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Onomatsuzawa Formation Agency for Natural Resources and Energy, Ministry of International Trade and Industry, 1976

Hanayamazawa Formation was separated by Tsuchiya et al. (1997).

• Type locality: Onomatsu creek, Nihasama river, Kurihara city, Miyagi prefecture
• Coherent formation
• Miocene

• Sedimentary facies: Lacustrine or Terrestrial
• Lithofacies: Acidic tuff, Conglomerate, Tuffaceous sandstone, Siltstone
• Lithofacies (Minor): Lignite
• Sedimentary structures: Cross stratification

• Thickness: 700 m
• Upper limit: Conformity (Genbi Formation), Unconformity (Tatsunokuchi Formation, Onoda Formation)
• Lower limit: Unconformity (Kuzumine Formation, Hosokura Formation, Nanamagari Formation)

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

• Distribution: Onomatsu creek, Nihasama river, Kurihara city, Miyagi pref.; Kamisukizawa - Iwaida, Uguisuzawa town, Kurihara city, Miyagi pref.; Takamatsu, Kurihara city, Miyagi pref.
• Fossils: Plants

• Tsuchiya et al. (1997) Geology of the Iwagasaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 96p. (in Japanese with English abstract 4p.)