Shimobata Member

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Shimobata Member

Type locality: Shimobata - Omata, Yoshinaga town, Bizen city, Okayama prefecture
Volcanic rocks
Late Cretaceous

Sedimentary facies: Volcanic domes
Sedimentary facies (Minor): Pyroclastic flow deposits
Lithofacies: Rhyolite lava, Pyroclastic rocks
Sedimentary structures: Flow structures, Spherulitic structures

Thickness: ca. 20 - 200 m
Lower limit: Abut unconformity (Kaisaka Member)

Tsurukamekabu Formation
[ Upper ]
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Shimobata Member
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Kaisaka Member
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[ Lower ]

Aioi Group (Hyogo pref. - Okayama pref.)
[ Upper ]
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Ako Formation
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Tsurukamejobu Formation
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Tsurukamekabu Formation
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Kamigorijobu Formation
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Kamigorikabu Formation
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[ Lower ]

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

Distribution: Shimobata - Omata, Yoshinaga town, Bizen city, Okayama pref.; Une, Ako city, Hyogo pref.; Yano town, Aioi city, Hyogo pref.

Igi and Wadatsumi (1980) Geology of the Kamigori District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 4p.)