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Honjohama Andesite

• Volcanic rocks
• Pliocene
• Intruded in: Yosa Group

• Lithofacies: Hypersthene augite andesite lava, Hyaloclastite, Agglomerate
• Structures: Pseudo-pillow, Platy joint, Columnar joint

• Thickness: ca. 70 - 170 m
• Upper limit: Unconformity (Komoriyama Andesite)
• Lower limit: Unconformity (Yosa Group)

• Distribution: Honjohama - Honjouji - Tsumo - Kameshima, Ine city, Yosa county, Kyoto pref.; Kanmurijima island - Kutsujima island, Maizuru city, Kyoto pref.

• Hirokawa and Kuroda (1962) Kammuri-Jima, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 12p. (in Japanese with English abstract 6p.)
• Hirokawa and Kuroda (1958) Tangoyura, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 23p. (in Japanese with English abstract 9p.)