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Nanaorezaka Formation Suzuki, 1951
Invalid synonym: Seaburiyama Formation, Otakiyama Welded Tuff
- Type locality: Ote creek - Nanaorizaka, Izumi, Aizubange city, Kawanuma county, Fukushima prefecture
- Coherent formation
- early Pleistocene
- Sedimentary facies: Terrestrial
- Sedimentary facies: Fluvial
- Sedimentary facies (Upper): Pyroclastic flow, River, Hyperconcentrated flood flow
- Sedimentary facies (Lower, North): Braided river of alluvial fans
- Sedimentary facies (Lower, South): Braided river
- Lithofacies (Upper): Sands
- Lithofacies (Lower): Gravels
- Lithofacies (Lower, Minor): Sands, Silt
- Sedimentary structures (Upper): Low angle cross-stratification, Scour-fill cross-stratification
- Sedimentary structures (Lower): Imbrication, Trough cross-stratification
- Sedimentary structures (Lower, Minor): Parallel stratification
- Paleocurrent (Lower, North): Southeast
- Paleocurrent (Lower, South): Northwest
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ote creek - Nanaorizaka, Izumi, Aizubange city, Kawanuma county, Fukushima pref.; Mount Iimori, Aizuwakamatsu city, Fukushima pref.; Mount Otaki, Shimogo city, Minamiaizu county, Fukushima pref.
- Fossils (Plants): Abies cf. veitochii, Acer diabolicum, Alnus japonica, Betula platyphylla var. japonica, Brasenia schreberi, Buxus microphylla var. japonica, Carex dickinsii, Carex vesicaria, Celtis jessoensis, Ceratophyllum demersum, Cornus contraversa, Corylus heterophylla var. thunbergii, Corylus sieboldiana, Fagus crenata, Fagus microcarpa, Hippuris vulgaris, Ilex crenata, Juglans mandshurica, Juglans mikii, Magnolia kobus, Magnolia obovata, Menyanthes trifoliata, Menyanthes trifoliata var. minusculus, Phellodendron amurense, Picea jezoensis, Picea pleistoceaca, Pinus koraiensis, Polygonum maackianum, Potamogeton cf. exyphyllus, Quercus serrata, Rubus sp., Sambucus sp., Sassafras subtriloba, Scirpus mucronatus, Smilax china, Styrax japonica, Thyja cf. standishii, Trapa macropoda, Trapa mammillifera, Trapella sinensis, Tripetalea paniculata, Tsuga sp.
- Tephra (Shirakawa Pyroclastic Flow Deposits): Tenei Pyroclastic Flow Deposit, Nishigo Pyroclastic Flow Deposit, Nagurasawa Pyroclastic Flow Deposit, Ashino Pyroclastic Flow Deposit, Kumado Pyroclastic Flow Deposit
- Hasegawa et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.33-48 DOI
- Yamamoto et al. (2006) Geology of the Kitakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 5p.)
- Yamamoto (1999) Geology of the Tajima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 8p.)
- Yamamoto and Yoshioka (1992) Geology of the Wakamatsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 5p.)