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Tanokura Formation
- Coherent formation
- Miocene (11.1 - 9.4 Ma, K-Ar)
- Sedimentary facies: Marine
- Lithofacies: Diatomaceous mudstone
- Lithofacies (Minor): Tuff, Pumice tuff
- Lithofacies (Bottom): Sandstone (Hongo Sandstone Member)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hoshakuji, Takanezawa city, Shioya county, Tochigi pref.; Shimookamoto, Utsunomiya city, Tochigi pref.
- Fossils (Upper, Shiobara-Yama fauna): Cultellus izumoensis, Chlamys kaneharai, Mercenaria yokoyamai, Anadara cf. ninohensis, Cyclocardia cf. ochiaiensis, Lucinoma acutilineata, Mya cuneiformis
- Fossils (Middle): Acharax tokunagai, Lucinoma acutilineata
- Fossils (Diatoms, Hoshakuji): Actinocyclus ellipticus, Actinocyclus ingens f. ingens, Actinoptychus senarius, Azpitia endoi, Azpeitia nodulifera, Azpeitia vetustissima, Cavitatus jouseanus, Cocconeis costata, Coscinodiscus marginatus, Denticulopsis hustedtii, Denticulopsis simonsenii, Denticulopsis vulgaris, Diploneis bombus, Diploneis smithii, Goniothecium odontella, Grammatophora spp., Hemiaulus polymorphus, Hyalodiscus obsoletus, Ikebea tenuis, Melosira scopos, Melosira sol, Paralia sulcata, Plagiogramma staurophorum, Proboscia barboi, Rhizosolenia hebetata f. hiemalis, Rhizosolenia miocenica, Rhizosolenia styliformis, Stellarima microtrias, Stephanopyxis, Thalassionema hirosakiensis, Thalassionema nitzschioides, Thalassiosira brunii, Thalassiosira grunowii, Thalassiosira leptopus, Thalassiothrix longissima
- Matsui et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.89-102 DOI
- Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)
- Hayashi et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.3, pp.141-144 DOI