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Hanareyama Formation Yabe and Aoki, 1924

• Type locality: Hanareyama, Kuji, Hitachi city, Ibaraki prefecture
• Coherent formation
• early - late Pliocene

• Sedimentary facies: Marine
• Lithofacies: Pumiceous - tuffaceous sandstone
• Lithofacies (Minor): Tuffaceous mudstone

• Thickness: ca. 30 m
• Upper limit: Unconformity (Namegata Member)
• Lower limit: Conformity? (Kume Formation), Unconformity (Taga Group)

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

• Distribution: Hanareyama, Kuji, Hitachi city, Ibaraki pref.
• Fossils: Elephants (Stegodon elephantoides)
• Fossils (Sharks): Calchalius sp., Chalcalodon megalodon, Isurus hastalis

• Sakamoto et al. (1972) Geology of the Nakaminato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 5p.)