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Bandai-Hayama 1 Pyroclastid Flow Deposit Yamamoto and Sudo, 1996

Abbr.: Bn-HP1

Invalid synonyms: HP1, HP1b

• Type locality: Sarashina, Bandai city, Yama county, Fukushima prefecture
• Tephra
• Pleistocene (46 cal ka, AMS)
• Interfingered: Okinajima Debris Avalanche Deposit

• Sedimentary facies: associated with St. Helens-type collapse
• Lithofacies: Pyroclastic flow deposit
• Lithofacies: Orthopyroxene clinopyroxene dacite
• Lithofacies: Pumiceous lapilli

• Source: Bandai volcano
• Host: Higher II Terrace Deposit (Kawamata), Middle Terrace Deposit (Kawamata)
• Mode of eruption: Plinian
• Eruptive volume: ca. 0.2 km³
• Thickness: 5 cm - 4 m

• Distribution: Sarashina, Bandai city, Yama county, Fukushima pref.; Koriyama city, Fukushima pref.

• Yamamoto et al. (2006) Geology of the Kitakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 5p.)