Matsukasa Volcanic Rocks

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Matsukasa Volcanic Rocks Sawada, 1978

Type locality: Matsukasa - Yatani, Kakeya town, Unnan city, Shimane prefecture
Volcanic rocks
early Miocene
Intruded by: Granodiorite porphyry dikes

Lithofacies: Pyroxene andesite lava Volcanic breccia, Tuff breccia
Lithofacies (Minor): Rhyolite lava, Tuff, Dacite pyroclastic rocks

Thickness: 150 m or thicker
Upper limit: Unconformity (Teradani Andesite, Karakuri Dacite)
Lower limit: Transitional (Nari Clastic Rocks)

Hata Formation (Hata, Shimane pref.)
[ Upper ]
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Matsukasa Volcanic Rocks
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Nari Clastic Rocks
~~~~~~~~~~~~~~
[ Lower ]

southern Izumo, Shimane pref.
[ Upper ]
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Jinzai Formation
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Hikawa Formation
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Fujina Formation
-------~~~~~~~
Omori Formation
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Kuri Formation
'''''''/,,,,,,
Kawai Formation
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Hata Formation
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Sada Formation
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[ Lower ]

Kakeya caldera
[ Upper ]
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Hata Formation
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[ Lower ]

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

Distribution: Matsukasa - Yatani - Hata, Kakeya town, Unnan city, 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.)