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Hatamura Formation Hatakeyama, 1954

• Type locality: Takase river - Ishizawa river, Hatamura - Okinadai, Yurihonjo city, Akita prefecture
• Volcanic rocks
• early Miocene
• Contemporaneous heterotopic facies: Aosawa Formation, Daisenyama Formation
• Contemporaneous heterotopic facies (Upper): Shimizubuchi Tuff Member, Zentoku Tuff Member
• Contemporaneous heterotopic facies (Middle): Takayakushiyama Andesite Member, Mashikozawa Welded Tuff Member, Taikura Basalt Member, Shimizubuchi Tuff Member
• Contemporaneous heterotopic facies (Lower): Ogura Welded Tuff Member, Takayakushiyama Andesite Member, Taikura Basalt Member
• Correlation: Daijima Formation
• Intruded by: Babame Dolerite, Zentoku Quartz Diorites, Dolerite

• Sedimentary facies: Terrestrial, Shallow marine
• Lithofacies (Main part): Acidic tuff, Lapilli tuff, Pyroxene andesite tuff, Lapilli tuff, Tuff breccia
• Lithofacies (Main part, Minor): Basalt lapilli tuff, Tuff, Rhyolite lava, Acidic welded tuff, Mudstone, Sandstone, Conglomerate, Lignite

• Thickness: 100 - 700 m
• Upper limit: Conformity partly unconformity (Sugota Formation)
• Lower limit: Conformity (Kanotsume Formation, Yashiozawakawa Formation, Sarakawa Formation), Conformity partly unconformity (Iizawa Formation)

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

• Distribution: Takase river - Ishizawa river, Hatamura - Okinadai, Yurihonjo city, Akita pref.; Nagaseno - Takinosawa - Mount Kuromori - Ogoya - Yukiyamata - Mitsukatamori - Numayama - Mount Sekine, Yurihonjo city, Akita pref.; Yashiozawa river - Mount Yashio, Yashima town, Yurihonjo city, Akita pref.; Susunai - Arasawadaira - Shimizubuchi - Aohira - Ogauchi, Chokai town, Yurihonjo city, Akita pref.; Karuizawa, Ugo city, Ogachi county, Akita pref.; Sugota - Kurobuchi - Oikata, Higashiyuri, Yurihonjo city, Akita pref.; Karuizawa - Kamitomai - Tashiro - Shimosendo - Iizawa - Mount Okuromori, Ugo city, Ogachi county, Akita pref.; Rendaiji - Hinokiyama, Yuzawa city, Akita pref.
• Fossils: Balnus, Silicified woods
• Fossils (Daijima-type flora): Acer macrosamarum, Alangium aequalifolium, Alnus miojaponica, Apocynophyllum sp., Betula sp., Brasenia sp., Carpinus shimizui, Carpinus stenophylla, Carpinus subjaponica, Carya miocathayensis, Castanea miomollissima, Celtis yuriensis, Comptonia naumanni, Cyclobalanopsis huziokai, Cyperacilis sp., Diospyros minor, Diospyros nordquisti, Dystylium cfr. racemosum, Glyptostrobus europaeus, Juglans shanwangensis, Liquidamber mioformosa, Liquidambar miosinica, Magnolia nipponica, Metasequoia occidentalis, Osmunda sp., Parrotia fagifolia, Pterocarya asymmetrosa, Quercus miovariariabilis, Salix sp., Sequoia langsdorfii, Torreya sp., Ulmus elegantior, Ulmus longifolia, Ulmus protoparvifolia, Viburnum sp., Zelkova ungeri

• Nishikawa et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.75-85 DOI
• Nakano and Tsuchiya (1992) Geology of the Chokaisan and Fukura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 138p. (in Japanese with English abstract 7p.)
• Ozawa et al. (1988) Geology of the Yashima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 87p. (in Japanese with English abstract 5p.)
• Ozawa et al. (1979) Geology of the Asamai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 53p. (in Japanese with English abstract 4p.)
• Ozawa et al. (1979) Geology of the Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 64p. (in Japanese with English abstract 4p.)
• Ozawa et al. (1977) Geology of the Honjo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 4p.)