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Jishabatake Formation Ida, 1945
- Coherent formation
- Trough basin-fill deposit at the collision boundary between Izu-Bonin-Mariana arc and Southwest - East Japan island arc
- Back-arc basin volcanic activity at the back-arc basin of Izu-Bonin-Mariana arc
- late Miocene - Pliocene
- Correlation: Kaibushi Mudstone Member
- Sedimentary facies: Marine
- Lithofacies: Mudstone
- Lithofacies (Minor): Mudstone-dominant interbedded sandstone and mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Shizuoka pref.
- Fossils (Foraminifera): Globigerina falconensis, Globigerina nepenthes, Globigerinella obesa, Globigerinides bollii, Globigerinita glutinata, Globigerinoides conglobatus, Globigerinoides obliquus extremus, Globigerinoides obliquus obliquus, Globigerinoides sacculifer, Globigerinoides trilobus, Globoquadrina altispira, Globoquadrina dehiscens advena, Globoquadrina dehiscens dehiscens, Globoquadrina venezuelana, Globorotalia conoidea, Globorotalia menardii, Neogloboquadrina acostaensis, Neogloboquadrina pachydermaOrbulina sluralis, Orbulina universa, Sphaeroidinellopsis seminulina, Sphaeroidinellopsis subdehiscens
- Sugiyama and Shimokawa (1990) Geology of the Shimizu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 8p.)