Suenomatuyama Formation

[ Top ] [ Japanese ]

Suenomatuyama Formation (Otuka, 1934) Hayakawa et al., 1954

Type locality: Namiuchi pass, Ninohe city - Ichinohe city, Ninohe county, Iwate prefecture
Coherent formation
middle Miocene (16.5- 15.0 Ma, Radiometric age)

Lithofacies: Tuffaceous sandstone

Thickness: 200 - 400 m or thicker
Upper limit: Unconformity (Zyumonzi Formation, Asanai Terrace Deposit, Kusagi Terrace Deposit)
Lower limit: Conformity, partly unconformity (Kadonosawa Formation), Conformity (Yotsuyaku Formation)

Suenomatuyama Formation
[ Upper ]
~~~~~~~~~~~~~~
Mainosawa Sandstone Member
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Aikawa Volcanic Rock Member / Nakuidake Volcanic Rock Member
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Itukamati Sandstone Member
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Anausi Conglomerate Member
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[ Lower ]

Shiratorigawa Group
[ Upper ]
~~~~~~~~~~~~~~
Suenomatuyama Formation
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Kadonosawa Formation
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Yotsuyaku Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Namiuchi pass, Ninohe city - Ichinohe city, Ninohe county, Iwate pref.; Anaushi - Oho cliff of Basen valley - Aikawa, Ninohe city, Iwate pref.; Jumonji river, Maisawa - Jumonji, Ninohe city, Iwate pref.
Fossils: shellfishes

Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)