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Yatsuo Group (Makiyama, 1930) Nakajima et al., 2019

• Type locality: Toyama prefecture?
• Coherent formation
• early - late Miocene

• Sedimentary facies (Upper): Marine
• Sedimentary facies (Lower): Brackish
• Sedimentary facies (Upper): Inner bay
• Sedimentary facies (Lower): Shallow marine
• Sedimentary facies (Upper): Submarine fan
• Sedimentary facies (Lower): Transgressive deposits
• Sedimentary facies (Upper): Turbidite
• Climate: Tropical
• Lithofacies (Upper): Sandstone, Interbedded sandstone and mudstone
• Lithofacies (Middle): Tuff, Sandstone, Mudstone
• Lithofacies (Lower): Conglomerate, Sandstone

• Thickness: ca. 800 - 1,500 m
• Upper limit: Conformity, partly Unconformity (Otogawa Formation), Unconformity (Tonami Group, Himi Formation, Hanyu Formation)
• Lower limit: Unconformity (Nirehara Formation, Tetori Group, Anamizu Formation, Uryu Formation, Futomiyama Group)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Nirehara - Imozu - Iwaine, Osawano town, Toyama city, Toyama pref.; Jinzu river daisan dam, Yatsuo town, Toyama city, Toyama pref.; Mount Iozen, Toyama pref. - Ishikawa pref.; Kiya, Kahoku city, Ishikawa pref.
• Fossils: Elephants (Stegolophodon tsudai), Balanus sp., Sponges (Makiyama sp.), Bryozoans
• Fossils (Yatsuo-Kadonosawa fauna, Upper): Acila submirobilis, Amussium sp., Chlamys sp., Conus sp., Dentalium sp., Limopsis sp., Lucina sp., Lucinoma sp., Macoma sp., Natica janthostoma, Nucula sp., Ostrea sp., Palliorum sp., Pecten sp., Phaxus sp., Polinices sp., Portlandia thraciaeformis, Propeamussium tateiwai, Solemya sp., Tellina? sp., Teredo sp., Yoldia sp.
• Fossils (Yatsuo-Kadonosawa fauna, Middle - Lower): Acteocina sp., Acteon sp., Aequipecten yanagawaensis, Anadara daitokudoensis, Anadara kakehataensis, Anadara kurosedaniensis, Anisocorbula sp., Anomia sp., Asaphis sp., Astenotoma sp., Babylonia sp., Batillaria yamanarii, Bittium sp., Burusa sp., Callista sp., Calyotrea sp., Cardium? sp., Cerithidea miofluviatilis, Chicoreus tiganouranus, Chlamys nisataiensis, Clavus sp., Clementia sp., Conus sp., Corbicula sp., Crassatellites sp., Cyclina sp., Cymatium sp., Dentalium sp., Dosinia nagaii, Dosinia nomurai, Fobulina sp., Gari sp., Gibbula sp., Glycymeris sp., Inquistor sp., Joanisiella takeyamai, Latona sp., Limopsis sp., Littorinopsis miodelicatula, Lucinisca k-hataii, Macoma inconglura, Mactra sp., Meretrix sp., Mitrella sp., Murex sp., Myadolla crf. japonica, Mya japonica, Nassarius simizui, Natica sp., Nipponomarcia nakamurai, Olivella consoblina, Ostrea denslamellosa, Ostrea gravitesta, Patinopecten sp., Polinices sp., Propeamussium tateiwai, Protorotella yuantaniensis, Psammocola sp., Sangunolaria sp., Shiphonalia prespadicea, Silliquaria sp., Striarca sp., Stratoria sp., Syrnola sp., Tellina? sp., Teredo sp., Tiberia sp., Venericardia siogamaensis, Vicarya yokoyamai, Vicaryella notoensis
• Fossils (Foraminifera): Miogypsina sp., Operculina complanata

• Nakajima et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.7, pp.483-516 DOI
• Kunugiza et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.83-101 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.)
• Sumi (1978) Geology of the Tsubata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 4p.)
• Sumi and Nozawa (1973) Geology of the Uozu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (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 and Nozawa (1960) Yatsuo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 8p.)
• Nozawa and Sakamoto (1960) Gohyakkoku, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 10p.)
• 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.)