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Sagara Alternation
Invalid synonym: Sagara Formation
- Type locality: Sagara, Makinohara city, Shizuoka prefecture
- Coherent formation
- middle Miocene - Pliocene
- Contemporaneous heterotopic facies (Lower): Yokobuna Mudstone
- Sedimentary facies: Marine
- Sedimentary facies: Forearc basin (Sagara-Kakegawa Basin) deposit
- Depth of water: upper part of Middle bathyal (600 - 1,000 m)
- Lithofacies: Interbedded sandstone and mudstone
- Sedimentary structures: Graded bedding, Slump structures
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sagara - Tanigawa - Ebie - Ondo, Makinohara city, Shizuoka pref.; Koizumi - Yamagaya - Kamihiki - Kasana - Horinoshinden - Shirowa, Omaezaki city, Shizuoka pref.
- Fossils: Sponges (Sagarites chitanii), Calcareous nannofossils, Foraminifera
- Fossils (Shellfishes): Amussiopecten iitomiensis, Chlamys miurensis
- Fossils (Foraminifera): Globorotalia tumida plesiotumida
- 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.)
- Tephra: Ka