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Kasamatsu Formation (Konno, 1938) Eguchi et al., 1953
- Type locality: Kasamatsu, Ohisa town, Iwaki city, Fukushima prefecture
- Coherent formation
- southern Yezo Forearc basin (Jobanoki basin)
- Late Cretaceous, late Coniacian
- Sedimentary facies: Fluvial
- Sedimentary facies (Minor): Marine
- Sedimentary facies: Alluvial plain
- Sedimentary facies: Meandering river Braided river, Flood plain
- Sedimentary facies (Minor): Lagoon
- Sedimentary facies (Basal): Channel deposit
- Lithofacies: Sandstone, Interbedded sandy siltstone and siltstone
- Lithofacies (Basal): Sandstone, Conglomerate
- Sedimentary structures: Cross stratification, Load cast, Flame structure, Convolute lamination, Bioturbation
- Thickness: ca. 80 - 200 m
- Thickness (Basal): 5 m
- Upper limit: Bottom of the very thick sandy siltstone-deficient sandstone bed
- Upper limit: Conformity (Kohisagawa Member), Unconformity (Shiramizu Group)
- Lower limit: Bottom of pebble-bearing coarse sandstone overlying sandy siltstone
- Lower limit: Conformity (Obisagawa Member)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kasamatsu, Ohisa town, Iwaki city, Fukushima pref.; Kitazawa, Hirono city, Futaba county, Fukushima pref.
- Fossils: Plant fragments, Pollen, Spores
- Ando et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.49-67 DOI
- Kubo et al. (2002) Geology of the Kawamae and Ide District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 136p. (in Japanese with English abstract 6p.)
- Iwao and Matsui (1961) Taira and Kawamae, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 17p.)