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Hatatate Formation (Inai, 1939) Kitamura et al., 1986

It is named after Hatatate station of Akiu line or the locality name, Yamada-Hatatate.

Invalid synonym: Hatatate Siltstone and Sandstone Member, Hongo Sandstone and Shale Member

• Type locality: Along Tohoku expressway from Moniwa purification plant to Sahoyama, Taihaku-ku, Sendai city, Miyagi prefecture
• Coherent formation
• middle Miocene (13.0 - 11.0 Ma, Diatoms, Radiolarians, Calcareous nannofossils)

• Sedimentary facies: Marine
• Climate (Upper): Cooler
• Climate (Middle): Warm
• Depth of water (Upper): Shoreface (Benthic foraminifera)
• Depth of water (Middle): Bathyal (Benthic foraminifera)
• Depth of water (Lower): Shoreface (Benthic foraminifera)
• Lithofacies: Siltstone, Sandstone
• Lithofacies (Upper, Ht28-Ht32, Oso-23-Oso-31): Sandstone
• Lithofacies (Middle, Ht11-Ht28, Oso-3-Oso-28): Tuffaceous sandstone
• Lithofacies (Lower, Ht9-Ht11): Sandstone
• Lithofacies (Bottom, Ht8-Ht9): Grauconite-bearing sandstone

• Thickness (Overall): 180 - 200 m
• Thickness (Upper): 20 m
• Thickness (Middle): 100 - 120 m
• Thickness (Lower): 30 - 40 m
• Thickness (Bottom): 1.5 m
• Upper limit: Conformity, partly unconformity (Tsunaki Formation), Unconformity (Nashino Formation, Yumoto Formation)
• Lower limit: bottom of Ht8 Tuff Bed
• Lower limit: Conformity (Moniwa Formation)

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

• Distribution: Moniwa - Sahoyama - Nashino, Taihaku ward, Sendai city, Miyagi pref.; Kumanodo, Takadate, Natori city, Miyagi pref.
• Fossils: Crinoids (Needle), Sponges, Diatoms, Radiolarians, Ostracods, Calcareous nannofossils
• Fossils (Bivalves): Lucinoma actilineata, Macoma sp., Dentalium sp., Chlamys miyatokoensis, Miyagipecten matsumoriensis
• Fossils (Foraminifera): Ammonia hatatatensis, Ammonia cf. tochigiensis, Amphicoryna fukushimaensis, Amphicoryna pauciloculata, Anomalinoides glabrata, Astrononion cf. aomoriense, Astrononion cf. umbilicatulum, Baggina notoensis, Bolivina cf. dilatata, Bolivina aff. robusta, Brizalina himiensis, Buccella cf. tanaii, Buccella cf. tenerrima, Cancris auriculus, Cibicides asanoi, Cibicides lobatulus, Cibicides malloryi, Cibicides refulgens, Cibicides tani, Dentalina sp., Discorbinella convexa, Discorbitura sp., Ehrenbergina sp., Elphidium cf. fimbriatulum, Elphidium jenseni, Elphidium sendaiense, Elphidium cf. subarcticum, Epistominella pulchella, Evolvocassidulina sp., Fissurina cf. lucida, Fissurina marginata, Fissurina orbignyana, Gavelinopsis sp., Glabratella sp., Globigerina angustiumbilicata, Globigerina falconensis, Globigerina praebulloides praebulloides, Globigerinella praesiphonifera, Globigerinita glutinata, Globigerinoides immaturus, Globigerinoides subquadratus, Globigerinoides triloba, Globocassidulina cf. depressa, Globocassidulina oriangulata, Globorotalia conlinuosa, Globorotalia mayeri, Globorotalia menardii, Globorotalia miozea, Globorotalia rikuchuensis, Globorotalia siakensis, Globoquadrina debiscens, Guttulina asanoi, Guttulina austriaca, Guttulina sadoensis, Hanzawaia nipponica, Hanzawaia tagaensis, Heronallenia sp., Heterolepa sp., Islandiella cf. japonica, Islandiella margareta, Islandiella cf. yabei, Lagena apiopleura, Lagena laevis, Lagena sulcata spicata, Melonis cf. affinis, Melonis pompilioides, Neogloboquadrina sp., Nonion japonicus, Nonionella miocenica, Nonionellina sp., Oolina melo, Orbulina suturalis, Oridorsalis tener, Oridorsalis cf. umbonatus, Paracassidulina nipponensis, Plectofrondicularia miocenica, Pseudononion cf. japonicum, Pseudononion subcostatum, Pseudoparrella naraensis Pseudoparrella takayanagii, Pullenia bulloides, Pullenia salisburyi, Robulus cf. orbicularis, Rosalina australis, Sigmoidella pacifica, Sigmomorphina sp., Sphaeroidina japonica, Stilostomella sp., Trifarina hughesi, Triforina kokozuraensis, Uvigerina proboscidea
• Fossils (Diatoms): Amphora costata, Denticula sp.
• Tephra: Ht8 - Ht31, Oso-3 - Oso-31

• Miyamoto et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.27-46 DOI
• Fujiwara et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.96-119 DOI
• Kitamura et al. (1986) Geology of the Sendai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 134p. (in Japanese with English abstract 9p.)