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Shiritakayama Formation (Yoshimura and Adachi, 1976) Takeuchi et al., 2015
- Type locality: Mount Shiritakayama, Itoigawa city, Niigata prefecture
- Coherent formation
- Early - Late Cretaceous
- Contemporaneous heterotopic facies: Uchiyama Formation
- Correlation: Akahageyama Formation
- Sedimentary facies: Terrestrial
- Lithofacies (Upper): Sandstone, Mudstone
- Lithofacies (Lower): Conglomerate
- Lithofacies (Lower, Minor): Sandstone, Mudstone
- Sedimentary structures (Upper): Graded bedding, Parallel stratification
- Sedimentary structures (Lower): Graded bedding, Cross stratification
- Thickness: 200 m
- Upper limit: Conformity (Oyashirazu Formation)
- Lower limit: Unconformity (Ultramafic rocks)
- Northern Itoigawa
- [ Upper ]
- ?--?--?--?--?-
- Oyashirazu Formation
- --------------
- Shiritakayama Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Shiritakayama - Agerogawa river - Mount Asaoyama, Itoigawa city, Niigata pref.; Daira - Sakaigawa river, Asahi city, Nimoniikawa county, Toyama pref.
- Fossils: Bivalves, 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