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Horinouchi Alternation (Makiyama, 1925)
Invalid synonym: Horinouchi Formation
- Type locality: Horinouchi, Kikukawa city, Shizuoka prefecture
- Coherent formation
- Pliocene - early Pleistocene
- Correlation (Lower): Hiki Alternation
- Sedimentary facies: Marine
- Sedimentary facies: Forearc basin (Sagara-Kakegawa Basin) deposit
- Sedimentary facies: Lower submarine fan - Basin floor
- Depth of water: Upper bathyal (400 - 500 m)
- Lithofacies: Interbedded sandstone and mudstone
- Sedimentary structures: Parallel stratification
- Kakegawa Group (Kikukawa, Shizuoka pref.)
- [ Upper ]
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- Horinouchi Alternation
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Horinouchi - Takahashi - Nishimura - Kokuzo, Kikukawa city, Shizuoka pref.; Nishihagima, Makinohara city, Shizuoka pref.; Niino - Kadoya - Shiobarasinden, Omaezaki city, Shizuoka pref.
- Fossils: Sponges (Sagarites chitanii), Calcareous nannofossils
- Fossils (Shellfishes): Neilonella coix
- Fossils (Foraminifera): Globigerina nepenthes, Globorotalia inflata, Globorotalia tosaensis, Pulleniatina sp.
- Tephra: Hr, Ar, Sg, Kg, Sh, Bo, Io
- Sugiyama et al. (1988) Geology of the Omaezaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 153p. (in Japanese with English abstract 6p.)