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Aosawa Formation Kujiraoka, 1953
Invalid synonym: Nakanomatagawa Formation, Aosawa Basaltic Tuff Breccia Member, Nishikawa Andesitic Tuff Breccia Member
- Sedimentary facies: Marine
- Metamorphic facies: Prehnite-Pumpellyite
- Water temperature: Warm (Foraminifera)
- Depth of water: Continental margin - Middle bathyal (Foraminifera)
- Lithofacies (Top): Mudstone, Acidic tuff
- Lithofacies: Olivine basalt, Olivine augite basalt lava (Pillow lava), Volcanic breccia (Hyaloclastite), Lapilli tuf, Tuff, Tuff breccia
- Lithofacies (Minor): Augite orthopyroxene basaltic andesite
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Aosawa - Nikko river - Kanomata river - Shirasawa river - Matsumine - Nakanomata river - Menokawa river - Omata river - Aizawa river - Tazawa river, Sakata city, Yamagata, Yamagata pref.; Takasaka dam, Mamurogawa city, Mogami county, Yamagata pref.
- Fossils (Shellfishes): Chlamys cf. cosibensis, Chlamys kaneharai, Clementia sp., Gloriballium crassivenium, Lima goliath, Lucinoma sp., Mizuhopecten cf. paraplebeius
- Fossils (Nishikurosawa fauna, Foraminifera): Bulimina cf. inflata, Cibicides malloryi, Cibicides cf. ungerianus, Cribrostomoides subglobosum, Cyclammina japonica, Florilus kidoharaensis, Globigerina angustiumbilicata, Globigerina falconesis, Globigerina cf. norcrossi, Globigerina praebulloides, Globigerina woodi, Globigerinoides immaturus, Globoquadrina altispira altispira, Globoquadrina dehiscens dehiscens, Globoquadrina venezuelana, Globorotalia adamantea, Globorotalia miozea conoidea, Globorotalia miozea miozea, Globorotalia peripheroacuta, Globorotalia peripheroronda, Globorotalia praemenardii, Globorotalia quinifalcata, Globorotalia sciula, Globorotalia siakensis, Goesella sp., Gyroidina orbicularis, Haplophragmoides spp., Hopkinsina morimachiensis, Hopkinsina nanataniensis, Hopkinsina sinboi, Martinottiella communis, Melonis pompilioides, Orbulina suturalis, Orbulina universa, Planulina wuellerstorfi, Praeglobobulimina kamedaensis, Praeglobobulimina pupoides, Praescitula sp., Pullenia bulloides, Sigmoilopsis schlumbergeri, Sphaeroidina bulloides, Sphaeroidinellopsis seminulina seminulina, Spirosigmoilinella compressa
- Fossils (Radiolarians): Cromyodruppa concentrica, Spongodiscus spp.
- Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.8, pp.389-404 DOI
- Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.1, pp.1-15 DOI
- Nakano and Tsuchiya (1992) Geology of the Chokaisan and Fukura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 138p. (in Japanese with English abstract 7p.)
- Tsuchiya (1989) Geology of the Osawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 6p.)
- Ozawa et al. (1988) Geology of the Yashima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 87p. (in Japanese with English abstract 5p.)
- Tsuchiya et al. (1984) Geology of the Tsuruoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 77p. (in Japanese with English abstract 5p.)
- Ozawa et al. (1982) Geology of the Kisakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 4p.)
- Ikebe et al. (1979) Geology of the Sakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 42p. (in Japanese with English abstract 3p.)