Upper): Parallel stratification, Cross stratification

• Thickness: 1.5 - 3 m
• Host: Sakekawa Formation

• Distribution: Shinjo basin, Yamagata pref.

• Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.1, pp.1-15 DOI