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Hiraiso Formation (Shiida, 1935) Ichikawa, 1947
Invalid synonym: Ojima Conglomerate and Sandstone Formation
- Sedimentary facies: Marine, Fluvial
- Sedimentary facies (Upper): Storm-dominated
- Sedimentary facies (Upper): Lower shoreface - Inner continental shelf
- Sedimentary facies (Middle): Braided river
- Sedimentary facies (Lower): Upper shoreface
- Sedimentary facies (Lower, Gravel-bearing sandstone): Sandbar deposit
- Sedimentary facies (Bottom): Fluvial
- Lithofacies (Upper): Interbedded calcareous sandstone and mudstone
- Lithofacies (Middle): Sandstone
- Lithofacies (Lower): Interbedded conglomerate and sandstone
- Lithofacies (Bottom): Conglomerate
- Lithofacies (Minor): Silty slate
- Sedimentary structures: Hummocky cross-stratification, Trough cross-stratification, Planar cross-stratification, Parallel-stratification, Trace fossils
- Paleocurrent: from West, Northwest, Southwest
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hiraiso seashore, Motoyoshi village, Kesennuma city, Miyagi pref.; Tanoura - Cape Tatezaki - Karashima island, Ishihama, Minamisanriku city, Motoyoshi county, Miyagi pref.; Mount Ota - Mount Omori, Ichioseki city, Iwate pref.; Kamihazawa - Shimohazawa - Hineushi, Toyma town, Tome city, Miyagi pref.; Komori - Sonae, Minamisanriku city, Motoyoshi county, Miyagi pref.; Murone, Ichinoseki city, Iwate pref.; Kiushi, Tsuyama town, Tome city, Miyagi pref.; Naburi - Mount Myojin - Mizuhama - Kojima - Mount Ishimine - Funato - Karakuwa - Wakehama - Namiita, Ogachi town, Ishinomaki city, Miyagi pref.; Cape Kamiwari - Kotaki - Ozashi, Kitakami town, Ishinomaki city, Miyagi pref.; Sakiyama, Ishinomaki city, Miyagi pref.; Matsushima, Shizukawa, Minamisanriku city, Hotoyoshi county, Miyagi pref.; Onmaehama, Onagawa city, Oshika county, Miyagi pref.
- Fossils: Amphibia (superfamily Capitosauroidea), Ammonoids (Glyptophiceras glacile), Nautiloids, Brachiopods (Orbiculoidea sp.), Crinoids, Sponges (Chaetetes sp.), Plants (Todites sp.)
- Fossils (Bivalves): Anodontophora aff. fassaensis, Anodontophora cf. ovalis, Avicula sp., Bakevellia cf. exporrecta, Bakevellia (Maizuria) cf. kambei, Cardium sp., Dentalium sp., Entolium discites, Entolium discites microtis, Entolium ussuricus, Eopecten ussuricus, Eumorphotis iwanowi, Gervilleia cf. exporrecta, Myalina sp., Myophoria aff. laevigata, Myophoria aff. ovata, Neoschizodus cf. laevugatus, Nuculopsis (Palaeonucula) spp., Palaeoneilo sp., Pecten cf. alberti, Pecten alberti virgalensis, Pecten cf. minimus, Pecten ussuricus, Pecten ussuricus sichoticus, Pleurophorus sp., Schizodus sp., Unionites aff. canalensis var. fassaensis(?), Wortheia? sp.
- Fossils (Limestone gravels): Crinoids, Blastoids, Chaetetes sp., Gnathodus commutatus commutatus, Hindeodella sp., Koninckophyllum? sp., Unispirifer? sp.
- Fossils (Trace fossils): Rhizocorallium isp.
- Ehiro and Morikiyo (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.47-67 DOI
- Takeuchi and Mikoshiba (2002) Geology of the Senmaya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 3p.)
- Takeuchi and Kaneko (1996) Geology of the Shizugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
- Kamada (1993) Geology of the Tsuya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)
- Kamada and Takizawa (1992) Geology of the Osu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 4p.)
- Takizawa et al. (1990) Geology of the Toyoma District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 126p. (in Japanese with English abstract 8p.)
- Takizawa et al. (1984) Geology of the Ishinomaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 7p.)
- Kambe and Shimazu (1961) Kesennuma, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 16p.)