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Ogikubo Formation (Suzuki, 1938) Nagamori et al., 2003
Invalid synonym: Ogikubo Sandy Mudstone Member, Shimokusukawa Formation
It had been treated as a member of Shigarami Formation.
- Type locality: Tsumusawa - Nakagumi, Togakushi, Nagano city, Nagano prefecture
- Coherent formation
- early Pliocene
- Sedimentary facies (Upper): Freshwater
- Sedimentary facies (Lower): Marine
- Water temperature: Cold ocean current
- Depth of water (Lower): Inner bay, Tidal zone, Upper sublittoral zone
- Lithofacies: Andesitic tuffaceous sandstone
- Lithofacies: Conglomerate, Interbedded sandstone and mudstone, Felsic tuff, Scoriaceous tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tsumusawa - Nakagumi - Kuzuryu - Hiraide, Togakushi, Nagano city, Nagano pref.
- Fossils: Sharks (Carcharodon carcharias), Echinoids (Echinarachnius microthyroides), Crabs, Bryozoans, Brachiopods, Boring shell (Penitella kamakurensis)
- Fossils (Fishes): Ammodytidae, Bothidae, Cottidae, Liparidae, Myctophidae, Scorpaenidae, Stichaeidae
- Fossils (Barnacles): Balanus cf. amphitrite communis, Balanus cf. rostratus
- Fossils (Shigarami fauna = Shimonireki fauna): Acmaea sigaramiensis, Anadara amicula, Anadara subcrenata, Ancistrolepis trochoides, Anisocorbula venusta, Anomia chinensis, Anomia cylaeum, Arca boucardi, Batillaria sp., Bittium sp., Calliostoma sp., Callista brevisiphonata, Callista chinensis, Cardium sp., Chlamys cosibensis, Chlamys (Minachlomys) nobilis, Chlamys daishakaensis, Chlamys foeda, Chlamys ingeniosa tanakai, Chlamys jousseaumei, Chlamys lioica shigaramiensis, Chlamys cf. nipponensis, Chlamys obesa, Chlamys cf. sendaiensis, Chlamys swiftii, Chlamys tamuras, Chlamys tanakai, Clementia sp., Clinocardium ciliatum, Clinocardium decoratum, Clinocardium nuttalli, Conchocele bisecta, Conchocele bisectoides, Crassostrea gigas, Crenella formicata, Cryptonatica janthostomoides, Cycladicama cumingii, Cyclodichama? cumingi, Cyclina sinensis, Dosinia angulosa, Dosinia japonica, Dosinia tomikawensis, Enida japonica, Glycymeris cf. nipponica, Glycymeris yamasakii, Haliotis aff. varia, Heteromacoma irus, Homalopoma sangarensis, Hydroides defrenatus, Laevicardium angustum, Littorina (Littorivaga) cf. brevicula, Lucinoma aff. acutilineata, Lucinoma annulata, Macoma praetexta, Mactromeris sp., Mercenaria chitaniana, Mercenaria sigaramiensis, Mercenaria cf. stimpsoni, Mercenaria cf. yokoyamai, Mizuhopecten tryblium, Mizuhopecten yamasakii, Modiolus difficilis, Modiolus modiolus diffieilis, Monia macroschisma, Monia unbonata, Montacuta sp., Mya arenaria oonogai, Mya (Arenomya) grewingki var. elongata, Mya japonica, Natica severa, Nemocardium samarangae, Neptunea (Barbitonia) cf. arthritiea, Neverita sp., Notoacmaea sp., Nucula? sp., Nuttallia commoda, Ostrea (Crassostrea) gravitesta, Pandora? sp., Panopea japonica, Paphia sp., Patinopecten tryblium, Patinopecten yamasakii, Penitella kamakurensis, Peronidia venulosa, Petricola divergens, Phlyctiderma japonicum, Placamen sp., Placopecten cf. setanaensis, Polinites (Glassaulex) sp., Polynemamussium alaskense, Porterius dalli, Protothaca tateiwai, Pseudocardium sachalinensis, Pseudogrammatodon dalli, Puncturella nobilis, Ruditapes philippinarum, Saletellina minoensis, Saletellina (Nuttallia) petri commoda, Sanguinolaria olivecea, Saxidomus purpulatus, Serpulorbis shinanoensis, Siphonaria sp., Solen grandis, Solen krusensterni, Surpulorbis imbricatus, Swiftpecten swiftii, Tectulla pallida, Tectura cf. asimiformis, Thracia hitosaoensis, Thracia komayashikiensis, Trapezium liratum, Tresus keenae, Tridonta alaskensis, Tugalia gigas, Turritella saishuensis, Turritella saishuensis motidukii, Venericardia sp., Veremolpa sp.
- Fossils (Brachiopods): Coptothyris grayi, Terebratella sp.
- Fossils (Foraminifera): Globigerina apertuna, Neogloboquadrina dutertrei
- Tephra: OT10
- Tanabe (2015) Jour. Geol. Soc. Japan, vol.121, no.8, pp.265-278, DOI
- Amano et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.10, pp.516-531 DOI
- Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)
- Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)