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Hanyu Formation (Ikebe, 1949)

Invalid synonym: Saida Formation

There is also a definition which contains Udatsuyama Formation.

• Type locality: Hanyu, Oyabe city, Toyama prefecture
• Coherent formation
• middle Pleistocene
• Correlation: Udatsuyama Formation

• Sedimentary facies: Brackish, Freshwater
• Sedimentary facies: Lacustrine, Tidal flat, Inner bay
• Lithofacies: Sands
• Lithofacies (Minor): Gravels, Mud, Interbedded sands and mud, Lignite
• Sedimentary structures: Cross stratification, Imbricate structure Graded bedding, Slump structures
• Paleocurrent: to North-northeast - Northwest
• Paleocurrent (Minor): to South - Southeast

• Thickness: ca. 10 - 250 m
• Upper limit: Unconformity (Kamitako Gravel and Clay, Kubo Sand, Nodera Gravel)
• Lower limit: Unconformity (Omma Sandstone Member, Itaya Sandstone and Siltstone Member, Yada Sandstone Member, Otogawa Formation, Yatsuo Group, Uryu Formation, Ota Formation, Hodatsusan Granite)

• Distribution: Hanyu - Isurugi - Sakura town, Oyabe city, Toyama pref.; Kamitako - Horita, Himi city, Toyama pref.; Iiyama town - Nakagawa town, Hakui city, Ishikawa pref.; Takono - Kawara - Mount Suemoriyama, Hodatsushimizu city, Hakui county, Ishikawa pref.; Wakamidori, Kahoku city, Ishikawa pref.; Ebizaka, Takaoka city, Toyama pref.
• Fossils: Foraminifera (Textularia articulata), Diatoms (Freshwater, Coscinodiscus sp.)
• Fossils (Shellfishes): Anisocorbula sp., Corbicula sp., Macoma sp., Nuttallia sp., Raeta yokohamensis, Veneridae, Viviparus sp.
• Fossils (Plants): Alnus japonica, Fagus microcarpa, Juglans manshurica var., Magnolia kobus, Patiurus nipponicus, Pinus thunbergii, Quercus serrata, Sapium sebiferum var., Styrax japonica, Thujopsis dolabrata, Trapa angusticerata, Tsuga cf. diuersifolia, Zanthoxyllum piperitum

• Tamura et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.1-20 DOI
• Sumi et al. (1989) Geology of the Isurugi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 118p. (in Japanese with English abstract 5p.)
• Imai et al. (1966) Geology of the Ochigata and Abugashima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 67p. (in Japanese with English abstract 4p.)
• Inoue et al. (1964) Johana, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 5p.)
• Sakamoto (1963) Toyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 6p.)
• Imai (1959) Kanazawa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 3p.)