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Tenguyama Formation Hayakawa and Takemura, 1987

Invalid synonym: Tenguyama Sandstone Member

• Type locality: Mount Tengu, Ranjo, Tonami city, Toyama prefecture
• Coherent formation
• middle Miocene
• Contemporaneous heterotopic facies: Hirabayashi Sandstone Member
• Correlation: Takabatake Formation

• Lithofacies: Sandstone
• Lithofacies (Minor): Conglomerate, Pumiceous sandstone, Lignite

• Thickness: ca. 150 m
• Upper limit: Bottom of conglomerate bed above the sandstone
• Upper limit: Conformity (Aoidani Mudstone Member), Arayama Unconformity (Otogawa Formation)
• Lower limit: Bottom of coarse clastic rock bed
• Lower limit: Transitional (Wadagawabashi Conglomerate Member), Ikahama Unconformity (Higashibessho Formation), Unconformity (Mitani Mudstone Member)

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

• Distribution: Mount Tengu, Ranjo, Tonami city, Toyama pref.; Osedani, Toyama city, Toyama pref.
• Deposit: Senkoji coal mine

• Nakajima et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.7, pp.483-516 DOI
• 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.)