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Yoroibata Formation

• Type locality: Mount Takabachi, Nishiki town, Senboku city, Akita prefecture
• Volcanic rocks
• Miocene - Pliocene

• Lithofacies (Top): Basalt lava
• Lithofacies: Rhyolitic volcaniclastic rocks

• Thickness: 220 - 330 m
• Thickness (Basalt): 80 - 150 m
• Thickness (Rhyolite): 180 - 230 m

• Upper limit: Unconformity (Miyata Formation)
• Lower limit: Unconformity (Omata Formation)

• Distribution: Mount Takabachi, Nishiki town, Senboku city, Akita pref.

• Ozawa and Sumi (1958) Tazawako, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 23p. (in Japanese with English abstract 4p.)