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Mizukamidani Formation (Kobayashi et al., 1957) Takeuchi et al., 2015
- Type locality: Mizukamidani valley, Asahi city, Shimoniikawa county, Toyama prefecture
- Coherent formation
- Early Cretaceous, Aptian (123 - 109 Ma, U-Pb)
- Intruded by: Andesite dikes
- Correlation: Minamimatadani Conglomerate Member
- Lithofacies (Upper): Mudstone
- Lithofacies (Upper, Minor): Conglomerate, Sandstone, Tuff
- Lithofacies (Middle): Mudstone, Sandstone, Conglomerate
- Lithofacies (Lower): Tuffaceous mudstone, Tuffaceous sandstone, Sandstone, Conglomerate
- Sedimentary structures: Cross-stratification, Up-ward fining
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sakaigawa river - Mizukamidani valley - Otakidani valley - Shinadani valley - Aimatadani valley - Sasakomatadani valley, Asahi city, Shimoniikawa county, Toyama pref.; Agero river, Agero, Itoigawa city, Niigata pref.
- Fossls: Plants (Onychiopsis elongata)
- Takeuchi et al. (2017) Geology of the Tomari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 121p. (in Japanese with English abstract 4p.)
- Takeuchi et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.7, pp.193-216, DOI
- Takeuchi et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.1, pp.1-17 DOI