Toishigawa Mudstone and Sandstone Member

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Toishigawa Mudstone and Sandstone Member

Type locality: Toishigawa river, Sanda city, Hyogo prefecture
Coherent formation
Eocene - Oligocene

Sedimentary facies: Meandering river, Lacustrine
Lithofacies: Interbedded mudstone and sandstone
Lithofacies (Minor): Tuffaceous siltstone, Sandstone, Conglomerate

Thickness: Several - 50 m
Upper limit: Conformity (Nitta Conglomerate Member)
Lower limit: Unconformity (Hiraki Welded Tuff, Kamogawa Formation, Sasori Tuff Breccia)

Sanda Formation
[ Upper ]
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Shimoisawa Mudstone Member
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Nitta Conglomerate Member
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Toishigawa Mudstone and Sandstone Member
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[ Lower ]

Kobe Group (Sanda, Hyogo pref.)
[ Upper ]
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Hosokawa Formation
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Yokawa Formation
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Sanda Formation
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[ Lower ]

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

Distribution: Toishigawa river - Okawase - Nishiaino - Mizoguchi - Sengari golf field, Sanda city, Hyogo pref.; Akitsu, Kato city, Hyogo pref.; Tamaru, Dojo town, Kobe city, Hyogo pref.

Matsuura et al. (1995) Geology of the Hirone District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 110p. (in Japanese with English abstract 6p.)
Ozaki and Matsuura (1988) Geology of the Sanda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)