Shimoisawa Mudstone Member

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Shimoisawa Mudstone Member

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

Sedimentary facies: Lacustrine
Lithofacies: Mudstone
Lithofacies (Minor): Sandstone, Lignite

Thickness: 10 - 50 m
Upper limit: Bottom of the horizon including thick sandstone and conglomerate beds
Upper limit: Conformity, partly Transitional (Nagao Sandstone and Mudstone Member)
Lower limit: Conformity (Nitta Conglomerate Member)

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: Shimoisawa - Mukogaoka - Sawadani, Sanda city, Hyogo pref.; Maeda, Yokawa town, Miki city, Hyogo pref.; Eibara, Nagao town, Kobe city, Hyogo pref.; Shimoyamaguchi, Yamaguchi town, Nishinomiya city, Hyogo pref.

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.)