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Matsunagi Formation Yoshikawa et al., 2002

Invalid synonym: Orito Formation, Orito Member

• Type locality: Osaki - river mouth of Karasugawa river, Matsunagi town, Suzu city, Ishikawa prefecture
• Coherent formation
• early Miocene (21 - 18 Ma; 21 - 17 Ma, FT; 24 Ma, Ar-Ar; 23 - 19 Ma, K-Ar)
• Contemporaneous heterotopic facies: Kamiwazumi Formation

• Sedimentary facies: Marine
• Lithofacies (Upper): Andesite - Dacite lapilli tuff, Tuff breccia, Conglomerate, Sandstone, Mudstone
• Lithofacies (Lower): Olivine-bearing orthopyrxene clinopyroxene andesite lava, Orthopyroxene-bearing clinopyroxene andesite lava
• Sedimentary structures (Upper): Parallel stratification, Trough cross-stratification

• Thickness: 140 m or thicker
• Upper limit: Conformity (Horyuzan Formation), Unconformity (Higashiinnai Formation, Hojuji Formation)
• Lower limit: Unconformity (Konosuyama Formation)

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

• Distribution: Matsunagi town - Orito town, Suzu city, Ishikawa pref.; Jike - Kodomari, Misaki town, Suzu city, Ishikawa pref.
• Fossils: Noroshi flora
• Fossils: Soliary corals, Foraminifera, Dinoflagellates, Pollen
• Fossils (Shellfish): Anadara cf. watanabei, Conus (Chelyconus) tokunagai, Crassatellites osawanoensis, Dosinia cf. kawagensis, Mizuhopecten kibiyamai, Placopeten cf. nomurai
• Fossils (Trace fossils): Ophiomorpha isp.

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Yoshikawa et al. (2002) Geology of the Suzumisaki, Noto-iida and Horyuzan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 4p.)