Toshima Member

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Toshima Member

Coherent formation
late Miocene

Sedimentary facies: Marine
Lithofacies: Interbedded sandstone and mudstone

Lower limit: Conformity, partly Interfingered (Manzawa Member)

Manzawa Formation
[ Upper ]
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Fukushi Member
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Machiya Member
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Manzawa Member
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Toshima Member
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[ Lower ]

Fujikawa Group (Eastern zone)
[ Upper ]
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Manzawa Formation
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[ Lower ]

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

Distribution: Yamanashi pref.
Fossils (Foraminifera): Globigerina nepenthes, Globoquadrina dehiscens, Globorotalia menardii, Orbulina universa, Sphaeroidinellopsis seminulina

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.)
Sugiyama and Matsuda (2014) Geology of the Nanbu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 134p. (in Japanese with English abstract 5p.)