H7 Rhyolite Member

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H7 Rhyolite Member

Invalid synonym: middle Haigamine Formation

Type locality: Mount Haigamine - Nikyukyo valley, Kure city, Hiroshima prefecture
Volcanic rocks
Late Cretaceous
Correlation: Kanashi Formation, Onagobata Formation, Kazahaya Formation, Taromizu Formation, Komatsubara Formation

Lithofacies: Rhyolite welded vitreous crystalline lapilli tuff
Lithofacies (Minor): Dacite welded tuff, Tuffaceous sandstone, Mudstone
Structures: Eutaxitic structure

Thickness: 300 - 500 m
Distribution (East - West): ca. 20 km
Upper limit: Conformity (H8 Dacite Member), Abut unconformity (Norosan Welded Tuff)
Lower limit: Conformity (H6 Dacite Member)

Haigamine Formation
[ Upper ]
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H8 Dacite Member
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H7 Rhyolite Member
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H6 Dacite Member
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H5 Rhyolite Member
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H4 Dacite Member
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H3 Andesite Member
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H2 Rhyolite Member
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H1 Breccia Member
~~~~~~~~~~~~~~
[ Lower ]

Takada Rhyolites (Kure, Hiroshima pref.)
[ Upper ]
~~~~~~~~~~~~~~
Norosan Welded Tuff
~~~~~~~~~~~~~~
Haigamine Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Kazahaya - Komatsubara - Oshibajima island, Akitsu, Higashihiroshima city, Hiroshima pref.; Mount Haigamine, Kure city, Hiroshima pref.

Matsuura (2001) Geology of the Mitsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 58p. (in Japanese with English abstract 4p.)
Higashimoto et al. (1985) Geology of the Kure District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 6p.)