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Sakiyama Formation Shimazu et al., 1970
- Type locality: Hideshima seashore, Sakiyama, Miyako city, Iwate prefecture
- Coherent formation
- Early Cretaceous, Albian (Ammonoids)
- Sedimentary facies: Marine
- Lithofacies (Upper): Silty sandstone, Sandstone
- Lithofacies (Lower): Silty sandstone, Sandy siltstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hideshima seashore, Sakiyama, Miyako city, Iwate pref.
- Fossils: Belemnoids (Neohibolites miyakoensis), Gastropods (Solarium incrassatum), Echinoids, Calcareous algae (Pterophyton miyakoense), Wood fragments, Teredo sp., Pipe rocks
- Fossils (Bivalves): Amphidonte (Ceratostreon) yabei, Astarte (Freistarte) subomdioides, Ostrea, Pectinella miyakoensis, Protocardia hiraigensis, Pterotrigonia hokkaidoana
- Urakawa et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.3, pp.121-130 DOI
- Shimazu et al. (1970) Geology of the Taro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 6p.)