Honya Formation

Honya Formation (Watanabe and Sato, 1937) Kubo et al., 2002

Invalid synonym: Honya Mudstone Member of Taira Formation, lower part of Taira Formation

Type locality: Honya, Izumi town, Iwaki city, Fukushima prefecture
Coherent formation
southern Yezo Forearc basin (Jobanoki basin)
early Miocene (Diatoms, Radiolarians)

Sedimentary facies: Marine
Sedimentary facies: Upper continental slope
Lithofacies: Siltstone
Lithofacies (Upper, Minor): Tuffaceous sandstone

Thickness: 150 - 220 m
Upper limit: Conformity (Misawa Formation), Unconformity (Minamishirado Formation)
Upper limit (West): Unconformity (Yoshinoya Formation)
Lower limit: Conformity (Kamenoo Formation)

Honya Formaiton
[ Upper ]
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Ishimoriyama Tuff Breccia Member
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[ Lower ]

Yunagaya Formation
[ Upper ]
~~~~~~~-------
Misawa Formation
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Honya Formation
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Kamenoo Formation
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Mizunoya Formation
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Goyasu Formation
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Kunugidaira Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Honya, Izumi town, Iwaki city, Fukushima pref.; Narukouchi, Naraha city, Futaba county, Fukushima pref.; Suetsugi, Hisanohama town, Iwaki city, Fukushima pref.; Mount Ishimori, Iwaki city, Fukushima pref.
Fossils: Plants (Myrica naumanni), Radilarians, Calcareous nannofossils, Foraminifera
Fossils (Shellfishes): Adulomya chitanii, Clementia iizukai, Conchocele bisecta, Macoma izurensis, Mya cuneiformis, Palliorum tairanum, Phaxas izumoensis, Solemya tokunagai, Venericardia cf. ferruginea
Fossils (Diatoms): Actinocyclus cf. ingens f. planus, Actinocyclus cf. octonarius, Actinoptychus senarius, Aulacoseira sp., Cavitatus linearis, Cestodiscus sp., Coscinodiscus marginatus, Coscinodiscus perforatus, Delphineis kamenooensis, Hyalodiscus obsoletus, Ikebea tenuis, Melosira scopos, Paralia sulcata, Rhizosolenia styliformis, Stellarima microtrias, Stephanopyxis spp., Thalassionema nitzschioides, Thalassiosira sp., Thalassiothrix longissima, Trochosira spinosa

Ando et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.49-67 DOI
Kubo et al. (2002) Geology of the Kawamae and Ide District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 136p. (in Japanese with English abstract 6p.)
Iwao and Matsui (1961) Taira and Kawamae, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 17p.)