Tenguharayama Formation

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Tenguharayama Formation Akahane, 1978

Type locality: Mount Tenguharayama - Otomiyama pass - Otari hot spring, Otari city, Kitaazumi county, Nagano prefecture
Volcanic rocks
Miocene
Interfingered: Otarionsen Formation

Sedimentary facies: Subaqueous
Lithofacies: Andesite - Basalt volcanic breccia, Tuff breccia
Lithofacies (Minor): Lapilli tuff, Pillow lava

Thickness: 950 m

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: Mount Tenguharayama - Otomiyama pass - Otari hot spring - Asaumigawa river, Otari city, Kitaazumi county, Nagano pref.

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.)