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Nirehara Formation (Tsuda and Chiji, 1950) Nakajima et al., 2019

Nirehara Formation had been a member of Yatsuo Group.

• Type locality: Jinzu river, Nirehara, Toyama city, Toyama prefecture
• Coherent formation
• early Miocene

• Sedimentary facies (Upper): Shallow marine or Lake
• Sedimentary facies (Lower): Alluvial fan, Gravelly fan delta
• Lithofacies: Conglomerate, Sandstone Mudstone
• Lithofacies (Bottom): Conglomerate

• Thickness: ca. 100 - 300 m or thicker
• Upper limit: Unconformity (Matsukura Tuff Breccia Member, Yatsuo Group)
• Lower limit: Unconformity (Jinzu Group, Futomiyama Group, Shokawa Granite, Shimaji Formation, Koshimizu Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Nirehara - Imozu - Kiridani - Myogashima, Toyama city, Toyama pref.; Shogawa town, Tonami city, Toyama pref.; Toga river, Nanto city, Toyama pref.

• Nakajima et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.7, pp.483-516 DOI
• Kunugiza et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.83-101 DOI
• Nozawa et al. (1981) Geology of the Shirokimine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 10p.)
• 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.)
• Inoue et al. (1964) Johana, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 5p.)
• Sakamoto and Nozawa (1960) Yatsuo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 8p.)
• Nozawa and Sakamoto (1960) Gohyakkoku, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 10p.)