[ Top ] [ Japanese ]

Konosuyama Formation (Masuda, 1954) Yoshikawa, 2002

Invalid synonym: Anamizu Formation, Shirasakayama Andesite, Kakuma Andesite, Kakuma Volcanic Rocks

• Type locality: Mount Koshuzan, Wajima city, Ishikawa prefecture
• Volcanic rocks
• Oligocene (29 Ma or earlier)
• Intruded by: Shinobu Diorite, Orthopyroxene clinopyroxene andesite dikes, Olivine clinopyroxene orthopyroxene basalt - andesite dikes

• Sedimentary facies: Terrestrial
• Lithofacies (Top): Conglomerate
• Lithofacies: Orthopyroxene clinopyroxene andesite lava, Olivine clinopyroxene orthopyroxene basalt - andesite lava
• Lithofacies (Minor): Conglomerate, Tuffaceous sandstone, Volcanic breccia, Lapilli tuff, Tuff breccia, Dacite - Andesite pyroclastic rocks

• Thickness: 1,200 m or thicker
• Upper limit: Unconformity (Goroku Formation, Matsunagi Formation, Kamiwazumi Formation, Horyuzan Formation)

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

• Distribution: Mount Koshuzan, Wajima city, Ishikawa pref.; Nakasai - Tome - Uchiura, Noto city, Hosu county, Ishikawa pref.
• Fossils: Pollen

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Yoshikawa et al. (2002) Geology of the Suzumisaki, Noto-iida and Horyuzan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 4p.)