Yuzuritoge Formation

Yuzuritoge Formation (Suzuki and Yoshida, 1956)

Invalid synonym: Urushikubo Formation, Nishinosawa Mudstone Member

Type locality: Agano river, Urushikubo, Kitakata city, Fukushima prefecture
Type locality: Betsunochaya, Nishiaizu city, Yama county, Fukushima prefecture
Coherent formation
Forearc basin sediments
Miocene (13 - 10 Ma, Microfossils)
Correlation: upper Fuzawa Formation
Intruded by: Orthopyroxene clinopyroxene andesite

Sedimentary facies: Marine
Sedimentary facies: Pelagic
Lithofacies: Mudstone, Rhyolite pumiceous volcanic sandstone, Pumice lapilli tuff, Tuff
Sedimentary structures: Parallel stratification

Thickness: ca. 150 m
Upper limit: Conformity, partly unconformity (Shiotsubo Formation), Unconformity (Sunagohara Formation)
Lower limit: Conformity (Ninosawa Formation)

Mount Azuma, Fukushima pref.
[ Upper ]
--------------
Yuzuritoge Formation
--------------
Ninosawa Formation
--------------
Hibara Formation
--------------
Meganebashi Formation
~~~~~~~~~~~~~~
[ Lower ]

Miyashita, Fukushima pref.
[ Upper ]
--------------
Shiotsubo Formation
--------------
Yuzuritoge Formation
--------------
Ninosawa Formation
--------------
Higashiomata Formation
--------------
Kurakawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Agano river, Urushikubo, Kitakata city, Fukushima pref.; Betsunochaya, Nishiaizu city, Yama county, Fukushima pref.; Hosono pass, Kitashiobara city, Yama county, Fukushima pref.; Funehiki town, Tamura city, Fukushima pref.; Futamatagawa, Tenei city, Iwase county, Fukushima pref.; Matsuzawa, Aizumisato city, Onuma county, Fukushima pref.
Fossils: Shellfishes, Calcareous nannofossils, Radiolarians, Foraminifera

Furukawa et al. (2018) Geology of the Azuma Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 74p. (in Japanese with English abstract 3p.)
Yamamoto et al. (2006) Geology of the Kitakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 5p.)
Yamamoto and Komazawa (2004) Geology of the Miyashita District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 71p. (in Japanese with English abstract 5p.)
Yamamoto and Yoshioka (1992) Geology of the Wakamatsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 5p.)