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Kusanagi Mud Bed

• Coherent formation
• Pleistocene (Last Glacial Period)
• Correlation: Furuya Mud Bed, upper Hijikata Formation, Shimosueyoshi Formation, Kyomatsubara Sand Bed, Makinohara Gravel Bed

• Sedimentary facies: Marine
• Sedimentary facies: Inner bay
• Climate: Cool and Humid
• Lithofacies: Sandy silt, Silt
• Lithofacies (Minor): Sands

• Thickness: 30 - 100 m
• Upper limit: Transitional (Oshika Gravel Bed), Unconformity (Kuniyoshida Gravel Bed)
• Lower limit: Conformity (Kunozan Formation)

• Distribution: Udo hills, Suruga ward - Shimizu ward, Shizuoka city, Shizuoka pref.; Mabase - Higashioya - Kusanagi - Yoshida river, Shimizu ward, Shizuoka city, Shizuoka pref.
• Fossils: Shellfishes, Foraminifera, Ostracods, Bryozoans, Plants, Trace fossils (Pipe rocks)
• Fossils (ShellfishesŠL): Azorinus abbreviatus, Batillaria multiformis, Crassostrea gigas, Cyclina orientalis, Dentalium sp., Macoma incongrua, Paphia euglypta, Pecten albicans, Pillucina yamakawai, Saccella gordonis, Theora lubrica, Tritia festiva, Venus foveolata

• Sugiyama and Shimokawa (1990) Geology of the Shimizu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 8p.)
• Sugiyama et al. (1982) Geology of the Shizuoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 82p. (in Japanese with English abstract 9p.)