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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
• Upper limit: Unconformity
• Lower limit: Unconformity

• Distribution: Underground of Osaka plain

• 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.)
• 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.)