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Omma-Manganji fauna

• Type locality: Manganji, Yurihonjo city, Akita prefecture
• Type locality: Okuwa (old name is Omma), Kanazawa city, Akita prefecture
• Strata: Sunagomata Formation, Isodayama Formation, Togawa Formation, Sasaoka Formation, Maeyamagawa Formation, Usuizawa Formation, Nakawatari Formation, lower Sakekawa Formation, Asojima Formation, Uonuma Formation, Minagawa Formation, Tanihama Formation (Arimagawa Mudstone Member), Higashigawa Formation, Nechi Formation, Tomikura Formation, Ichinose Formation, Nigoriike Formation, Seguchi Formation, Mita Formation, Sakiyama Siltstone Member, Omma Sandstone Member
• Pliocene

• Climate: Cool-temperate, Intermediate-temperate
• Water temperature: Cold ocean current
• Depth of water: Shallow

• [ Index fossils ]
• Anadara amicula
• Chlamys cosibensis
• Chlamys tanassevitschi
• Yabepecten tokunagai
• Turritella saishuensis motidukii
• Neptunea eos
• Ophiodermella ogurana

• Amano et al., (2009) Jour. Geol. Soc. Japan, vol.115, no.11, pp.597-609.
• Amano et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.10, pp.516-531.
• Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.8, pp.389-404.
• 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.)
• Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)
• Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)
• Imai (1965) Koguchiseto, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 26p. (in Japanese with English abstract 4p.)