Kawadaira Mudstone Member

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Kawadaira Mudstone Member (Akiyama, 1957) Ozaki and Sugiyama, 2018

Invalid synonym: Kawadaira Formation

Type locality: Yogosawa river, Kawadaira, Yogosawa, Minobu city, Minamikoma county, Yamanashi prefecture
Coherent formation
late Miocene - early Pliocene
Contemporaneous heterotopic facies: basal part of Yogosawa Conglomerate Member

Sedimentary facies: Marine
Lithofacies: Siltstone
Lithofacies (Minor): Sandstone, Conglomerate, Mudstone

Thickness: ca. 170 - 400 m
Upper limit: Conformity (Yogosawa Conglomerate Member)
Lower limit: Conformity (Osozawa Sandstone Member)

Akebono Formation
[ Upper ]
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Yogosawa Conglomerate Member
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Kawadaira Mudstone Member
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Osozawa Sandstone Member
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Teuchizawa Breccia Member
~~~~~~~~~~~~~~
[ Lower ]

Fujikawa Group (Central zone)
[ Upper ]
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Hamaishidake Formation / Akebono Formation
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Aimata Formation
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Kuonji Formation
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Hara Formation
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[ Lower ]

Fujikawa Group (Eastern zone)
[ Upper ]
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Akebono Formation
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Minobu Formation
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Shimobe Formation
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[ Lower ]

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

Distribution: Yogosawa - Oharajima - Osozawa - Ushiroyama - Terasawa, Minobu city, Minamikoma county, Yamanashi pref.
Fossils: Gymnosomata
Fossils (Shellfishes): Amussiopecten praesignis, Glycymeris cisshuensis
Fossils (Foraminifera): Globorotalia tosaensis, Pulleniatina primalis

Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)