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Sugegaya Alternation Iki, 1909
Invalid synonym: Tokigaya Formation
- Type locality: Sugegaya, Makinohara city, Shizuoka prefecture
- Coherent formation
- middle Miocene - Pliocene
- Correlation (Upper): Jitogata Alternation
- Sedimentary facies: Marine
- Sedimentary facies: Forearc basin (Sagara-Kakegawa Basin) deposit
- Lithofacies (Upper): Sandstone-dominant interbedded sandstone and mudstone
- Lithofacies (Middle): Conglomerate, Sandstone, Mudstone
- Lithofacies (Lower): Conglomerate, Sandstone, Mudstone
- Sedimentary structures: Graded bedding
- Sedimentary structures (Middle): Slump structures
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sugegaya - Tsuchizawa - Okami - Hirugaya - Nigorisawa - Kuroko, Makinohara city, Shizuoka pref.; Iwachi, Omaezaki city, Shizuoka pref.
- Fossils: Sponges (Sagarites chitanii), Calcareous nannofossils, Foraminifera
- Fossils (Shellfishes): Amussiopecten iitomiensis, Fulgoraria sp., Glycymeris sp., Limopsis sp., Mitra sp., Siphonalia sp., Tectonatica janthostomoides, Venericardia sp.
- Fossils (Foraminifera): Globorotalia siakensis
- 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.)