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Koshikiyama Dacite Ozawa et al., 1979

• Type locality: Mount Koshiki, Yurihonjo city, Akita prefecture - Mamurogawa city, Yamagata prefecture
• Volcanic rocks
• Miocene
• Intruded in: Onnagawa Formation

• Sedimentary facies: Lava dome
• Lithofacies: Hornblende dacite lava

• Distribution: Mount Koshiki, Yurihonjo city, Akita pref. - Mamurogawa city, Yamagata pref.

• Ozawa et al. (1979) Geology of the Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 64p. (in Japanese with English abstract 4p.)