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Otadai Formation (Ueda, 1930) Minashi et al., 1959
Invalid synonym: Kodairagadai Formation, Sakahata Formation
- Sedimentary facies: Marine
- Sedimentary facies: upper - middle Continental slope (Foraminifera)
- Sedimentary facies: middle - lower Submarine fan
- Sedimentary facies (Turbidite): Overflow deposit from turbidity currents in Higashihigasawa submarine valley
- Water temperature: Warm ocean current
- Depth of water: ca. 1, 500 m
- Lithofacies: Turbidite
- Lithofacies: Sandstone-dominant interbedded sandstone and mudstone, Mudstone-dominant interbedded sandstone and mudstone
- Sedimentary structures: Slump structure
- Thickness: 95 - 640 m
- Upper limit: Bottom of sandstone-dominant interbedded sandstone and mudstone, Top of O1
Upper limit: Conformity (Umegase Formation)
- Lower limit: Bottom of O27
- Lower limit: Conformity (Kiwada Formation)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Otadai, Otaki city, Isumi county, Chiba pref.; Torami, Ichinomiya city, Chosei county, Chiba pref.; Ichinono - Kuniyoshi - Nakahara, Isumi city, Chiba pref.; Honoki - Fujiwara - Okawasaki - Higashiowada - Terao - Minato, Futtsu city, Chiba pref.
- Fossils (Plants): Juglans cinerea var. megacinerea
- Fossils (Shellfishes): Ancistrolepis trochoideus, Limopsis uwadokoi, Periploma plane, Portlandia lischkei
- Fossils (Foraminifera): Globorotalia tosaensis, Globorotalia truncatulinoides
- Fossils (Diatoms): Actinocyclus oculatus
- Fossils (Calcareous nannofossils): Gephyrocapsa parallela
- Fossils (Pollen): Alnus sp., Picea sp., Pinus sp., Quercus sp., Taxodiaceae, Tsuga sp.
- Fossils (Trace fossils): Zoophycos isp.
- Tephra: O1, O2, O3, O4, O4.5, O5, O6, O7, O8, O11, O12, O13, O15, O16, O18 (JA-O18L), O19, O21, O22, O24, O26, O27, O28, O29, O30, O31
- Utsunomiya and Ooi (2019) Geology of the Kazusa-Ohara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
- Tamura et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.23-39 DOI
- GSSP proposal group (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.5-22 DOI
- Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
- Suzuki and Murata (2011) Jour. Geol. Soc. Japan, vol.117, no.7, pp.379-397 DOI
- Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)