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Asamatoge Sandstone and Mudstone Member (Kosaka and Yamagishi, 1988) Yamada et al., 2004
Invalid synonym: Asamatoge Sandstone and Mudstone Facies, Shirayasawa Sandstone and Mudstone Member, Shirayasawa Sandstone and Mudstone Facies, Iriyama Sandstone Member, Iriyama Sandstone Facies
- Type locality: Funegasawa creek, Matsumoto city, Nagano prefecture
- Coherent formation
- middle Miocene
- Contemporaneous heterotopic facies: Takenoyu Volcanics Member
- Depth of water: 200 - 400 m (Shellfishes)
- Lithofacies (Upper): Sandy mudstone
- Lithofacies (Middle): Mudstone-dominant interbedded sandstone and mudstone
- Lithofacies (Lower): Interbedded sandstone and mudstone
- Lithofacies (Minor): Felsic tuff
- Sedimentary structures: Paralle stratification, Cross stratification, Sole marks
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Asamatoge pass - Inagura - Funegasawa creek - Nakanosawa creek - Hirokawarasawa creek, Matsumoto city, Nagano pref.; Kakeyu hotspring, Ueda city, Nagano pref.
- Fossils: Shellfishes (Propeamussium cf. transnipponica), Trace fossils
- Fossils (Foraminifera): Cyclammina sp., Dentoglobigerina altispira altispira, Globigerina angustiumbilicata, Globigerina bulloides, Globigerina druryi, Globigerina eamesi, Globigerina falconensis, Globigerina praebulloides, Globigerinella obesa, Globigerinita glutinata, Globorotalia archeomanardii, Globorotalia panda, Globorotalia praescitula, Globorotalia scitula, Globoquadrina dehiscens, Globoquadrina baroemoensis, Globoquadrina venezuelana, Orbulina bilobata, Sphaeroidinellopsis disjuncta, Sphaeroidinellopsis seminulina
- Kosaka et al. (2022) Earth Science (Chikyu Kagaku), vol.76, no.4, pp.179-194 DOI
- Harayama et al. (2009) Geology of the Matsumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 3p.)