Otarionsen Formation

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Otarionsen Formation (Tanaka et al., 1971) Nagamori et al., 2010

Type locality: Ottatezawa creek, Nakayagawa river, Otari city, Kitaazumi county, Nagano prefecture
Coherent formation
middle - late Miocene
Interfingered: Tenguharayama Formation

Lithofacies: Mudstone
Lithofacies (Minor): Sandstone, Turbidite sandstone
Sedimentary structures: Slump structures

Thickness: 800 m or thicker
Upper limit: Conformity (Nagasaki Formation)

Otari, Nagano pref.
[ Upper ]
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Mageshidani Formation
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Buno Formation
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Rokugo Formation
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Nagasaki Formation
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Tenguharayama Formation / Otarionsen Formation
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[ Lower ]

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

Distribution: Nakayagawa river, Otari city, Kitaazumi county, Nagano pref.
Fossils: Clupeidae (Scales), Shellfishes (Palliollum peckhami), Trace fossils (Tubes)

Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)