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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 dike, 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)
------ 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.)