Aoidani Mudstone Member

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Aoidani Mudstone Member

Type locality: Toyama prefecture
Coherent formation
Miocene
Contemporaneous heterotopic facies: Hirabayashi Sandstone Member

Lithofacies: Clayey siltstone, Sandy siltstone
Lithofacies (Minor): Tuff, Sandstone

Thickness: ca. 500 m
Upper limit: Unconformity (Hinomiya Gravel, Sand and Mud Alternation Member)
Lower limit: Conformity (Tenguyama Formation), Unconformity (Joyama Sandstone Member)

Otogawa Formation (Imizu, Toyama pref.)
[ Upper ]
~~~~~~~~~~~~~~
Aoidani Mudstone Member
--------------
[ Lower ]

Tonami Group
[ Upper ]
~~~~~~~~~~~~~~
Mita Formation
~~~~~~~~~~~~~~
Otogawa Formation
~~~~~~~~~~~~~~
Tenguyama Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Imizu hills - Yamadagawa river, Toyama city, Toyama pref.; Tsubono, Tonami city, Toyama pref.
Fossils: Plant fragments
Fossils (Shellfishes): Lucinoma sp., Thyasira sp., Turritella sp.
Tephra: O₁

Sakamoto (1963) Toyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 6p.)
Sakamoto and Nozawa (1960) Yatsuo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 8p.)