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Nekko Dacites

Invalid synonym: Saruyama Andesites

• Volcanic rocks
• Stratovolcano, Lava dome
• Pliocene
• Intruded by: Andesite

• Lithofacies (Andesite): Hypersthene series
• Lithofacies (Upper): Dacite lava
• Lithofacies (Middle): Andesite lava (A few flow units)
• Lithofacies (Middle, Minor): Volcanic conglomerate
• Lithofacies (Lower): Dacite lava
• Lithofacies (Botom): Tuff breccia-like hyaloclastite
• Lithofacies (Minor): Sandstone, Conglomerate, Siltstone

• Thickness: ca. 400 m
• Thickness (Upper): ca. 100 m
• Thickness (Middle): 150 - 200 m
• Thickness (Lower): ca. 100 m
• Lower limit: Unconformity (Yugashima Group, Nekko Green Andesitic Bed)

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

• Distribution: Nekko pass - Mount Gotoyama, Nishiizu city, Kamo county - Izu city, Shizuoka pref.; Mochikoshi mine, Izu city, Shizuoka pref.; Mount Saruyama, Kawazu city, Kamo county, Shizuoka pref.

• Sawamura et al. (1970) Geology of the Shimoda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 41p. (in Japanese with English abstract 4p.)
• Sawamura (1955) Shuzenji, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 47p. (in Japanese with English abstract 4p.)