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Matsunoyama Formation (Ikebe, 1940) Noda, 1962

Abbr.: Tp

Invalid synonym: Matsunoyama Tuff

• Type locality: Matsunoyama hot spring, Matsunoyama, Tokamachi city, Niigata prefecture
• Volcanic rocks
• late Miocene (9.8, 8.7, 8.4 Ma, FT)
• Correlation: Upper Teradomari Formation, Nz Tephra
• Correlation (Top): Tt1, Tt2
• Intruded by: Hornblende porphyry

• Sedimentary facies: Marine
• Sedimentary facies: Submarine pyroclastic flow deposit
• Lithofacies: Dacite pumice tuff
• Lithofacies (Minor): Clinopyroxene orthopyroxene andesite lava, Mudstone
• Sedimentary structures (Top): Graded bedding
• Sedimentary structures (Upper): Parallel stratification

• Host: Taruda Formation
• Thickness: ca. 50 - 350 m
• Upper limit: Conformity (Taruda Formation)

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

• Distribution: Matsunoyama, Tokamachi city, Niigata pref.; Mount Nagakura, Yasuzuka ward, Joetsu city, Niiagata pref.; Sakurataki - Mount Fusube - Imonotsubo - Uro - Tajima - Takaba spring, Maki ward, Joetsu city, Niigata pref.
• Fossils: Fishes (family Clupeidae), Plants

• Takano (2011) Jour. Geol. Soc. Japan, vol.117, no.4, pp.238-258 DOI
• Takeuchi et al. (2000) Geology of the Matsunoyama Onsen District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 76p. (in Japanese with English abstract 5p.)
• Takeuchi and Kato (1994) Geology of the Takada-tobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 67p. (in Japanese with English abstract 5p.)