Tuff Breccia Member

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Tuff Breccia Member Ishii et al., 1982

Invalid synonym: Katsugigaura Pyroclastic Rocks

Type locality: Miyato island, Higashimatsushima city, Miyagi prefecture
Volcanic rocks
Miocene

Sedimentary facies: Marine
Lithofacies: Tuff breccia, Volcanic breccia, Lapilli tuff
Lithofacies (Minor): Siltstone, Tuffaceous sandstone

Thickness: ca. 20 - 60 m
Upper limit: Conformity (Siltstone Member)
Lower limit: Conformity (Middle Pumice Tuff Member)

Matsushima Formation
[ Upper ]
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Upper Pumice Tuff Member
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Siltstone Member
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Tuff Breccia Member
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Middle Pumice Tuff Member
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Lower Pumice Tuff Member
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[ Lower ]

Matsushimawan Group
[ Upper ]
~~~~~~~~~~~~~~
Otsuka Formation
-------'''/,,,
Toguhama Formation
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Matsushima Formation
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Ajiri Formation
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Sauramachi Formation
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Shiogama Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Miyato island, Higashimatsushima city, Miyagi pref.; Fukuura island - Takagi river, Matsushima city, Miyagi county, Miyagi pref.

Ishii et al. (1982) Geology of the Matsushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 121p. (in Japanese with English abstract 9p.)