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SW1 Tephra (Niitsuma, 1976) Tamura et al., 2019

Abbr.: SW1

Invalid synonym: SW

• Type locality: Sawakura, Katsuura city, Chiba prefecture
• Tephra
• Pleistocene

• Lithofacies: Tuff

• Host: Katsuura Formation
• Thickness: 5 - 10 cm

• Distribution: Sawakura, Katsuura city, Chiba pref.

• Tamura et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.23-39 DOI