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Sebayashi Formation Takei, 1963
- Type locality: Mamonosawa river, Sebayashi, Kanna city, Tano county, Gunma prefecture
- Coherent formation
- Early Cretaceous, late Barremiann - early Albian (Radiolarians, Ammonoids)
- Correlation: Mononobegawa Group
- Sedimentary facies: Brackish
- Lithofacies (Upper): Mudstone-dominant interbedded sandstone and mudstone, Mudstone
- Lithofacies (Upper, Minor): Sandstone
- Lithofacies (Lower): Arkose sandstone
- Sedimentary structures: Graded bedding, Cross stratification, Wave ripples
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: northwest Chichibu basin, Saitama pref. - Kanna city - Ueno city, Tano county, Gunma pref. - Saku city, Nagano pref.
- Distribution: Sebayashi, Kanna city, Tano county, Gunma pref.; Otomo - Mount Azumayasan, Ogano city, Chichibu county, Saitama pref.
- Fossils: Northern Tethyan
- Fossils: Gastropods, Belemnoids, Echinoids, Solitary corals, Crabs, Plants (Cladophlebis sp.), Trace fossils
- Fossils (Ammonoids): Barremites otsukai, Pseudohaploceras japonicum, Crioceratites (Paracrioceras) asiaticum, Silesites sp.
- Fossils (Bivalves): Astarte (Astarte) subsenecta, Astarte? minor, Cerithium? sup., Corbicula sanchuensis, Cucullaea? sp., Cuspidaria? sp., Entolium sp., Exogyrinae gen. et sp. indet, Gervillia forbesiana, Hayamina aff. matsukawai, Limatula nagaoi, Lopha sp., Lucinidae gen et sp. indet, Modiolus sp., Monia pseudotruncata, Nanonavis cf. yokoyamai, Neithea (Neithea) matsumotoi, Nemocardium (Nemocardium) yatsushiroense, Nipponitrigonia kikuchiana, Nucula sp., Ostrea sp., Panopea nagaoi, Pentacrinus sp., Pholadomya sp., Plectomya sp., Plicatula sp., Polymesoda radiatostriata, Propeamussium cowperi var. yubarensis, Pterinella shinoharai, Pterotrigonia (Pterotrigonia) hokkaidoana, Rastellum (Arctostrea) carinatum, Scittila dericatostriata, Spisula? sp., Surcula? sp., Xenocardita sp., Yabea akatsui
- Matsui et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.6, pp.261-266, DOI
- Hara et al. (2010) Geology of the Mitsumine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)
- Terabe and Matsuoka (2009) Jour. Geol. Soc. Japan, vol.115, no.3, pp.130-140 DOI
- Okubo and Horiguchi (1969) Geology of the Mamba District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 65p. (in Japanese with English abstract 5p.)