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Ozo Formation Akutsu, 1953

• Coherent formation
• middle Miocene (14.4 Ma, FT)
• Correlation: Lower Kobana Formation

• Sedimentary facies: Marine
• Sedimentary facies (Middle): Pyroclastic turbidite
• Water temperature: Cold ocean current (Foraminifera)
• Depth of water: Middle continental shelf (Foraminifera)
• Lithofacies (Upper): Tuffaceous siltstone, Calcareous siltstone
• Lithofacies (Middle): Rhyolite tuff, Lapilli tuff
• Lithofacies (Lower): Tuffaceous sandstone Calcareous sandstone
• Lithofacies (Bottom): Conglomerate, Sandstone
• Sedimentary structures (Middle): Graded bedding

• Thickness: ca. 60 m
• Thickness (Middle): 1 - 5 m
• Lower limit: Conformity (Oya Formation)

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

• Distribution: Utsunomiya hills, Tochigi pref.; Tsuruta, Utsunomiya city, Tochigi pref.
• Fossils: Whales, Sharks (Teeth), Echinoids, Plants, Foraminifera
• Fossils (Moniwa fauna): Shellfishes

• Matsui et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.89-102 DOI
• Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)
• Hayashi et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.3, pp.141-144 DOI