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Ma 13
- Coherent formation
- Silt-bearing clay of the present Osaka bay floor
- Holocene (Jomon transgression)
- Sedimentary facies: Marine
- Sedimentary facies: Inner bay
- Lithofacies: Clay
- Host: Namba Formation
- Thickness: 8 - 20 m
- Upper limit: Unconformity
- Lower limit: Unconformity
- Distribution: Underground of Osaka plain; Kobe port, Kobe city, Hyogo pref.
- Wakita et al. (2013) Geology of the Kyoto-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 124p. (in Japanese with English abstract 3p.)
- Hongo (2009) Jour. Geol. Soc. Japan, vol.115, no.2, pp.64-79 DOI
- 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.)
- Miyachi et al. (1998) Geology of the Osaka-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 113p. (in Japanese with English abstract 5p.)
- Huzita and Maeda (1985) Geology of the Osaka-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 5p.)
- Huzita and Maeda (1984) Geology of the Suma District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 101p. (in Japanese with English abstract 7p.)
- 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.)