Utsumi Formation

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Utsumi Formation Shibata, 1977

Invalid synonym: Utsumi Member

Type locality: Shokaiji temple, Minamichita city, Chita county, Aichi prefecture
Coherent formation
Miocene

Sedimentary facies: Marine
Lithofacies (Upper): Tuffaceous siltstone
Lithofacies: Interbedded sandstone and mudstone
Sedimentary structures (Lower): Slump structures

Thickness: ca. 70 m or thicker
Upper limit: Unconformity (Toyooka Formation, Terrace deposits)
Lower limit: Bottom of Nakiri Tuffaceous Sandstone
Lower limit: Conformity (Yamami Formation)

Utsumi Formation
[ Upper ]
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Upper part
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Okabe Tuffaceous Sandstone
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Lower part
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Nakiri Tuffaceous Sandstone
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[ Lower ]

Morozaki Group
[ Upper ]
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Utsumi Formation
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Yamami Formation
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Toyohama Formation
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Himaka Formation
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[ Lower ]

First Setouchi Supergroup (Aichi pref.)
[ Upper ]
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Morozaki Group
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[ Lower ]

[ Upper ]
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Second Setouchi Supergroup
?--?--?--?--?-
First Setouchi Supergroup
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[ Lower ]

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

Distribution: Shokaiji temple - Kusunoki - Utsufukuji - Utsumi - Onoura - Hosome, Minamichita city, Chita county, Aichi pref.
Fossils (Fishes): Congiidae, Diaphus sp., Engraulidae, Lampadena sp.
Fossils (Shellfishes): Carinineilo takeharai, Chlanidota mitsuganoensis, Ennucula cfr. osawanoensis, Macoma? sp., Laevidentalium sp., Limatula sp., Machaeroplax sp., Megasurcula cfr. osawanoensis, Microglyphis mitsuganoensis, Neilonella isensis, Nipponoscaphander sp., Palliolum (Delectopecten) peckhami, Periploma mitsuganoensis, Portlandia kakimii, Propeamussium tateiwai, Propebela takamiya ensis, Tectonatica ichishiana
Fossils (Foraminifera): Globigerina praebulloides, Globigerina venezuelana, Orbulina universa

Muramiya et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.11, pp.939-952 DOI
Kondo and Kimura (1987) Geology of the Morozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)