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Ma 1 Ichihara, 1960
Invalid synonym: Ayamedaiichi Marine Clay Bed, Utahime Clay Bed
- Coherent formation
- Pleistocene
- Sedimentary facies: Marine
- Sedimentary facies (Upper): Lacustrine
- Sedimentary facies: Calm inner bay, Lagoon
- Lithofacies: Clay, Silt
- Lithofacies (Minor): Sands
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Osaka pref.; Kobe city, Hyogo pref.; Koyoen - Nikawa river - Lake Gokaike - Kurakuen - Ashiya cemetery - Yamate town, Nishinomiya city, Hyogo pref.; Kitainayazuma - Zakuro, Seika city, Soraku county, Kyoto pref.; Soneyama, Kizugawa city, Kyoto pref.; Narazaka town - Lake Ayameike, Nara city, Nara pref.
- Fossils: Fishes, Sharks (Teeth), Crabs, Insecgts, Diatoms, Dinoflagellates
- Fossils (Shellfishes): Corbicula sp., Tegillarca sp.
- Fossils (Plants): Trapa macropoda, Beech plants, Pinus densiflora
- Tephra: Ss-Pnk
- Hongo (2009) Jour. Geol. Soc. Japan, vol.115, no.2, pp.64-79 DOI
- Miyachi et al. (2005) Geology of the Kyoto-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 90p. (in Japanese with English abstract 4p.)
- Miyachi et al. (2001) Geology of the Osaka-Tohokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 130p. (in Japanese with English abstract 6p.)
- Ozaki et al. (2000) Geology of the Nara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 162p. (in Japanese with English abstract 5p.)
- Huzita and Kasama (1983) Geology of the Kobe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 115p. (in Japanese with English abstract 8p.)
- Huzita and Kasama (1982) Geology of the Osaka-Seihokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 8p.)