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Ij-MO Tephra (Akutsu, 1957) Yamamoto, 2007

Abbr.: Ij-MO

Invalid synonym: Mooka Pumice, MoP

• Type locality: East cliff of Mookahokuryo high school, Shimokomoriya, Mooka city, Tochigi prefecture
• Tephra
• Pleistocene (0.23 - 0.22 Ma, Radiometric dating)
• Correlation: Echigoyuzawa Pyroclastic Flow Deposit

• Lithofacies: Cummingtonite-bearing orthopyroxene hornblende dacite
• Lithofacies: Lapilli

• Source: Iiji volcano
• Mode of eruption: Plinian
• Host: Hoshakuji Loam
• Thickness: 102 cm

• Distribution: Shimokomoriya, Mooka city, Tochigi pref.; Mamiana town - Kamikake, Utsunomiya city, Tochigi pref.; Hoshakuji, Takanezawa city, Shioya county, Tochigi pref.; Yamashita, Iwase, Sakuragawa city, Ibaraki pref.

• Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)
• Miyazaki et al. (1996) Geology of the Makabe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 4p.)