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Hishinai Formation Kurata, 1941

• Type locality: Hishinai river, Waga town, Kitakami city, Iwate prefecture
• Coherent formation
• Miocene
• Intruded by: Maetsukamiyama Acidic Volcanic Rocks

• Sedimentary facies: Shallow marine (Shellfish fossils)
• Lithofacies: Interbedded sandstone and mudstone
• Lithofacies (Mionr): Tuff

• Thickness: 150 - 250 m
• Upper limit: Unconformity (Motohata Formation, Kunimiyama Andesite)
• Lower limit: Conformity (Tsunatori Formation)

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

• Distribution: Hishinai river, Waga town, Kitakami city, Iwate pref.
• Fossils: Fish scales
• Fossils (Shellfishes): Cardium sp., Chlamys sp., Clementia vatheleti, Conchocele bisectoides, Conchocele cf. disjuncta, Cryptomya sp., Glycymeris sp., Lima sp., Lucinoma acutilineata, Macoma incongrua, Macoma cf. optiva, Macoma tokyoensis, Moerella cf. jurenilis, Mya sp., Nemocardium samarangae, Nuculana sp., Pationpecten cf. kimurai, Periploma sp., Phos sp., Portlandia cf. hurukutiensis, Portlandia thraciaeformis, Tectonatica cf. janthostoma, Tellina? sp., Yoldia cf. johanni, Yoldia cf. sagittaria, Yoldia cf. scapha
• Fossils (Plants): Acer cf. diabolium, Alnus japonica, Cinnamomum scheuchzeri, Fagus oblongus, Fagus palaeocrenata, Quercus protosaliciha, Quercus cf. serrata, Salix? sp., Zelkova ungeri

• Ozawa et al. (1971) Geology of the Kawashiri District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 40p. (in Japanese with English abstract 5p.)