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(Invalid name) Ogawa Formation (Honma, 1931) Kato et al., 1989
Redefined by dividing into Susobana Formation and Ronji Formation in ascending order.
- Type locality: Omigawa river, Sanseiji, Ikusaka city - Sashikiri, Chikuhoku city, Higashichikuma county, Nagano prefecture
- Coherent formation
- Miocene
- Intruded by: Kitayama Dacite, Andesitic basalt sills, Andesite dykes
- Sedimentary facies: Marine
- Sedimentary facies: Slump
- Sedimentary facies: Delta front progradated to the shelf edge, Inner shelf shallower than the storm wave base, Prodelta at the inner shelf, Lower shoreface shallower than the fair-weather wave base, Back shore to Fore shore, Braided river
- Lithofacies: Sandstone-dominant part and mudstone-dominant part are interfingering, and each part is defined as members.
- Lithofacies (Sandstone-dominat): Sandstone, Sandstone-dominant interbedded sandstone and mudstone
- Lithofacies (Sandstone-dominat, Minor): Conglomerate
- Lithofacies (Mudstone-dominat): Mudstone, Sandy mudstone, Mudstone-dominant interbedded sandstone and mudstone
- Sedimentary structures: Channel structures, Wave-formed ripples, Trough cross-stratification, Wedge-shaped cross-stratification, Graded bedding
- (Invalid name) Ogawa Formation (Hikage, Nagano pref.)
- [ Upper ]
- --------------
- Yanagisawa Member
- --------------
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ogawa river - Kawakami creek, Ogawa city, Kamiminochi county, Nagano pref.; Kanakuma river - Yasaka, Miasa, Omachi city, Nagano pref.; Ooka, Nagano city, Nagano pref.; Susobana river, Minaminagano - Zenkojionsen, Nagano city, Nagano pref.; Saikawa river, Koichi - Naniaisewaki, Nagano city, Nagano pref.; Sumeragi, Nakajo, Nagano city, Nagano pref.; Yamahokari, Shinshushinmachi town, Nagano city, Nagano pref.; Omigawa river, Sanseiji, Ikusaka city - Sashikiri, Chikuhoku city, Higashichikuma county, Nagano pref.; Iwaido - Midarehashi, Chikuhoku city, Higashichikuma county, Nagano pref.
- Fossils (Shellfishes): Acila divaricata, Anadara ninohensis, Anisocorbula venusta, Astarte (Tridonta) borealis, Barbatia sp., Cadella sp., Callista brevisiphonata, Calyptraea tokunagai, Cancellaria? sp., Clinocardium shinjiense, Cultellus izumoensis, Dosinia (Kaneharaia) kaneharai, Felaniella usta, Fusinus cf. muricatoides, Glycymeris crassa, Glycymeris crassa ikezawensis, Glycymeris ikusakensis, Glycymeris k-suzukii, Glycymeris yamasakii, Laevicardium angustum, Leucotina cf. gigantea, Lucina mochizukii, Lucinoma acutilineata, Macoma incongrua, Macoma cf. izurensis, Macoma nipponica, Macoma shinanoensis, Macoma tokyoensis, Mactra sulcataria, Margarites aiyoshiensis, Mercenaria y-iizukai, Modiolus sp., Nassarius nakamurai, Nassarius (Zeuxis) caelatus, Neverita fissuratus, Olivella spretoides, Ostrea sp., Peronidia venulosa, Solen cf. stricta, Solen tanosawaensis, Soletellina minoensis, Spisula (Mactromeris) yoyi, Spisula sachalinensis, Tectonatica janthostomoides, Trachycardium shiobarense, Turritella sp., Yoldia (Cnesterium) notabilis aidaensis
- Fossils (Trace fossils): Thalassinoides isp., Ophiomorpha isp., Rosselia isp.
- Seki and Hoyanagi (2015) Jour. Geol. Soc. Japan, vol.121, no.8, pp.279-292, DOI
- Tanabe (2015) Jour. Geol. Soc. Japan, vol.121, no.8, pp.265-278, DOI
- Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)
- 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.)
- Kato and Sato (1983) Geology of the Shinano-Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 7p.)
- Kato (1980) Geology of the Sakaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)