Mitsuya Formation

Mitsuya Formation (Shimakura and Tsuchida, 1939) Ishii et al., 1982

Type locality: Kitakoizumi, Matsushima city, Miyagi county, Miyagi prefecture
Type locality (Invalid): Mitsuya, Yamoto, Higashimatsushima city, Miyagi prefecture
Coherent formation
Miocene

Lithofacies: Sandstone

Thickness: 280 m or thinner
Upper limit: Conformity (Shirasakayama Tuff Member), Unconformity (Kameoka Formation)
Lower limit: Unconformity (Middle Pumice Tuff Member, Upper Pumice Tuff Member, Siltstone Member, Tuffaceous Sandstone Sandy Siltstone Member, Diatomaceous Siltstone Member, Siltstone Sandstone Member, Neko Formation), Abut unconformity (Oido Formation)

Mitsuya Formation (Naruse river)
[ Upper ]
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Upper Member / Nemari Tuffaceous Sandstone Member
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Lower Member
~~~~~~~~~~~~~~
[ Lower ]

Shida Group (Matsushima, Miyagi pref.)
[ Upper ]
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Omatsuzawa Formation
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Bangamoriyama Formation
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Kashimadai Formation
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Hataya Formation
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Mitsuya Formation
~~~~~~~~~~~~~~
Neko Formation
~~~~~~~~~~~~~~
[ Lower ]

Shida Group (Sendai, Miyagi pref.)
[ Upper ]
~~~~~~~~~~~~~~
Nanakita Formation
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Aoso Formation
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Bangamoriyama Formation
~~~~~~~~~~~~~~
Irisugaya Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Kitakoizumi - Nemawari, Matsushima city, Miyagi county, Miyagi pref.; Mitsuya, Yamoto, Higashimatsushima city, Miyagi pref.
Fossils (Shellfishes): Acila (Acila) divaricata, Cryptonatica janthostomoides, Dentalium sp., Macoma incongrua, Macoma tokyoensis, Portlandsia (Portlandella) japonica
Fossils (Diatoms): Actinocyclus ingens, Actinocyclus ingens var. nodes, Actinoptychus undulatus, Biddulphia aurita, Biddulphia calamus, Cocconeis costata, Cocconeis scutellum, Coscinodiscus endoi, Coscinodiscus marginatus, Coscinodiscus symbolophorus, Coscinodiscus cfr. yabei, Denticulopsis hustedtii, Denticulopsis hyalina, Denticulopsis lauta, Denticulopsis nicobarica, Goniothecium rogersii, Grammatophora sp., Hemiaulus bipons, Himiaulus aff. polymorphus, Medialia splendida, Melosira sulcata, Navicula spp., Nitzschia challengeri, Pseudodimerogramma elegans, Pseudopodosira aff. hyalina, Rhizosolenia alata, Rhizosolenia miocenica, Rhizosolenia styliformis, Rossiella praepaleacea, Rouxia californica, Stephanogonita hanzawae, Stephanopyxis spp., Stictodiscus kittonianus, Synedra jouseana, Synedra miocenica, Thalassionema hirosakiensis, Thalassionema nitzschioides, Thalassiosira leptopus, Thalassiothrix longissima, Triceratium condecorum, Trochosira spinosa

Ishii et al. (1982) Geology of the Matsushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 121p. (in Japanese with English abstract 9p.)