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Ainosawa Formation Sato, 1956

• Type locality: Ainosawa, Tateishi, Minamisoma city, Fukushima prefecture
• Coherent formation
• late Devonian (Brachiopods)
• Correlation: Tobigamori Formation

• Sedimentary facies: Shallow marine
• Lithofacies (Upper): Shale
• Lithofacies (Middle): Interbedded tuff and sandstone
• Lithofacies (Lower) Tuffaceous shale

• Thickness: ca. 80 m
• Upper limit: Unconformity (Mano Formation, Uwano Formation)
• Lower limit: Unconformity (Matsugadaira Formation)

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

• Distribution: Ainosawa, Tateishi, Minamisoma city, Fukushima pref.; Mano river, Nagaoka, Kashima ward, Minamisoma city, Fukushima pref.
• Fossils (Brachiopods): Camarotoechia sp., Chonetes sp., Cyrtospirifer ainosawaensis Tazawa, Inose and Kaneko 2017, Cyrtospirifer cf. kindlei, Schizophoria? sp., Sinospirifer sinensis, Sinospirifer sinensis var. australis

• Tazawa et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.8, pp.653-656 DOI
• Tsuchiya et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.154-167 DOI
• Yanagisawa et al. (1996) Geology of the Somanakamura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 9p.)