Yogosawa Conglomerate Member

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Yogosawa Conglomerate Member (Akiyama, 1957) Ozaki and Sugiyama, 2018

Invalid synonym: Akebono Conglomerate

Type locality: Yogosawa river, Kawadaira, Yogosawa, Minobu city, Minamikoma county, Yamanashi prefecture
Coherent formation
Pliocene - early Pleistocene
Contemporaneous heterotopic facies (Basal part): Kawadaira Mudstone Member

Sedimentary facies: Marine
Lithofacies: Conglomerate
Lithofacies (Minor): Sandstone, Mudstone, Dacite tuff
Sedimentary structures: Imbrication
Paleocurrent: East - Southeast (Imbrication)

Thickness: ca. 350 - 3,700 m or thicker
Lower limit: Conformity (Teuchizawa Breccia Member, Kawadaira Mudstone Member, Osozawa Sandstone Member), Unconformity (Tsukimibashi Volcaniclastic 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 - Nakayama - Ejirikubo - Furuhase - Yazaiku - Hirasu - Kunari - Hinataminamizawa - Oshio - Odafunahara - Aimata, Minobu city, Minamikoma county, Yamanashi pref.; Yanagawa, Fujikawa city, Minamikoma county, Yamanashi pref.
Fossils: Gymnosomata
Fossils (Shellfishes): Chlamys satoi, Glycymeris cisshuensis, Paphia exilis exilis
Fossils (Foraminifera): Globorotalia crassaformis, Globorotalia inflata, Globorotalia tosaensis, Neogloboquadrina asanoi, Neogloboquadrina detertrei, Sphaeroidinella dehiscens

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.)