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Ohno Formation

Invalid synonym: Shimoda Formation

• Coherent formation
• early Miocene (20 - 17 Ma, Radiolarians)

• Sedimentary facies: Marine
• Sedimentary facies: Inner bay (Shellfishes)
• Depth of water: 20 m or shallower (Upper part of upper sublittoral zone, Shellfishes)
• Lithofacies: Mudstone
• Lithofacies (Minor): Sandstone, Interbedded sandstone and mudstone, Felsic tuff, Tuffaceous mudstone

• Upper limit: Conformity (Kadoya Formation)
• Lower limit: Conformity (Kawakado Formation)

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

• Distribution: Taguchi, Shitara city - Ebi, Shinjo city - Midono river, Toei city, Aichi pref.
• Fossils (Shellfishes): Lucinoma acutilineatum, Macoma izurensis, Macoma optiva, Chlamys cf. iwamurensis, Fissidentalium sp., Turritella ichishiensis
• Fossils (Radiolarians): Cyrtocapsella tetrapera, Cenosphaera coronata, Cenosphaera cf. coronataformis
• Fossils (Trace): Phycosiphon incertum

• Hoshi and Ogawa (2012) Jour. Geol. Soc. Japan, vol.118, no.11, pp.748-761 DOI
• Hoshi and Saida (2009) Jour. Geol. Soc. Japan, vol.115, no.5, pp.193-205 DOI