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Nsp Tephra

Abbr.: Msp

• Tephra
• Pliocene (3.9 Ma, Diatoms)

• Lithofacies: Pumice

• Host: Kawazume Formation

• Distribution: Niigata pref.

• Nagamori et al. (2018) Geology of the Itoigawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 75p. (in Japanese with English abstract 3p.)