Rokugo Formation

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

Invalid synonym: upper Uchu Formation

Type locality: Rokugo, Otari city, Kitaazumi county, Nagano prefecture
Coherent formation
late Miocene

Lithofacies: Sandy mudstone
Lithofacies (Minor): Sandstone
Sedimentary structures: Parallel stratification, Bioturbation

Thickness: ca. 380 m
Upper limit: Conformity (Buno Formation)
Lower 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

Fossils: Plant fragments

Distribution: Rokugo, 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.)
Nakano et al. (2002) Geology of the Shiroumadake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 105p. (in Japanese with English abstract 5p.)