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Hotakizawa Formation

Synonym?: Hotakizawa Basalt Lava Member of Okuzu Formation

• Volcaic rocks
• Back-arc basin volcanism
• middle Miocene

• Sedimentary facies: Marine
• Depth of water: Deep sea
• Lithofacies (Upper): Mudstone
• Lithofacies (Lower): Basalt
• Lithofacies (Hotakizawa Basalt Lava Member): Basalt block lava, Basalt pillow lava, Pillow breccia, Hyaloclastite

• Thickness (Lower): 500 m or thicker
• Upper limit: Conformity
• Lower limit: Conformity

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

• Distribution: Hokuroku region, Akita pref.
• Distribution (Hotakizawa Basalt Lava Member): Kosaka city, Kazuno county, Akita pref.

• Yamada and Yoshida (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.168-179 DOI
• Mizuta and Ishiyama (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, p.181 DOI