Joshita Sandstone and Conglomerate Member

[ Top ] [ Japanese ]

Joshita Member (Yagi and Yagi, 1958) Kato et al., 1989

Invalid synonym: Joshita Sandstone and Conglomerate Member, Ikari Sandstone Member

Type locality: Joshita, Shinshushinmachi town - Sasadaira, Naniai, Nagano city, Nagano prefecture
Coherent formation
Pliocene
Contemporaneous heterotopic facies: Arakura Formation, Takafu Formation
Correlation: Sarumaru Formation
Intruded by: Porphyrite

Sedimentary facies: Shallow marine
Lithofacies (Upper): Conglomerate
Lithofacies (Lower): Sandstone
Lithofacies (Minor): Lignite

Thickness: 0 - 1,000 m
Upper limit: Unconformity (Akada Formation, Ooka Mudflow Deposit)
Lower limit: Bottom of the horizon containing plenty of sands of volcanic origin
Lower limit: Conformity (Okubo Mudstone and Sandstone Member, Nagaiwa Member)

Joshita Member
[ Upper ]
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Kumeji Pyroclastics Member
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[ Lower ]

(Invalid name) Shigarami Formation (Togakushi, Nagano pref.)
[ Upper ]
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Ogikubo Sandy Mudstone Member
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Arakurayama Pyroclastic Member
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Takafu Mudstone Member
'''''''/,,,,,,
Gonda Sandstone Conglomerate Member
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[ Lower ]

(Invalid name) Shigarami Formation (Nagano, Nagano pref.)
[ Upper ]
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Ogikubo Sandy Mudstone Member
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Arakurayama Pyroclastic Member / Hirose Mudstone Member / Joshita Member
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Okubo Mudstone and Sandstone Member
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[ Lower ]

(Invalid name) Shigarami Formation (Komiji, Nagano pref.)
[ Upper ]
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Joshita Member
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Nagaiwa Member
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[ Lower ]

(Invalid name) Shigarami Formation (Hikage, Nagano pref.)
[ Upper ]
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Tanogashira Member
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Idoirisawa Member
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Hiratokosawa Member
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[ Lower ]

Hokushin Group
[ Upper ]
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Shigarami Formation
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Ogawa Formation
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Aoki Formation
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[ Lower ]

northern Nagano pref.
[ Upper ]
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Hokushin Group
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Chushin Group
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[ Lower ]

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

Distribution: Joshita - Dojiri river - Takebusa, Shinshushinmachi town - Sasadaira, Naniai, Nagano city, Nagano pref.; Sasadaira - Shinmachi - Saikawa river, Naniai, Nagano city, Nagano pref.; Ko - Hijirigawasawa creek, Ooka, Nagano city, Nagano pref.
Fossils: Elephants (Stegolophodon shinshuensis)
Fossils (Echinoids): Echinarachnius naganoensis, Linthia nipponica
Fossils (Shellfishes): Anadara amicula, Ancistrolepis fragilis, Cardium ciliatum, Clinocardium ciliatum, Conchocele nipponica, Dosinia japonica, Troscheli, Glycymeris minochiensis, Glycymeris yamasakii, Lucinoma acutilineata, Lunatia sp., Mactra sp., Mercenaria chitaniana, Mya donaciformis, Natica sp., Neptunea modesta, Ostrea gigas, Patinopecten yamasakii, Patinopecten yessoensis, Saxidomus purpuratus, Spisula sachalinensis, Suavodrillia? sp., Turritella saishuensis

Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)
Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)