Takayama Volcanic Rocks

Takayama Volcanic Rocks Yoshida, 1961

Type locality: Hiuchidani valley, Takayama, Misato city, Ochi county, Shimane prefecture
Volcanic rocks
Eocene (47 Ma, FT)
Intruded by: Ijimi Granite, Rhyolite dikes, Dacite dikes, Porphyrite dikes, Granophyre dikes, Quartz porphyry dikes

Sedimentary facies: Subaqueous
Lithofacies (Upper): Dacite - Rhyolite tuff breccia, Tuff
Lithofacies (Upper, Minor): Lava, Tuffaceous shale, Rhyolite lapilli tuff, Tuff
Lithofacies (Middle): Andesite - Basalt hyaloclastitite, Tuff breccia, Tuff
Lithofacies (Lower): Conglomerate, Dacite tuff breccia, Lapilli tuff, Tuff
Lithofacies (Lower, Minor): Dacite lava
Lithofacies (Minor): Rhyolite pyroclastic rocks, Tuffaceous shale

Source: Motoyama, Shimane pref.
Thickness: 500 m or thicker
Distribution (Takayama region, East - West): 3 km
Distribution (Takayama region, South - North): 2 km
Distribution (Mukaitani region, East - West): 1.5 km
Distribution (Mukaitani region, South - North): 2.5 km
Upper limit: Unconformity (Toburodani Formation)
Lower limit: Unconformity (Onbara Granite, Ochi Group)

Takayama Group
[ North ]
~~~~~~~~~~~~~~
Hakami Volcanic Rocks
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Yugakaigawa Volcanic Rocks
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Tsuremizu Volcanic Rocks
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Takayama Volcanic Rocks
~~~~~~~~~~~~~~
[ South ]

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

Distribution: Takayama - Hamahara - Mukaitani - Jitosho, Misato city, Ochi county, Shimane pref.

Hattori et al. (1983) Geology of the Sambesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 168p. (in Japanese with English abstract 7p.)