Kasadani Formation

[ Top ] [ Japanese ]

Kasadani Formation Harayama, 1990

Type locality: Kasadani valley - Kuriyadani valley, Okuhidaonsengo, Takayama city, Gifu prefecture
Volcanic rocks
Late Cretaceous (ca. 63 Ma, Rb-Sr)

Sedimentary facies (Upper): Lava dome
Sedimentary facies (Bottom): Subaqueous
Lithofacies (Upper): Rhyolite lava
Lithofacies (Middle): Rhyolite welded tuff
Lithofacies (Lower): Rhyolite lava
Lithofacies (Bottom): Rhyolite tuffaceous sandstone, Tuffaceous mudstone, Lapilli tuff, Tuff breccia, Conglomerate
Lithofacies (Bottom, Minor): Andesite - Dacite tuff, Accretionary lapilli tuff
Sedimentary structures (Bottom): Parallel stratification

Thickness (Upper): 700 - 800 m
Thickness (MIddle): 0 - 100 m
Thickness (Lower): 0 - 400 m or thicker
Thickness (Bottom): 40 - 230 m
Upper limit: Conformity (Anagedani Formation, Nakasaki Tuff Member)
Lower limit: Conformity (Nakao Formation), Unconformity (Kanakido Tonalite)

Kasadani Formation
[ Upper ]
--------------
Upper lava
--------------
Kuriyadani Welded Tuff Member
--------------
Lower lava
'''''''/,,,,,,
Yarimi Tuff Member
--------------
[ Lower ]

Kasagatake Rhyolites
[ Upper ]
~~~~~~~~~~~~~~
Kasagatakesancho Welded Tuff
--------------
Anagedani Formation
--------------
Kasadani Formation
--------------
Nakao Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Kasadani valley - Kuriyadani valley - Uchikomidani valley - Shinhotaka - Kamata - Okibanotsuji - Mount Shakujodake - Shimosadani valley - Oguradani valley, Okuhidaonsengo, Takayama city, Gifu pref.

Harayama et al. (1991) Geology of the Yarigatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 190p. (in Japanese with English abstract 8p.)
Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)