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Towada Hachinohe Fall Tephra (Oike, 1959) Kudo, 2005

Abbr.: HP

Synonym (Invalid): Hachinohe Pumice Fall Deposit, Hachinohe Volcanic Ash Member

• Type locality: Nakayashiki, Towada city, Aomori prefecture
• Tephra
• Pleistocene (14 - 12 ka BP, ¹⁴C, 15.3 - 14.9 ka, ¹⁴O)
• Winter season

• Lithofacies (HP6): Pumice fall deposit
• Lithofacies (HP5): Volcanic ash
• Lithofacies (HP5, Minor): Accretionary lapilli
• Lithofacies (HP4): Pumice fall deposit
• Lithofacies (HP3): Volcanic ash
• Lithofacies (HP3, Minor): Accretionary lapilli
• Lithofacies (HP2): Pumice fall deposit
• Lithofacies (HP1): Volcanic ash
• Lithofacies (HP1, Minor): Accretionary lapilli

• Source: Towada caldera
• Mode of eruption: Phreatic Plinian
• Thickness: 37 - 65 cm
• Upper limit: Unconformity (Maisawa Terrace Deposit)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Kamikita plain, Aomori pref., Japan
• Distribution: Nakayashiki, Towada city, Aomori pref.; Fukuoka terrace, Ichinohe city, Ninohe county, Iwate pref.; Odaira, Saihoji, Ichinohe city, Ninohe county, Iwate pref.; Hayawatari, Karumai city, Kunohe county, Iwate pref.; Kokarumai, Karumai city, Kunohe county, Iwate pref.; Nukari, Hirono city, Kunohe county, Iwate pref.

• Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)
• Kudo (2005) Geology of the Towada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)
• Yoshida et al. (1987) Geology of the Rikuchu-Ono District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)