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Muroda Formation Imamura et al., 1951

Invalid synonym: Yamazaki Gravel Bed

• Type locality: Muroda - Kannondo - Yunoe, Uozu city, Toyama prefecture
• Coherent formation
• late Pliocene - early Pleistocene (2.57, 2.4 Ma, U-Pb; 2.36, 1.82 Ma, FT)

• Sedimentary facies: Shallow marine
• Lithofacies: Conglomerate, Tuffaceous sandstone
• Lithofacies (Minor): Muddy sandstone, Andesite tuff breccia, Andesite volcanic conglomerate

• Thickness: 10 - 350 m or thicker
• Upper limit: Unconformity (Kurehayama Gravel Bed)
• Lower limit: Unconformity (Takabatake Formation, Otogawa Formation, Shakusenji Formation)

• Distribution: Muroda - Kannondo - Yunoe - Tsubono - Kurosawa, Uozu city, Toyama pref.; Iwasaki, Asahi city, Shimoniikawa county, Toyama pref.; Tofukuji - Kamioura, Namerigawa city, Toyama pref.; Hio, Toyama city, Toyama pref.; Kasayaburi - Oritate, Kurobe city, Toyama pref.
• Fossils: Sponges (Spicule), Wood fragments, Trace fossils (Rosseria isp.)
• Tephra: Kasayaburi Pumiceous Tephra, Muroda Tuff

• Takeuchi et al. (2017) Geology of the Tomari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 121p. (in Japanese with English abstract 4p.)
• Tamura et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.1-20 DOI
• Sumi and Nozawa (1973) Geology of the Uozu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 5p.)