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Jikkoku Formation (Tamura et al., 1984) Ozaki and Sugiyama, 2018
Invalid synonym: Jukkoku Formation, Togawa Formation
- Type locality: Oyanagawa river, Jikkoku, Fujikawa city, Minamikoma county, Yamanashi prefecture
- Coherent formation
- Miocene
- Correlation: Arakura Formation
- Sedimentary facies: Marine
- Sedimentary facies: Debrite (Reworked volcaniclastic rocks by a collapse of volcanic edifice)
- Lithofacies: Andesite - Basalt volcanic breccia, Tuff breccia, Lava
- Lithofacies (Minor): Mudstone, Mudstone-dominant interbedded sandstone and mudstone, Tuffaceous sandstone, Volcanic conglomerate
- Sedimentary structures: Parallel stratificaiton, Slump structures
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Oyanagawa river - Mount Gotenyama - Mount Fujimiyama, Fujikawa city, Minamikoma county, Yamanashi pref.
- Fossils (Foraminifera): Bathysiphon spp., Bulimina spp., Chilostomella oolina, Cibicides aknerianus, Cibicidoides pseudoungerianus, Cribrostomides subglobosum, Cyclammina spp., Eggerella spp., Eponides spp., Glabratella sp., Globigerinoides immaturus, Globigerinoides quadrilobatus, Blobobulimina spp., Globoquadrina dehiscens, Globoquadrina venezuelana, Globorotalia archeomenardii, Globorotalia fohsi lobata, Globorotalia mayeri, Globorotalia peripheroronda, Gyroidina spp., Karreriella aff. baccata, Melonis spp., Orbulina universa, Planulina wuellestorfi, Praeorbulina glomerosa, Pyrgo cf. murrhina, Sphaeroidinellopsis subdehiscens, Stilostomella spp., Textularia lythostrota, Trochammina asagaiensis
- Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)