Machiya Member

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Machiya Member (Matsuda, 1961) Sugiyama and Matsuda, 2014

Type locality: Machiya, Nanbu city, Minamikoma county, Yamanashi prefecture
Coherent formation
late Miocene (Folaminifera)
Correlation: Utsubuna Member
Intruded by: Andesite dyke, Gabbro

Sedimentary facies: Marine
Lithofacies: Mudstone-dominant interbedded mudstone and sandstone
Lithofacies (Minor): Sandstone, Andesite tuff, Tuff breccia

Thickness: 700 m
Upper limit: Bottom of the dacite tuff bed
Upper limit: Conformity (Fukushi Member)
Lower limit: Conformity (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: Machiya - Kazone - Manzawa, Nanbu city, Minamikoma county, Yamanashi pref.
Fossils (Foraminifera): Globigerinoides bollii, Globoquadrina altispira, Globorotalia acostaensis, Globorotalia conoidea, Globorotalia plesiotumida, Orbulina universa, Pullenietina cf. primalis, 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.)