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Udatsuyama Formation (Mochizuki, 1930) Nirei, 1969

Invalid synonym: Kiya Formation

Some definitions treat this as a synonym of Hanyu Formation

• Type locality: Gosho town - Mount Udatsuyama, Kanazawa city, Ishikawa prefecture
• Coherent formation
• middle Pleistocene
• Correlation: Hanyu Formation

• Sedimentary facies: Lacustrine
• Lithofacies: Sands
• Lithofacies (Minor): Clay, Gravels
• Lithofacies (Basal): Gravels, Gravel-bearing sands
• Sedimentary structures (Lower): Cross stratfication
• Paleocurrent (Upper): to East, Northwest
• Paleocurrent (Lower): to West - Northwest - Southwest

• Thickness: ca. 70 - 170 m or thicker
• Upper limit: Unconformity (Unoke Terrace Deposits, Lower Terrace Deposits, Younger sand gravel bed)
• Lower limit: Conformity (Omma Sandstone Member), Unconformity (Iozen Formation, Himi Formation, Uryu Formation)

• Distribution: Gosho town - Mount Udatsuyama, Kanazawa city, Ishikawa pref.; Yochi - Uwadana - Kiya - Unoke - Wakamidori - Bodaiji - Yamashina - Kayama, Kahoku city, Ishikawa pref.; Menden - Morimoto, Hodatsushimizu city, Hakui county, Ishikawa pref.
• Fossils: Elephants (Parastegodon aurorae), Fish (Freshwater), Shellfishes, Plants, Diatoms (Freshwater)

• Tamura et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.1-20 DOI
• Sumi (1978) Geology of the Tsubata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 4p.)
• 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.)