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Higuchidani Formation Nagata et al., 2015

• Type locality: Higuchi valley, Muikaichi, Yoshika city, Kanoashi county, Shimane prefecture
• Coherent formation
• Early Jurassic, Pliensbachian - Toarcian (Ammonoids), Hettangian - Sinemurian (Bivalves)

• Sedimentary facies: Marine
• Depth of water: Shallow
• Lithofacies: Sandy mudstone
• Lithofacies (Minor): Sandstone, Tuff
• Sedimentary structures: Bioturbation

• Thickness: 60 - 120 m
• Upper limit: Unconformity (Kanmon Group)
• Lower limit: Cnformity

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

• Distribution: Higuchi valley, Muikaichi, Yoshika city, Kanoashi county, Shimane pref.; Oroji valley, Kinzan valley, Tanohara, Yoshika city, Kanoashi county, Shimane pref.
• Fossils: Gastropods, Plants
• Fossils (Trace fossils): Phycosiphon isp., Spirophycus isp.
• Fossils (Bivalves): Kolymonectes staeschei (Polubotko), Ryderia texturata (Terquem and Piette), Palmoxytoma cygnipes (Young and Bird), Pseudomytiloides matsumotoi (Hayami), Oxytoma sp., Pleuromya sp.
• Fossils (Ammonoids): Fontanelliceras? sp., Amaltheus? sp.

• Nagata et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.2, pp.59-69 DOI